Cos Cob

Other power plant · Fairfield County, Connecticut

Nameplate capacity
115 MW
Rank in Connecticut
#16
of 184 plants
In service since
1969
September 1969

Details

Primary fuel
Other
Technology
Petroleum Liquids
Operator
Connecticut Jet Power LLC
County
Fairfield County
Generating units
5
Share of state capacity
1.05%
Rank among other plants in Connecticut
#7 of 29
EIA plant code
542

Generating units

Individual generating units at Cos Cob
UnitTechnologyNameplateSummerOnlineStatus
UN10Petroleum Liquids25 MW19 MW1969Operating
UN11Petroleum Liquids25 MW19 MW1969Operating
UN12Petroleum Liquids25 MW19 MW1969Operating
UN13Petroleum Liquids20 MW19 MW2008Operating
un14Petroleum Liquids20 MW20 MW2008Operating

Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.

Similarly sized plants in Connecticut

Devon StationOther223 MW
Gravel Pit Solar, LLCSolar120 MW
Waterbury GenerationNatural gas96 MW
A L PierceNatural gas84 MW

About this data

From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 115 MW solar plant and a 115 MW nuclear plant have the same entry here and produce very different amounts of electricity.

“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Connecticut power plants · What Connecticut actually generates