# 18 C.F.R. § 1318.505 (2026): Information requirements

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_505

## Section

- **Citation:** 18 C.F.R. § 1318.505 (2026)
- **Heading:** Information requirements
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 18 CFR: Conservation of Power and Water Resources / Chapter XIII: TENNESSEE VALLEY AUTHORITY / Part 1318: IMPLEMENTATION OF THE NATIONAL ENVIRONMENTAL POLICY ACT OF 1969 / Subpart F: Miscellaneous Procedures / § 1318.505: § 1318.505   Information requirements.

## Text

(a)
Methodology and scientific accuracy.
To ensure the professional integrity, including scientific integrity, of the discussions and analyses in environmental documents, TVA will rely on reliable existing applicable data and resources. TVA will identify any methodologies used and reference to scientific and other sources relied upon for its conclusions in environmental documents. TVA is not required to undertake new scientific and technical research to inform the analysis but may do so at its discretion.
(b)
Incomplete and unavailable information.
When there is incomplete or unavailable information relating to the reasonably foreseeable significant adverse effects on the human environment, TVA will make clear that such information is lacking in the EIS. If the incomplete but available information is essential to a reasoned choice among alternatives and costs of obtaining it are reasonable, TVA will include the information in the EIS. If information cannot be obtained because the cost is unreasonable or the means to obtain it are not known, TVA will state in the EIS that the information is unavailable, explain the extent to which the information is relevant to its evaluation of reasonably foreseeable significant adverse effects, and summarize existing scientific evidence addressing the reasonably foreseeable significant adverse effects. TVA will include its evaluation of effects based upon theoretical approaches or research methods generally accepted in the scientific community.

## Nearby sections

- [18 C.F.R. § 1318.500 (2026) § 1318.500   Public and stakeholder involvement.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_500.md)
- [18 C.F.R. § 1318.501 (2026) § 1318.501   Mitigation.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_501.md)
- [18 C.F.R. § 1318.502 (2026) § 1318.502   Programmatic environmental documents and tiering.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_502.md)
- [18 C.F.R. § 1318.503 (2026) § 1318.503   Coordination with project sponsors and procedures for project sponsor-prepared environmental documents.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_503.md)
- [18 C.F.R. § 1318.504 (2026) § 1318.504   Reducing paperwork and delay.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_504.md)
- [18 C.F.R. § 1318.505 (2026) § 1318.505   Information requirements.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_505.md)
- [18 C.F.R. § 1318.506 (2026) § 1318.506   Causes of action.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_506.md)
- [18 C.F.R. § 1318.507 (2026) § 1318.507   Emergency actions.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_507.md)
- [18 C.F.R. § 1318.508 (2026) § 1318.508   Unique identification numbers.](https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_508.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T18_P1318_S1318_505. Check the current official text before relying on it. Not legal advice.