Cosumnes Gas Power Plant: 556.8 MW Facility in Sacramento, California

Cosumnes is a gas-fired power plant located in California, United States, with a capacity of 556.8 MW. It is owned and operated by the Sacramento Municipal Utility District (SMUD), a community-owned electric utility serving the Sacramento area. The plant plays a key role in meeting the region's electricity demand. The facility operates under the regulatory framework of the U.S. Environmental Protection Agency (EPA), including the Clean Air Act (CAA) and its National Ambient Air Quality Standards (NAAQS), as well as the Acid Rain Program and the Cross-State Air Pollution Rule (CSAPR). As a gas-fired plant, it benefits from lower emissions compared to coal-fired units, but still contributes to CO2 and NOx emissions. The plant's technology is typical for modern gas-fired generation, likely using combined-cycle or simple-cycle turbines. Cosumnes is strategically located to support the growing energy needs of the Sacramento region. Its operation by a municipal utility ensures local oversight and alignment with community energy goals. The plant's capacity places it in the medium-to-large scale for gas-fired plants in the U.S., contributing to grid reliability and supporting renewable energy integration through flexible dispatch.

The plant's gas fuel type results in lower CO2, SOx, and NOx emissions per MWh compared to coal, but still contributes to greenhouse gas emissions. Its location in California, a state with stringent air quality regulations, requires compliance with state and federal emission standards. The proximity to the Sacramento metropolitan area means emissions can affect local air quality, particularly during high-demand periods. The plant's age and technology (likely combined-cycle) influence its efficiency and environmental footprint.