Millbury Substation No. 3 - 345 kV Substation in Millbury, Massachusetts

Millbury Substation No. 3 is a high-voltage electrical substation located in Millbury, Massachusetts, United States. Operated by National Grid, it is part of the broader transmission infrastructure serving the New England region. The facility operates at 345 kV, a standard voltage level for bulk power transmission, indicating its role in interconnecting major power lines and ensuring reliable electricity supply. The substation operates under the regulatory framework of the North American Electric Reliability Corporation (NERC) and the Federal Energy Regulatory Commission (FERC), which enforce reliability standards for the bulk power system. As a 345 kV facility, it is classified as a transmission-level asset, subject to strict compliance requirements including NERC's Critical Infrastructure Protection (CIP) standards. Millbury Substation No. 3 serves as a critical node in the regional grid, supporting load centers in central Massachusetts and contributing to the resilience of the New England power system. Its location in an urbanizing area underscores its importance for local communities and industrial users. The substation's operational status and connection to National Grid's network highlight its role in maintaining grid stability and facilitating electricity distribution across the state.

The substation is situated in Millbury, a town in Worcester County, Massachusetts, characterized by a mix of residential, commercial, and industrial land uses. The surrounding area includes the Blackstone River Valley, which supports diverse ecosystems. As a high-voltage substation, its environmental impact is primarily related to electromagnetic fields and land use, but modern design minimizes ecological disruption. The facility's operation aligns with regional grid reliability needs, supporting the integration of renewable energy sources like wind and solar.