Nationwide Permit 51 authorizes discharges of dredged or fill material into non-tidal waters of the United States for the construction, expansion, or modification of land-based renewable energy production facilities. This includes infrastructure designed to collect energy from solar (concentrating solar power and photovoltaic), wind, biomass, or geothermal sources. The permit covers both the main energy generation structures and necessary attendant features required for the facility's operation. These features include roads, parking lots, utility lines, and stormwater management facilities located within the facility site. The permit is restricted to non-tidal waters and specifically excludes non-tidal wetlands adjacent to tidal waters.
The 2026 reissuance of NWP 51 maintains the core terms and conditions from the 2021 version, including the 1/2-acre acreage limit and the mandatory pre-construction notification requirement for all projects. The Corps reevaluated the permit's impact thresholds and determined they remain appropriate to ensure authorized activities result in no more than minimal individual and cumulative adverse environmental effects. While the regulatory text is unchanged, the supporting decision document has been updated with the latest environmental baseline data. This includes results from the 2022 National Lakes Assessment and the 2021 National Wetland Condition Assessment, ensuring that the cumulative impact analysis for the renewable energy sector reflects the most current available ecological science.
Compliance managers, developers, and civil engineers in the renewable energy sector use this permit. It is the primary authorization for solar farms, wind farms, and geothermal facilities that require minor filling of non-tidal wetlands or streams for foundations or site infrastructure.
The Corps determined that the reissuance of NWP 51 results in a 'no effect' finding for federally-listed endangered or threatened species and designated critical habitat. This finding is supported by General Condition 18, which prohibits any activity that 'might affect' listed resources from proceeding until a project-specific Section 7 consultation is completed. Because every project under NWP 51 requires a notification, the district engineer reviews each one for potential impacts to these species. Compliance with Section 106 of the National Historic Preservation Act is ensured through General Condition 20. The mandatory notification process allows the Corps to evaluate every proposed renewable energy facility for potential effects on historic properties. For Essential Fish Habitat (EFH), district engineers can apply regional conditions or conduct project-specific consultations to ensure that facility construction does not cause more than minimal adverse effects on sensitive aquatic environments.
Stay current on NWP 51 updates
Get notified when regulations change — no spam, just updates that matter.