# Indiana Office of Utility Consumer Counselor v. Duke Energy Indiana, LLC

> Indiana Supreme Court · December 19, 2024

URL: https://www.frixlaw.com/law-library/cases/10763943

## Case

- **Court:** Indiana Supreme Court
- **Decided:** December 19, 2024
- **Precedential status:** Published
- **Opinion:** Opinion
- **Cited by:** 0 later opinions in the Frix Law Library

## Citator (automated)

- No negative treatment found by the automated citator. That is not the same as a confirmation that the case is good law; read the citing cases.
- Full citator and citing cases: https://www.frixlaw.com/law-library/cases/10763943

## How later opinions describe it (automated extraction)

- holding that commission’s jurisdiction “is a legal question this Court reviews de novo”
- characterizing the “practical construction of a statute” by an agency as “influential” though “not controlling”
- noting “the Public Service Commission is purely an administrative or legislative body without judicial powers”
- applying a deferential standard but ultimately concluding that the agency’s interpretation of the statute was unreasonable

## Opinion text

FILED
Dec 19 2024, 2:05 pm

CLERK
Indiana Supreme Court
Court of Appeals
and Tax Court
IN THE

Indiana Supreme Court
Supreme Court Case No. 23S-EX-162

Indiana Office of Utility Consumer Counselor; Duke
Industrial Group; Nucor Steel–Indiana; Citizens
Action Coalition of Indiana, Inc.,
Appellants,

–v–

Duke Energy Indiana, LLC; Indiana Utility
Regulatory Commission,
Appellees.

Argued: September 28, 2023 | Decided: December 19, 2024
Appeal from the Indiana Utility Regulatory Commission
Cause No. 45647
On Petition to Transfer from the Indiana Court of Appeals
Case No. 22A-EX-1685

Opinion by Justice Slaughter
Justices Massa and Molter concur.
Chief Justice Rush concurs in the judgment.
Justice Molter concurs with separate opinion in which Chief Justice Rush joins.
Justice Goff concurs in the judgment with separate opinion.
Slaughter, Justice.

This case involves regulatory approval of a public utility’s proposed in-
frastructure improvements under the TDSIC statute—the transmission,
distribution, and storage improvement statute, Ind. Code ch. 8-1-39. This
statute permits utilities to recoup the costs of approved infrastructure im-
provements as they are completed. The Indiana Utility Regulatory Com-
mission found the TDSIC plan at issue here to be reasonable and ap-
proved all its proposed improvements. On appeal, the parties offer two ri-
val interpretations of the statute’s cost-justification section: whether each
improvement in the plan must be cost-justified, or whether all improve-
ments combined must be cost-justified. The commission says its order ap-
proving the plan was based on the latter interpretation. The court of ap-
peals, on judicial review, found this interpretation “reasonable” and ap-
plied a deferential standard of review to the commission’s order approv-
ing the plan.

We hold, first, that the scope of commission authority to approve a
TDSIC plan is a question of law, and that the panel erred in relying on Mo-
riarity v. Indiana Department of Natural Resources, 113 N.E.3d 614 (Ind.
2019), for its conclusion that a reviewing court’s statutory interpretation
begins and ends with agency deference. Rather than deferring to the com-
mission, we conduct a plenary review and hold, second, that the commis-
sion needed to include in its order a determination whether each of the
plan’s improvements is cost-justified. On this record, the commission
made the required determination, so we affirm.

I

A

Under traditional ratemaking, public utilities must first make improve-
ments to their infrastructure before they can recover their costs through
commission-approved rate increases to customers. NIPSCO Indus. Grp. v.
N. Ind. Pub. Serv. Co., 100 N.E.3d 234, 236 (Ind. 2018), modified on reh’g.
The process for recouping these costs, sometimes not until years after they
were incurred, is an expensive, onerous rate case, which involves a com-
prehensive, after-the-fact review of a utility’s entire business operations.

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 2 of 16
Ibid. In setting rates, the commission has broad authority to exclude ex-
penditures it deems unnecessary or excessive. I.C. § 8-1-2-48(a).

Unlike traditional ratemaking, the legislature through the TDSIC stat-
ute allows the commission to approve future expenses, 80 percent of
which the utility may then recover through periodic rate increases as it in-
curs these expenses. Id. § 8-1-39-9(a); NIPSCO Indus. Grp., 100 N.E.3d at
236–37, 239. The remaining 20 percent must be secured through an ordi-
nary rate case. I.C. § 8-1-39-9(c). If the commission approves a TDSIC plan,
the utility can periodically raise its rates automatically as it completes au-
thorized improvements. Id. § 8-1-39-9(a). Under the TDSIC statute, a util-
ity may request approval of a five-to-seven-year plan for eligible transmis-
sion, distribution, and storage improvements. Id. §§ 8-1-39-7.8, -10(a).
When seeking approval of a plan, a utility may also seek approval of tar-
geted economic-development projects. Id. § 8-1-39-10(a).

The commission must approve a utility’s proposed TDSIC plan if it de-
termines the plan is reasonable:

If the commission determines that the public utility’s TDSIC
plan is reasonable, the commission shall approve the plan
and authorize TDSIC treatment for the eligible transmission,
distribution, and storage improvements included in the
plan.

Id. § 8-1-39-10(b). En route to deciding a plan’s reasonableness, the com-
mission through its order must make one finding and two determinations:

The order must include the following:

(1) A finding of the best estimate of the cost of the eligible
improvements included in the plan.

(2) A determination whether public convenience and ne-
cessity require or will require the eligible improvements
included in the plan.

(3) A determination whether the estimated costs of the el-
igible improvements included in the plan are justified by
incremental benefits attributable to the plan.

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 3 of 16
Ibid. At issue here is the section 10(b)(3) determination: “whether the esti-
mated costs of the eligible improvements included in the plan are justified
by incremental benefits attributable to the plan.” Id. § 8-1-39-10(b)(3).

B

In 2021, Duke Energy Indiana, LLC, submitted a six-year TDSIC plan
for commission approval. Duke’s proposed plan costs $2.14 billion. Duke
wants to (1) improve its system’s reliability; (2) enhance the electrical
grid’s resistance to physical damage and ability to recover from adverse
events; (3) expand renewable energy and distributed generation, which re-
fers to generating electricity near where it will be used; and (4) bolster eco-
nomic development. The Indiana Office of Utility Consumer Counselor,
Duke Industrial Group, Citizens Action Coalition of Indiana, Inc., and Nu-
cor Steel–Indiana intervened at the commission and opposed Duke’s plan.

Before the commission, the parties disputed whether the estimated
costs of the eligible improvements included in the plan were “justified by
incremental benefits attributable to the plan” under section 10(b)(3). Duke
presented evidence that the plan will reduce the frequency of customer
outages by 17 percent and their duration by 19 percent. Duke also worked
with a consulting firm to quantify the value of each project and compute a
benefit-to-cost ratio. Projects with a benefit-to-cost ratio above 1.0, or a
positive return, have quantifiable benefits that outweigh the estimated
costs. Projects with a ratio below 1.0, or a negative return, have costs that
outweigh the benefits. Duke’s plan scored 2.8 overall with contingent ex-
penses excluded and 2.4 overall with contingent expenses included, while
increasing customers’ utility rates by one percent or less.

The industrial group objected, saying that Duke wants to pass on to
utility customers the costs of some individual projects that are not justified
by their corresponding benefits. While the benefit-to-cost ratio for Duke’s
whole plan is well above 1.0, the ratios for the plan’s individual projects
are mixed. For example, upgrading outdated four-kilovolt lines to twelve
kilovolts has a 0.6 ratio because the upgrades cost $67 million and yield
only $41 million in benefits. Depending on whether contingent expenses
are included, between 57 and 90 individual projects, according to the

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 4 of 16
industrial group, have a benefit-to-cost ratio less than 1.0—meaning they
are not cost-justified.

In response, Duke claims even its negative-return upgrades are neces-
sary because modern, self-optimizing grid systems help avoid outages
and better accommodate distributed energy generation. And Duke in-
cluded at least two net-negative projects in the plan because they will af-
fect critical customers. According to Duke, it can include these necessary
individual improvements in its TDSIC plan because the plan overall is
cost-justified.

The commission approved the plan and found that, under section
10(b)(3), the estimated improvements’ costs “are justified by the incremen-
tal benefits attributable to [the TDSIC plan].” It noted that the whole
plan—all projects combined—has a positive benefit-to-cost ratio, and
Duke’s analysis did not quantify all project benefits, meaning the benefits
side of the ledger is understated. For example, Duke chose 57 projects
without relying on a quantitative analysis, the commission found, “be-
cause they impact critical customers, such as hospitals and schools, and
enhance the grid with other benefits that were not quantified in the [bene-
fit-to-cost ratio] [a]nalysis.” Thus, the commission concluded, Duke’s plan
is reasonable.

The consumer counselor appealed, and the industrial group joined the
appeal. The consumer counselor, industrial group, Citizens Action Coali-
tion, and Nucor Steel are all parties to the appeal, Ind. Appellate Rule
17(A), but only the industrial group litigated the appeal. The industrial
group filed an appellate brief that no other appellant signed. And no other
appellant filed its own brief. On appeal, the industrial group challenged
the commission’s approval of Duke’s plan. Specifically, the industrial
group argued that Duke’s plan did not satisfy section 10(b)(3) because the
estimated costs of each improvement in the plan were not justified by the
incremental benefits attributable to the plan. In response, Duke and the
commission argued the plan meets section 10(b)(3) because the whole plan
is cost-justified, and thus the commission was entitled to approve the
plan. The industrial group also challenged the commission’s decision to
allow Duke to recover carrying costs on the deferred operating and

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 5 of 16
maintenance costs under Indiana Code section 8-1-39-9(c). And it chal-
lenged the commission’s failure to include specific findings in its order.

The court of appeals affirmed in a precedential opinion. Ind. Off. of Util.
Consumer Couns. v. Duke Energy Ind., LLC, 205 N.E.3d 1026 (Ind. Ct. App.
2023). It found the commission’s statutory interpretations to be reasonable
and thus “entitled to deference”. Id. at 1038, 1040 (citing Moriarity, 113
N.E.3d at 619). “[A]s such”, the panel continued, “we ‘stop our analysis
and need not move forward with any other proposed interpretation.’”
Ibid. (quoting Moriarity, 113 N.E.3d at 619). And the panel held that the
commission did not commit reversible error in “failing to make findings
that explicitly reject each of [the industrial group’s] arguments” before the
commission. Id. at 1041.

The industrial group then sought transfer, which we granted, 211
N.E.3d 1004 (Ind. 2023), thus vacating the appellate opinion, App. R.
58(A).

II

First, we address the applicable standard of judicial review for the
commission’s legal conclusions. What standard applies has been the sub-
ject of much debate because two recent cases from our Court point in dif-
ferent directions on the issue of judicial deference for questions of law.
Compare Ind. Off. of Util. Consumer Couns. v. S. Ind. Gas & Elec. Co., 200
N.E.3d 915, 919 (Ind. 2023) (“SIGECO”) (according no deference to com-
mission’s legal conclusions), with Moriarity, 113 N.E.3d at 621 (giving def-
erence to agency’s reasonable statutory interpretations). We hold that SI-
GECO, which demands plenary (de novo) review of legal questions, gov-
erns here. Moriarity, which obliges courts to accept an agency’s reasonable
interpretations of law, does not.

Second, applying plenary review, we hold that section 10(b)(3) re-
quires the commission to consider whether each improvement within a
TDSIC plan is cost-justified, and that the commission did what the statute
requires of it. And we summarily affirm, without further discussion, the
panel’s decision upholding the commission’s order allowing carrying

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 6 of 16
costs under section 9(c) and its decision rejecting the industrial group’s ar-
gument that the commission’s order lacked specific findings.

A

The panel below erred in deferring to the commission’s interpretation
of the TDSIC statute. Such deference contravenes our well-settled utility-
law precedent, which requires plenary review of the commission’s legal
conclusions. And we decline to extend Moriarity to the utility-law context.
The interpretive question before us, then, is not whether the commission’s
interpretation was reasonable, but whether it was right.

1

Our longstanding utility-law precedent holds that courts owe no defer-
ence to the commission’s legal conclusions, including, as relevant here, the
commission’s interpretation of utility-code provisions that define the
scope of its delegated powers. “[W]hen it comes to whether the commis-
sion acted within its legal guardrails—e.g., whether it acted within statu-
tory limits—we are presented with a ‘matter into which we may always
properly inquire.’” Ind. Off. of Util. Consumer Couns. v. Duke Energy Ind.,
LLC, 183 N.E.3d 266, 269 (Ind. 2022) (brackets and emphasis omitted)
(quoting Pub. Serv. Comm’n v. City of Indianapolis, 131 N.E.2d 308, 312 (Ind.
1956)); see also NIPSCO Indus. Grp., 100 N.E.3d at 241 (“Deciding the
scope of the Commission’s authority under the TDSIC Statute falls
squarely within our institutional charge.”); Ind. Bell Tel. Co. v. Ind. Util.
Regul. Comm’n, 715 N.E.2d 351, 354 (Ind. 1999) (holding that commission’s
jurisdiction “is a legal question this Court reviews de novo”); Citizens Ac-
tion Coal. v. N. Ind. Pub. Serv. Co., 485 N.E.2d 610, 612 (Ind. 1985) (“The
construction of Indiana law is particularly the province of this Court.”);
Pub. Serv. Comm’n v. City of La Porte, 193 N.E. 668, 670 (Ind. 1935) (noting
“the Public Service Commission is purely an administrative or legislative
body without judicial powers”).

The principles underlying this precedent apply with equal force today.
Reviewing issues of law is “not only within our prerogative and compe-
tence; it is our constitutional duty.” Ind. Off. of Util. Consumer Couns., 183
N.E.3d at 269; Ind. Const. art. 3, § 1; id. art. 7, § 1. We have an “inherent

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 7 of 16
‘duty to act as the final and ultimate authority’ in pronouncing Indiana
law.” A.A. v. Eskenazi Health/Midtown CMHC, 97 N.E.3d 606, 610 n.1 (Ind.
2018) (quoting Troue v. Marker, 252 N.E.2d 800, 803 (Ind. 1969) (noting this
Court’s “inherent constitutional duty” to decide questions of state law)).
Thus, while we defer to the commission’s technical expertise, we cannot
defer to its conclusions of law. Ind. Off. of Util. Consumer Couns., 183
N.E.3d at 269. Otherwise, we would cede our core judicial function—the
duty to say what the law is—to an administrative agency within the exec-
utive branch.

Despite this precedent, the panel below relied on Moriarity—a non-util-
ity case—to defer to the commission’s interpretation of the TDSIC statute.
Ind. Off. of Util. Consumer Couns., 205 N.E.3d at 1038, 1040 (citing Moriarity,
113 N.E.3d at 619). But that case is inapt. Moriarity arose under AOPA, the
Administrative Orders and Procedures Act, I.C. art. 4-21.5, and the com-
mission is not an AOPA agency, id. § 4-21.5-2-4(a)(8). Even on its own
terms, Moriarity did not purport to govern non-AOPA agencies like the
commission. “With AOPA in mind,” the Court announced and applied a
deferential standard of judicial review to the Indiana Department of Natu-
ral Resources, an AOPA agency. Moriarity, 113 N.E.3d at 618–19.

Just this year, the legislature enacted major administrative-law reforms,
declaring, among other things, that a court must decide legal questions
“without deference” to interpretations by an AOPA agency: “The court
shall decide all questions of law, including any interpretation of a federal
or state constitutional provision, state statute, or agency rule, without def-
erence to any previous interpretation made by the agency.” Pub. L. No.
128-2024, § 12, 2024 Ind. Acts 1937, 1948 (adding I.C. § 4-21.5-5-11(b) (ef-
fective July 1, 2024)). This enactment does not merely prune Moriarity def-
erence but uproots it. In a future case, we may need to grapple with the
continuing vitality of Moriarity and the AOPA precedent on which it re-
lies. But for now, the issue before us is merely whether the court of ap-
peals was right to rely on Moriarity for its view that deference to the com-
mission is warranted here. We hold it was not.

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 8 of 16
2

Despite our settled utility-law precedent detailed above, supra, at 7–8,
one of our concurring colleagues believes we should ignore this precedent
and apply Moriarity here. Post, at 3–7 (Goff, J., concurring in judgment).
Extending Moriarity would contravene our utility-law precedent, and that
includes NIPSCO Industrial Group, our most closely analogous precedent,
which involved judicial review of a TDSIC ruling by the commission. 100
N.E.3d at 237. The concurrence, for its part, does not mention NIPSCO In-
dustrial Group at all. Post, at 3–7 (Goff, J., concurring in judgment). There
we minced no words in our unanimous holding that courts owe “no def-
erence” to the commission’s legal conclusions, and that our review of such
conclusions is “plenary”:

We review questions of law de novo and accord the adminis-
trative tribunal below no deference. To do otherwise would ab-
dicate our duty to say what the law is. Such plenary review is
constitutionally preserved for the judiciary and considers
whether the disputed decision, ruling or order is contrary to
law. Such legal questions are for the courts to resolve and turn
on whether the Commission stayed within its jurisdiction and
conformed to the statutory standards and legal principles in-
volved in producing its decision, ruling, or order.

NIPSCO Indus. Grp., 100 N.E.3d at 241 (citations and internal quotation
marks omitted). NIPSCO Industrial Group did not till new soil. It was a
mainstream, middle-of-the-road decision joined by all five members of the
Court, including the four Justices who remain on today’s Court. Today’s
decision merely follows suit.

The “respectful consideration”, post, at 3 (Goff, J., concurring in judg-
ment) (quoting City of Indianapolis v. Ritzinger, 56 N.E. 141, 143 (Ind. App.
1900)), our early cases gave agency decisions does not stray from NIPSCO
Industrial Group or our approach today. As we observed 160 years ago, the
interpretation of law by “administrative officers” is “entitled to respectful
consideration, but it is no binding interpretation”. Ristine v. State, 20 Ind.
328, 337 (1863). And 75 years later, we said: “The interpretation put upon

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 9 of 16
legislation by administrative officers is not controlling, but is often influ-
ential and persuasive.” State ex rel. Middleton v. Scott Cir. Ct. of Scott Cnty.,
17 N.E.2d 464, 467 (Ind. 1938). This principle of “respectful consideration”
does not require courts to defer to an agency’s reasonable interpretation of
a statute. The judiciary is anything but independent if proper “respect” for
a coordinate branch amounts to a surrender to its legal pronouncements.

We said as much in NIPSCO Industrial Group when discussing our re-
spective utility-law functions: “Crafting our State’s utility law is for the
legislature; implementing it is for the executive acting through the Com-
mission; and interpreting it is for the courts.” 100 N.E.3d at 241. As a court
of last resort, we no more overstep our role, post, at 7 (Goff, J., concurring
in judgment) (citing Loper Bright Enters. v. Raimondo, 144 S. Ct. 2244, 2295
(2024) (Kagan, J., dissenting)), when we interpret the law authoritatively
in the cases that come before us than the general assembly oversteps its
role when it establishes public policy through its lawmaking, or the gover-
nor oversteps his role when he takes care that the laws are faithfully exe-
cuted. Under our constitution, that is what we do, and it does, and he
does.

3

At issue today is the meaning of section 10(b)(3): “whether the esti-
mated costs of the eligible improvements included in [a TDSIC] plan are
justified by incremental benefits attributable to the plan.” I.C. § 8-1-39-
10(b)(3). What this statute means is purely a legal question: how broadly
or narrowly has the legislature set the guardrails for the commission to ex-
ercise its authority to approve TDSIC plans? No one doubts the commis-
sion must follow the statutory requirements in section 10(b). Deciding
where, exactly, the legislature has defined the boundaries for the commis-
sion to approve TDSIC plans is quintessentially a question of law for
courts. Executive officials do not get to decide the limits of their own
power. The issue for us, then, is not whether the commission’s interpreta-
tion of this statute was reasonable but whether it was right. See N. Ind.
Pub. Serv. Co. v. U.S. Steel Corp., 907 N.E.2d 1012, 1018 (Ind. 2009) (noting
that “legal propositions are reviewed for their correctness”) (citation omit-
ted).

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 10 of 16
B

Having determined that we owe the commission’s interpretation of
section 10(b)(3) no deference, we interpret the statute independently and
settle on the meaning that is best. We do not put our thumb on the scale
either for or against the commission’s determination. We give its determi-
nation whatever persuasive weight its legal analysis merits—no more, no
less. We hold that section 10(b)(3) requires the commission to determine
whether the individual improvements within a TDSIC plan are cost-justi-
fied, and we are satisfied the commission made the required determina-
tion here.

1

When approving a public utility’s TDSIC plan, the commission must
issue an order that includes several requirements, the last of which is at is-
sue here:

A determination whether the estimated costs of the eligible
improvements included in the plan are justified by incre-
mental benefits attributable to the plan.

I.C. § 8-1-39-10(b)(3). While the commission’s order must include a deter-
mination about cost-justification, the only conclusion required for ap-
proval is that the plan be “reasonable”. Id. § 8-1-39-10(b). The question be-
fore us, in other words, is not what the commission must conclude but
what its order must include. The order must include, among other things,
the required section 10(b)(3) determination.

The disputed section is not a model of draftsmanship. If, as the indus-
trial group maintains, the legislature wanted the commission’s cost-justifi-
cation determination to be made on an improvement-by-improvement ba-
sis, it could have said as much:

A determination whether the estimated cost of each eligible
improvement included in the plan is justified by the benefits
attributable to each such improvement.

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 11 of 16
And if the legislature wanted this determination to be made on a plan-
wide basis, as Duke and the commission urge, it likewise could have said
so more clearly:

A determination whether the estimated costs of the plan are
justified by the overall benefits attributable to the plan.

Of course, we cannot rewrite the statute before us; we must interpret as
best we can the statute the legislature wrote.

The enacted statute has four key terms relevant here: the commission’s
order must determine whether “estimated costs” of the “eligible improve-
ments” included in the plan are justified by “incremental benefits” that are
“attributable to the plan.” Id. § 8-1-39-10(b)(3). A few things about this
statute are straightforward:

• The commission must consider the estimated costs of a plan’s eligi-
ble improvements.
• It must consider the plan’s incremental benefits.
• And it must determine whether the plan’s incremental benefits jus-
tify the improvements’ estimated costs.

So far, so good. But two things remain unclear:

• Does “estimated costs” of a plan’s “eligible improvements” mean
the commission must consider the estimated costs of each improve-
ment in the plan or of all improvements together?
• Does “incremental benefits attributable to the plan” mean the com-
mission must consider the benefits of each improvement in the plan
or the whole plan’s benefits?

We conclude the most natural reading of the statute requires the commis-
sion to determine whether a plan’s individual improvements are cost-jus-
tified.

Adopting the contrary, whole-plan approach would effectively read
out of the statute both “eligible improvements” and “incremental”, as if
the statute said: “whether the estimated costs of the eligible improvements
included in the plan are justified by incremental benefits attributable to
the plan.” “[E]ligible improvements” connotes an analysis of each

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 12 of 16
improvement, not the entire plan. If the legislature wanted to refer to the
costs of the whole plan, it would have no need to specify a plan’s “eligible
improvements”. And “incremental” refers to parts within a whole, mean-
ing “incremental benefits” must be the benefits of each improvement.
“Under our surplusage canon, courts should give effect to every word and
‘eschew those interpretations that treat some words as duplicative or
meaningless.’” Cutchin v. Beard, 171 N.E.3d 991, 997 (Ind. 2021) (brackets
omitted) (quoting Estabrook v. Mazak Corp., 140 N.E.3d 830, 836 (Ind.
2020)). The best way to interpret this (and any) statute is to give effect to
all its terms. We hold that section 10(b)(3) requires the commission to de-
termine whether the “eligible improvements” are justified by the “incre-
mental benefits”, not whether the plan’s total costs are justified by the
plan’s total benefits.

To counter this conclusion, Duke contrasts section 10(b)(3) with an-
other TDSIC provision requiring an improvement-specific cost-justifica-
tion determination for new improvements added to the initial plan in a
later proceeding. Duke argues that the legislature knows how to require
that the commission consider whether costs of a specific set of improve-
ments are justified by the benefits attributable to that same set of improve-
ments. Section 12(d)(3), Duke observes, does just that. It directs the com-
mission to determine “whether the estimated costs of the new projects or
improvements are justified by incremental benefits attributable to the
new projects or improvements.” I.C. § 8-1-39-12(d)(3) (emphasis added).
This difference between sections 10(b)(3) and 12(d)(3), according to Duke,
warrants interpreting them differently. The latter requires comparing the
benefits and costs of the new projects or improvements. The former, Duke
says, requires comparing the costs of a proposed plan’s eligible improve-
ments with the benefits attributable to the plan.

We see things differently. We view section 12(d)(3) as not undermining
our interpretation of section 10(b)(3) but reinforcing it. Section 12(d)(3)
merely repeats for newly added projects the same determination neces-
sary to approve a plan at the outset. The only difference between the two
statutes is that section 12(d)(3) substitutes “new projects or improve-
ments” for “eligible improvements included in the plan”. The best inter-
pretation of both statutes is that the same standard applies; the

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 13 of 16
commission’s order must determine whether the requested improvements
are cost-justified on an “incremental”, improvement-by-improvement ba-
sis.

To be clear, our holding today decides only what the commission must
include in its order, not whether the commission may approve a TDSIC
plan. The commission must approve a plan if it determines the plan is rea-
sonable. Id. § 8-1-39-10(b). And the commission determines reasonableness
based on the three section 10(b) considerations including, as relevant here,
the section 10(b)(3) determination whether the plan’s individual improve-
ments are cost-justified. Whether the plan is reasonable is a mixed ques-
tion of law and fact. That determination is subject to the commission’s
considerable discretion and will be overturned only if its reasonableness
determination is itself unreasonable. Ind. Off. of Util. Consumer Couns., 183
N.E.3d at 268.

If some improvements in the plan have high costs with comparatively
low benefits, the commission might determine those improvements make
the plan unreasonable overall. The flip side is that some individual im-
provements may not themselves be cost-justified, yet the plan overall may
still be reasonable if the commission determines those improvements are
important enough to the plan and their costs are justified relative to their
benefits.

2

Given our interpretation of section 10(b)(3), we hold that the commis-
sion’s order made the required determination that the plan’s individual
projects are cost-justified. The commission did not recite benefit-to-cost ra-
tios for each project within Duke’s plan, but it did not have to. After find-
ing that the whole plan inclusive of all projects had a net positive benefit-
to-cost ratio, the commission considered those projects the industrial
group claims are not cost-justified. While Duke “identified 57 projects that
were not selected through the [benefit-to-cost analysis]”, the commission
noted, it included these projects “because they impact critical customers,
such as hospitals and schools, and enhance the grid with other benefits
that were not quantified”. By considering the non-quantified benefits of
these 57 projects, the commission conducted the required analysis of the

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 14 of 16
plan’s proposed improvements. Based on that analysis, the commission
concluded that the plan is reasonable and that “the estimated costs of [the
plan’s] projects are justified by the incremental benefits attributable to [the
plan].” These determinations are supported by the record, and they track
what the statute requires of the commission to approve a TDSIC plan.

* * *

For these reasons, we affirm the commission’s order.

Massa and Molter, JJ., concur.
Rush, C.J., concurs in the judgment.
Molter, J., concurs with separate opinion in which Rush, C.J., joins.
Goff, J., concurs in the judgment with separate opinion.

ATTORNEYS FOR APPELLANT DUKE INDUSTRIAL GROUP
Todd A. Richardson
Joseph P. Rompala
Tabitha L. Balzer
Aaron A. Schmoll
Lewis Kappes, P.C.
Indianapolis, Indiana

ATTORNEY FOR APPELLANT CITIZENS ACTION COALITION OF
INDIANA, INC.
Jennifer A. Washburn
Indianapolis, Indiana

ATTORNEY FOR APPELLANT INDIANA OFFICE OF UTILITY CON-
SUMER COUNSELOR
William Irwin Fine
Indiana Office of Utility Consumer Counselor
Indianapolis, Indiana

ATTORNEY FOR APPELLANT NUCOR STEEL – INDIANA
Anne E. Becker
Lewis Kappes, P.C.
Indianapolis, Indiana

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 15 of 16
ATTORNEYS FOR APPELLEE DUKE ENERGY INDIANA, LLC
Andrew J. Wells
Elizabeth A. Heneghan
Duke Energy Business Services LLC
Plainfield, Indiana

Peter J. Rusthoven
Nicholas K. Kile
Lauren M. Box
Kian J. Hudson
Barnes & Thornburg LLP
Indianapolis, Indiana

ATTORNEYS FOR APPELLEE INDIANA UTILITY REGULATORY
COMMISSION
Theodore E. Rokita
Attorney General of Indiana

Benjamin Jones
Office of the Attorney General
Indianapolis, Indiana

Beth E. Heline
Jeremy Comeau
Bradford Hines
Indiana Utility Regulatory Commission
Indianapolis, Indiana

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 16 of 16
Molter, J., concurring.

I write separately to note three observations.

First, holding that we undertake de novo review of the Indiana Utility
Regulatory Commission’s interpretation of the TDSIC Statute does not
break any new ground. See, e.g., Indiana Off. of Util. Consumer Couns. v. S.
Indiana Gas & Elec. Co., 200 N.E.3d 915, 919 (Ind. 2023) (“The controlling
question at issue is one of law, on which we owe the Commission no
deference.”). Our most recent decision reviewing the Commission’s
interpretation of the TDSIC Statute was NIPSCO Industrial Group v.
Northern Indiana Public Service Co., 100 N.E.3d 234 (Ind. 2018). The question
in that case was whether the Commission correctly interpreted the statute
to mean the Commission could pre-approve costs within broad
parameters for identifying future improvements without designating
those improvements with specificity. Id. at 236–37. And our Court was
unanimous in (1) holding that our review of the Commission’s statutory
interpretation was de novo;1 (2) holding that the Commission’s
interpretation was incorrect;2 and (3) reversing the Commission’s order
preapproving roughly $20 million in infrastructure improvements. 3

Second, while we do not defer to the Commission’s statutory
interpretation, we still “defer[] to agency expertise.” Post, at 4; accord ante
at 8 (acknowledging that “we defer to the commission’s technical
expertise”). Earlier this year, for example, we deferred to the

1 Id. at 241 (explaining that we “review questions of law de novo” and that there is no “‘tie-

goes-to-the-agency’ standard for reviewing administrative decisions on questions of law”); see
also id. (“Crafting our State’s utility law is for the legislature; implementing it is for the
executive acting through the Commission; and interpreting it is for the courts.”).
2Id. at 242 (“We conclude the TDSIC Statute does not apply to project categories or multiple-
unit projects described using ascertainable criteria. . . . The Commission erred when it
authorized multiple-unit-project categories in a Section 10 proceeding and approved
NIPSCO's later specification of projects under Section 9.”).
3Id. at 237 (“At issue here is the Indiana Utility Regulatory Commission’s preapproval of
approximately $20 million in infrastructure investments . . . .”); id. at 245 (“We reverse the
portions of the Commission’s TDSIC–4 Order that approved previously unspecified
improvements.”).

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 1 of 2
Commission’s technical expertise when we upheld its determination that
local ordinances requiring underground relocation of public utility
facilities were unreasonable. City of Carmel v. Duke Energy Indiana, LLC, 234
N.E.3d 816, 822 (Ind. 2024) (“Because of its expertise, the Commission is in
the best position to determine whether costs are reasonable and whether
costs would shift to customers statewide.”). In that same case, we held
that the Commission is a proper party on appeal, explaining that one
reason we reached that conclusion was that “[w]ithout the Commission’s
participation on appeal, Indiana appellate courts would lose the benefit of
the Commission’s expertise.” Id. at 821.

We continue that deference to the Commission’s technical expertise
today. As the Court explains, the TDSIC Statute tasks the Commission
with determining whether a TDSIC plan is “reasonable,” which “is a
mixed question of law and fact . . . subject to the commission’s
considerable discretion,” and we will only overturn that decision if the
Commission’s reasonableness determination is itself unreasonable. Ante,
at 14. The Court is unanimous in deferring to the Commission’s
reasonableness determination here and affirming its order.

Third, it is not the Court that has overruled the guidance in Moriarity v.
Indiana Department of Natural Resources, 113 N.E.3d 614 (Ind. 2019),
interpreting AOPA as requiring courts to defer to administrative agencies’
statutory interpretations. The General Assembly has since amended
AOPA, directing courts to instead review those questions de novo. Ind.
Code § 4-21.5-5-11(b) (“The court shall decide all questions of law,
including any interpretation of a federal or state constitutional provision,
state statute, or agency rule, without deference to any previous
interpretation made by the agency.”).

Rush, C.J., joins.

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 2 of 2
Goff, J., concurring in the judgment.

The Court today reaches two holdings: (1) that, because the scope of
IURC authority to approve a TDSIC plan is a question of law, resolution of
this case requires plenary review of the applicable regulatory statute; and
(2) the applicable statute requires the IURC to include in its order a
determination whether each of the plan’s improvements is cost-justified.

I agree with the Court that the IURC ultimately satisfied its statutory
obligation, but I part ways with the Court on how it reached that decision.
In my view, there’s no need to depart from our well-settled standard of
review, which holds the “interpretation of a statute by an administrative
agency charged with the duty of enforcing the statute,” though not
binding, “is entitled to great weight, unless this interpretation would be
inconsistent with the statute itself.” Moriarity v. Ind. Dep’t of Nat. Res., 113
N.E.3d 614, 619 (Ind. 2019) (cleaned up); accord Jay Classroom Teachers Ass’n
v. Jay Sch. Corp., 55 N.E.3d 813, 816 (Ind. 2016); West v. Off. of Ind. Sec’y of
State, 54 N.E.3d 349, 353 (Ind. 2016); Util. Ctr., Inc. v. City of Fort Wayne, 868
N.E.2d 453, 458 (Ind. 2007); Pub. Serv. Comm’n of Ind. v. City of Indianapolis,
235 Ind. 70, 79, 131 N.E.2d 308, 311 (1956); Zoercher v. Ind. Associated Tel.
Corp., 211 Ind. 447, 456, 7 N.E.2d 282, 286 (1937); Citizens’ Tr. & Sav. Bank of
S. Bend v. Fletcher Am. Co., 207 Ind. 328, 334, 192 N.E. 451, 452 (1934); In re
Nw. Ind. Tel. Co., 201 Ind. 667, 674, 171 N.E. 65, 67 (1930); State Bd. of Tax
Comm’rs v. Holliday, 150 Ind. 216, 230, 49 N.E. 14, 18 (1898). For this reason,
and because I find the IURC’s whole-plan interpretation to be reasonable,
I concur only in the Court’s judgment.

I. The Court’s plenary review of regulatory statutes
strays from well-settled precedent.
Hoosiers today live in a society of rapid technological, economic, and
social change. The pace of this reform is such that problems often emerge
before the government can gather the necessary information, study the
issue, and respond with corrective action. It makes sense, then, for
lawmakers to delegate authority to those agencies equipped with the
necessary resources and expertise to timely respond to society’s

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 1 of 11
emerging—and constantly evolving—problems. Accordingly, our General
Assembly will often enact legislation directing the various state agencies
to adopt “such rules and regulations” as those agencies deem necessary to
carry out their duties. This authority extends to nearly every facet of our
lives—from the regulation of timber sales, collection agencies, and
alcoholic beverage advertising, to the licensing and registration of
radiation sources and the protection and preservation of ports, and even
to the enforcement of our public-utility laws.1

At the same time, regulatory statutes such as these often contain certain
ambiguities and gaps. What, for example, qualifies as a “stream” under
the Dam Safety Act for purposes of giving the DNR jurisdiction over dams
“in, on, or along the rivers, streams, and lakes of Indiana”?2 Alternatively,
how does one determine whether a “stream or regulated drain” in Indiana
is “ten (10) miles or less” in length for purposes of allowing construction
or excavation within a floodway? Does the proper measurement extend
“from the stream or drain’s headwater to its mouth” or from some other
point?3 Or let’s consider medical benefits. The state’s Medicaid program
considers a person eligible when the disability from which they suffer
“appears reasonably certain” to continue for a period “without significant
improvement.” But does a person suffer from a “disability” when his or
her “conditions may improve with treatment, even though they are too
poor to pay for treatment”?4

The questions that arise from these statutory ambiguities may have
been intentionally designed—the legislature having entrusted the agency
and its regulatory experts to administer the more technical aspects of the
legislative scheme. Alternatively, the statutory uncertainty may reflect

1See Ind. Code § 25-36.5-1-9 (timber); I.C. § 8-10-1-9 (ports); I.C. § 25-11-1-8 (collection
agencies); I.C. § 10-19-12-5 (radiation); I.C. § 7.1-2-3-16 (alcoholic beverage ads); I.C. § 8-1-2-
115 (utility-law enforcement).
2 See Moriarity, 113 N.E.3d at 620 (quoting I.C. § 14-27-7.5-8(a)(1)).
3 See Nat. Res. Comm’n of Ind. Dep’t of Nat. Res. v. Porter Cnty. Drainage Bd., 576 N.E.2d 587, 588
(Ind. 1991) (quoting I.C. § 13-2-22-13(d)(C)(1) (repealed)).
4 See Sullivan v. Day, 681 N.E.2d 713, 715–16 (Ind. 1997) (quoting I.C. § 12-14-15-1(2)).

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 2 of 11
careless drafting, or it may simply indicate the limits of legislative
foresight into issues that arose years after enactment. Whatever the reason
for the imprecision, the uncertainty requires resolution. The question is by
whom?

A. Long-standing precedent calls for judicial deference to
agency decisions that fall within their unique sphere of
expertise.
For well over a century, Indiana courts have answered this question by
deferring to state agencies, showing “respectful consideration” to “the
construction given the statute by those charged with the duty of executing
it.” City of Indianapolis v. Ritzinger, 24 Ind. App. 65, 72, 56 N.E. 141, 143
(1900) (citation and quotation marks omitted). Of course, the precise
standard has varied over the years. See, e.g., Holliday, 150 Ind. at 230, 49
N.E. at 18 (agency interpretations are “entitled to great respect”); Citizens’
Tr., 207 Ind. at 334, 192 N.E. at 452 (giving due “consideration” to a state
agency’s construction of a statute when its words “are of doubtful
import”); Zoercher, 211 Ind. at 456, 7 N.E.2d at 286 (characterizing the
“practical construction of a statute” by an agency as “influential” though
“not controlling”). But whatever the language used, the principle of
judicial deference to agency interpretations of the law has remained
constant. That principle, as expressed in modern terms, holds that the
“interpretation of a statute by an administrative agency charged with the
duty of enforcing the statute,” though not binding, “is entitled to great
weight, unless this interpretation would be inconsistent with the statute
itself.” Moriarity, 113 N.E.3d at 619 (cleaned up).

And there are good reasons to adhere to this general rule.

For one, regulatory statutes often implicate scientific or highly technical
subject matter. As a “body composed of a personnel especially qualified
by knowledge, training, and experience pertaining to the subject–matter
committed to it” by the legislature, an administrative agency is well suited
to “conscientiously and impartially” administer these statutes. In re Nw.
Ind. Tel. Co., 201 Ind. at 674, 171 N.E. at 68. So, when “the legislature has

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 3 of 11
created” an administrative “body of experts,” the “decision or findings” of
those experts “should not be lightly overridden and set aside” simply
because a court “might reach a contrary opinion on the same evidence.”
Pub. Serv. Comm’n of Ind., 235 Ind. at 79, 131 N.E.2d at 311. Instead, our
courts have rightfully deferred to agency expertise, asking only whether
the agency’s action is “reasonable or within its power to make.” In re Nw.
Ind. Tel. Co., 201 Ind. at 676, 171 N.E. at 68; see also Christopher R. Brown,
D.D.S., Inc. v. Decatur Cnty. Mem’l Hosp., 892 N.E.2d 642, 646 (Ind. 2008)
(applying a “deferential standard” when reviewing the “interpretation of
a statute by an administrative agency charged with its enforcement in
light of its expertise in the given area”). Such deference, Indiana legal
scholars have observed, reflects the “basic proposition that the special
competence of administrative agencies should have scope to operate and
that the courts in reviewing agency actions should not attempt to
supervise the agencies’ work or do it over again.” Ralph F. Fuchs, Judicial
Control of Administrative Agencies in Indiana: I, 28 Ind. L.J. 1, 2 (1952).

Second, rather than implicating a separation-of-powers violation,
agency deference embodies a prudential standard of judicial restraint.
Indeed, resolution of a statutory ambiguity is often less a question of law
than it is a “policy decision best left to the legislative branch generally”
and the administrative agencies specifically. See Shinall v. Bd. of Zoning
Appeals for Town of Ogden Dunes, 212 N.E.3d 675, 681 (Ind. Ct. App. 2023).
Take the examples set forth above. When considering the scope of DNR
jurisdiction based on what qualifies as a “stream,” or when faced with the
question of who is or who isn’t “disabled” and thus eligible for Medicaid
assistance, who should decide: the democratically accountable branches of
government or a judicial branch largely immune from answering to the
public?

Third, and relatedly, the principle of restraint embodied in judicial
deference to an agency’s construction of a statute aligns with this Court’s
long adherence to other deferential doctrines, including the well-settled
“presumption” that a statute is constitutional; the political-question
doctrine, which counsels against judicial “interference with the internal
operations of the General Assembly”; and the doctrine of primary
jurisdiction, which requires a “court to avoid answering technical

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 4 of 11
questions that the legislature gave an agency the power to decide” even
when the court exercises concurrent jurisdiction with the agency. See,
respectively, Morgan v. State, 22 N.E.3d 570, 573 (Ind. 2014); Citizens Action
Coal. of Ind. v. Koch, 51 N.E.3d 236, 242 (Ind. 2016); Duke Energy Ind., LLC v.
City of Noblesville, 234 N.E.3d 173, 180 (Ind. 2024).

Deference also promotes a level of stability in the law. By the time a
court has had an opportunity to construe an ambiguous statute
administered by an agency, the agency itself will likely have construed
that statute and taken some action under its authority. Jonathan R. Siegel,
The Constitutional Case for Chevron Deference, 71 Vand. L. Rev. 937, 943
(2018). The longer these regulatory actions follow the agency’s
understanding of a statute, the greater the risk of upsetting the reliance
interests of those governed by the agency when the Court eventually
intervenes and reaches a contrary conclusion.

In short, when a statute is ambiguous, it makes sense for courts to defer
to the views of an agency that is politically accountable, conscious of the
legislature’s policy goals, staffed by experts, and experienced at
administering a complex legal and regulatory scheme. It’s likewise wise
for courts to lean on expert policymakers to preserve stability in the law,
rather than venture their own inexpert views and risk upsetting both
policy goals and public-reliance interests.

The court, of course, still plays its part in all this. But rather than
inserting itself into an “agency’s expertise-driven, policy-laden functions,”
the court “polices the agency to ensure that it acts within the zone of
reasonable options.” Loper Bright Enters. v. Raimondo, 144 S. Ct. 2244, 2300
(2024) (Kagan, J., dissenting). Thus, our review is properly limited to
deciding whether the agency “acted within its legal guardrails” or “stayed
within its jurisdiction and conformed to the statutory standards and legal
principles involved in producing its decision.” Ind. Off. of Util. Consumer
Couns. v. Duke Energy Ind., LLC, 183 N.E.3d 266, 268, 269 (Ind. 2022); Ind.
Gas Co. v. Ind. Fin. Auth., 999 N.E.2d 63, 66 (Ind. 2013) (internal citation
and quotation marks omitted). Such an arrangement is “best suited to
keep every actor in its proper lane.” Loper Bright, 144 S. Ct. at 2300 (Kagan,
J., dissenting).

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 5 of 11
Nevertheless, the Court today flips the script. “Rather than deferring”
to an agency’s reasonable interpretation of an ambiguous statute, the
Court applies “plenary review” to its analysis. Ante, at 2. This standard,
the Court submits, comports with our “prerogative and competence” as
well as our “constitutional duty” to “act as the final and ultimate
authority” in declaring what the law is. Id. at 8 (internal citation and
quotation marks omitted). Anything less than fully independent review,
the Court suggests, would cede our core judicial function to another
branch of the government. See id.

I find this reasoning unpersuasive and inherently flawed.

For one thing, deference enters the picture only when a statute is
ambiguous enough to have more than one reasonable interpretation.
Agencies cannot, therefore, usurp legislative power by contravening clear
statutes or making law out of whole cloth.

Second, even when faced with an ambiguous statute, a court still
exercises its independent judgment and duty to interpret that statute—
nothing “require[s] courts” or “obliges courts to accept an agency’s
reasonable interpretations of law.” See id. at 7, 10 (emphases added).5 As
we emphasized in Moriarity, the deferential standard “does not abdicate
any of our duties, diminish the role of the judiciary, or cast doubt on any
rules of statutory construction by implication.” 113 N.E.3d at 620. Rather,
the “standard entails a fresh look at the dispute on appeal, including the
agency’s interpretation of the relevant statute, and allows us to continue
to say what the law is.” Id. (emphasis added). While recognizing “the
expertise contained within a co-equal branch of government and the value
to the public in being able to rely on reasonable agency interpretations,”

5I certainly don’t stand alone in reaching this conclusion. See, e.g., Jonathan R. Siegel, The
Constitutional Case for Chevron Deference, 71 Vand. L. Rev. 937, 963 (2018) (stressing that an
“interpretation is no less an interpretation” simply because it adopts the agency’s reasonable
reading of that statute); Henry P. Monaghan, Marbury and the Administrative State, 83 Colum.
L. Rev. 1, 27–28 (1983) (observing that, rather than “abdicating its constitutional duty to ‘say
what the law is’ by deferring to agency interpretations of law,” a court is “simply applying
the law as ‘made’ by the authorized law-making entity”).

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 6 of 11
the standard “retains for the judiciary the ultimate power to determine the
outcome of the dispute based on the law and facts.” Id. The idea that “a
reviewing court’s statutory interpretation begins and ends with agency
deference” under this standard is simply wrong, see ante, at 2, as Moriarity
itself and other cases clearly illustrate, see Moriarity, 113 N.E.3d at 621
(concluding that the DNR’s definition of a “stream” under the Dam Safety
Act is “consistent with dictionary definitions of the word” and finding
nothing inconsistent with that definition in the Act itself); Comm’r of Ind.
Dep’t of Ins. v. Schumaker, 118 N.E.3d 11, 20, 21, 22 (Ind. Ct. App. 2018)
(applying a deferential standard but ultimately concluding that the
agency’s interpretation of the statute was unreasonable).

With today’s decision, however, the Court demands more than just a
“fresh look.” Rather than showing judicial restraint, the Court “gives itself
exclusive power over every open issue—no matter how expertise-driven
or policy-laden—involving the meaning of regulatory law.” Loper Bright,
144 S. Ct. at 2295 (Kagan, J., dissenting). To be sure, “we have a
constitutional system of government in which the judiciary is said to be
supreme in determining the jurisdiction and limits on the powers of the
other branches of the government, as fixed by the constitution and laws.”
Pub. Serv. Comm’n of Ind., 235 Ind. at 81, 131 N.E.2d at 312. But “this
supremacy does not extend to the point where we may substitute our
judgment for, or control the discretionary action of the executive or
legislative branches, so long as their action is within the sphere and
jurisdiction fixed by the statutes and constitution.” Id. And yet, plenary
review does just that, effectively usurping “all discretionary action” in
those branches of government. Id.

B. The AOPA expressly exempts the IURC from recent
legislative reforms requiring plenary review of
regulatory statutes.

While acknowledging that it need not reconsider Moriarity deference as
it applies to agency interpretations of utility-code provisions (like here),
the Court nevertheless opines—in dicta—that it “may need to grapple
with the continuing vitality of Moriarity” given recent reforms to the

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Administrative Orders and Procedures Act (or AOPA). Ante, at 8–9. But
those reforms have absolutely no effect on the issue before us today. Code
section 4-21.5-5-11, amended in 2024, instructs Indiana courts to “decide
all questions of law . . . without deference to any previous interpretation
made by the agency.” I.C. § 4-21.5-5-11(b). But that provision, as with the
AOPA as a whole, expressly “does not apply” to the IURC (among other
state agencies). I.C. § 4-21.5-2-4(a)(8). And the exception makes sense,
given the IURC’s broad enforcement power over “all” laws governing
public utilities in the state, I.C. § 8-1-2-115, and a statutory scheme—
enacted well over a century ago—designed to ensure statewide uniformity
in utilities regulation, see City of Huntington v. N. Ind. Power Co., 211 Ind.
502, 510, 5 N.E.2d 889, 892 (1937) (discussing the 1913 Shively-Spencer
Act’s purpose of shifting “all control over public utilities” from the
municipal level to the IURC “as the agent of the state”). By requiring
plenary review of a regulatory statute administered by the IURC, today’s
decision stands in direct conflict with legislative signals to the contrary.

****

Perhaps recognizing the implications of its holding, the Court leaves in
place the deferential standard as it applies to “mixed” questions of law
and fact. See ante, at 14. Such a determination, the Court acknowledges, “is
subject to the commission’s considerable discretion and will be overturned
only if its reasonableness determination is itself unreasonable.” Id. But this
so-called clarification by the Court injects only confusion into the law.6 In
my view, any distinction between pure questions of law (e.g., what the
IURC must include in its order in deciding whether a TDSIC plan is
reasonable) and “mixed” questions of law and fact (e.g., whether the
TDSIC plan itself is reasonable) does little—if anything—to change the

6Commentators have long recognized the difficulty that often “arises when a determination
turns on a statutory phrase and is therefore one of law” and when, “at the same time,” the
determination “involves policy considerations which may enter into the statutory
interpretation,” rendering it a question of fact—e.g., whether an unemployed person is
“available” for work and is thus entitled to unemployment compensation. Ralph F. Fuchs,
Judicial Control of Administrative Agencies in Indiana: II, 28 Ind. L.J. 293, 328–29 (1953) (citing
Nelson v. Rev. Bd., 119 Ind. App. 10, 82 N.E.2d 523 (1948)).

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 8 of 11
status quo. After all, it’s “frequently in the consideration of mixed
questions that the scope of statutory terms is established and their
meaning defined.” Loper Bright, 144 S. Ct. at 2306 (Kagan, J., dissenting);
see also Henry P. Monaghan, Marbury and the Administrative State, 83
Colum. L. Rev. 1, 29 (1983) (stressing that “[a]dministrative application of
law is administrative formulation of law whenever it involves elaboration
of the statutory norm”).

II. Under our well-settled standard of review, the
IURC’s whole-plan interpretation is reasonable
and substantial evidence supports its findings of
fact.
Applying our well-settled deferential standard of review, I would hold
(A) that the IURC’s whole-plan interpretation of TDSIC cost-justification is
reasonable and (B) that substantial evidence supports its findings of fact.

A. The IURC’s whole-plan interpretation is reasonable.

The applicable statute provides four steps for IURC approval of a
TDSIC plan. The IURC’s order must (1) find the “best estimate of the cost
of the eligible improvements included in the plan,” (2) determine
“whether public convenience and necessity require or will require the
eligible improvements included in the plan,” (3) determine “whether the
estimated costs of the eligible improvements included in the plan are
justified by incremental benefits attributable to the plan”, and (4)
determine whether the plan is “reasonable.” I.C. § 8-1-39-10(b).

At issue here, as the Court points out, is the third step in this process.
The intervenors in this case, Duke Industrial Group, argue that this
provision asks whether “the estimated costs of the eligible improvements
included in the plan are justified by incremental benefits,” meaning that
each improvement must be separately assessed and that each
improvement must promise benefits that justify its own cost. Appellant’s
Br. at 22–23 (quoting I.C. § 8-1-39-10(b)(3)). A whole-plan interpretation,

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 9 of 11
they submit, allows utilities to pack their TDSIC plans with unnecessary,
overpriced “filler projects,” contrary to legislative intent. Id. at 26–27.

Looking first at the benefit side of the cost-benefit equation, it’s notable
that the provision ends with “incremental benefits attributable to the
plan.” It does not say “incremental benefits attributable to those
improvements.” Cf. I.C. § 8-1-39-12(d)(3) (requiring a determination of
“whether the estimated costs of the new projects or improvements are
justified by incremental benefits attributable to the new projects or
improvements.”). The text thus seems clear that the benefit side of the
cost-benefit equation comprises the benefits of the plan as a whole.

By contrast, the cost side of the equation is less clear. The phrase
“estimated costs of the eligible improvements included in the plan” is
ambiguous. It could mean that the costs to be justified are the costs of each
individual improvement separately or the costs of the plan in the
aggregate. Use of the plural “estimated costs” seems insignificant, as the
same subsection talks singularly of “the best estimate of the cost of the
eligible improvements” in step one. These terms apparently refer to the
same thing. The IURC’s whole-plan interpretation is at least reasonable. It
is “the plan” that is to be approved, not each eligible improvement. And it
is “the plan” whose benefits must justify the costs. This suggests it is the
plan, too, that needs to be cost-justified. The IURC explains that projects
with a negative cost-basis may be needed as a foundation for projects with
a positive cost-basis, justifying its whole-plan approach. And any concerns
over the inclusion of filler projects in a TDSIC plan are overstated, in my
view, given that step two requires improvements to serve public
convenience and necessity and step four requires the plan to be
reasonable.

Ironically, the Court’s decision—at least as I read it—seems to
implicitly conclude that the IURC’s interpretation (and application) of the
statute was reasonable after all. Applying plenary review to the applicable
statute, the opinion first concludes that the IURC must, when approving a
utility’s TDSIC plan, determine that the plan’s individual improvements
are cost-justified—i.e., that those “improvements are cost-justified on an
‘incremental’, improvement-by-improvement basis.” Ante, at 14. But then,

Indiana Supreme Court | Case No. 23S-EX-162 | December 19, 2024 Page 10 of 11
in holding that the IURC made the required determination, the opinion
states that the agency need not have recited the “benefit-to-cost ratios for
each project within Duke’s plan.” Id. at 14–15. In other words, so long as
the IURC’s order simply states that each of the projects are cost-justified,
without necessarily analyzing each of those projects, that will suffice for
purposes of complying with the statute. See id.

B. The IURC’s fact-finding is supported by substantial
evidence.
The IURC’s basic findings of fact are reviewed for “substantial
evidence” supporting them, without reweighing the evidence or assessing
witness credibility. Ind. Gas Co., 999 N.E.2d at 66. Whether Duke’s
individually cost-negative projects are cost-justified by the plan as a whole
is a question of ultimate fact reviewed for reasonableness, “with greater
deference to matters within the IURC’s expertise and jurisdiction.” Id.

At the IURC, Duke presented, among other things, the results produced
by a decision analytics software tool used for critical infrastructure
investment planning. This showed a 2.8 benefit-to-cost ratio for the plan.
There was, therefore, substantial evidence underlying the IURC’s
conclusion that Duke’s plan was cost-justified. And the Group’s
arguments do not undermine the reasonableness of the IURC’s ultimate
conclusion. Even with contingent costs accounted for, Duke’s analytics
showed a 2.4 benefit-to-cost ratio. This evidence amply supports the
IURC’s conclusion that the plan as a whole is cost-justified. The Group
does not dispute the necessity of the improvements or the reasonableness
of the plan, and so their challenge fails.

Conclusion
This Court should defer to the IURC’s reasonable interpretation of the
statute to require overall cost-justification of a TDSIC plan. In my view,
there was substantial evidence that Duke’s plan met this condition and the
IURC’s conclusion was reasonable. Therefore, the IURC’s approval should
be affirmed.

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Source: Frix Law Library, https://www.frixlaw.com/law-library/cases/10763943. Public record. Not legal advice.