Cos Cob Diesel Power Plant | Connecticut Peaking Facility

Cos Cob is a diesel power plant located in Connecticut, United States, with a capacity of 115 megawatts. Owned by Connecticut Jet Power LLC, the facility is operational and serves as a peaking power source, typically running during periods of high electricity demand or grid emergencies. Its location in the northeastern US places it within a region with diverse energy mix and stringent environmental regulations. The plant operates on oil as its primary fuel, a common choice for peaking plants due to its energy density and quick start capabilities. Diesel plants of this scale often use reciprocating engines or combustion turbines. The facility is subject to US EPA regulations under the Clean Air Act, including National Ambient Air Quality Standards (NAAQS) and potentially the Acid Rain Program, which govern emissions of SOx, NOx, and particulate matter. As a peaking plant, Cos Cob plays a critical role in maintaining grid reliability in Connecticut, especially during summer heatwaves or winter cold snaps when demand spikes. Its relatively small capacity compared to base-load plants means it operates fewer hours annually, but its emissions per MWh can be higher due to the fuel type. The plant's environmental impact is managed through permits and compliance with state and federal air quality standards.

The plant's use of oil as fuel results in higher CO2, SOx, and NOx emissions per MWh compared to natural gas or renewable sources. Its location in Connecticut, a state with ambitious climate goals, means it operates under strict emission limits. Proximity to populated areas could raise local air quality concerns, particularly during peak operation. The plant's age and technology (likely older diesel engines) may contribute to a larger environmental footprint relative to modern combined-cycle plants.