Mystic Generating Station — United States of America
Gas power plant in Massachusetts, United States of America. Approximate location 42.3908, -71.0675.
GasMassachusettsUnited States of AmericaCO₂ measured
Mystic Generating Station is a 2,375.6 MW gas power station in Massachusetts, United States of America. It is operated by Constellation Mystic Power LLC. Based on reported annual generation of 2,188 GWh, it can supply roughly 625k homes. It ranks #112 of 10,884 United States of America power plants by installed capacity. Commissioned in 1995, it is around 31 years old — long-established. Its annual emissions of 528,357 t CO₂/yr (US EPA GHGRP) are equivalent to about 123k cars driven for a year. In context, gas supplies about 40.0% of United States of America's electricity; the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0001588.
Data status
Known data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Source of the capacity and fuel values:
capacity: Wikidata P2109; fuel: WRI GPPD
In context: how this plant compares
At 2,375.6 MW, Mystic Generating Station is well above the median gas plant in United States of America (121.2 MW). Gas plants burn natural gas either in open-cycle turbines for fast peaking, or in combined-cycle units that recover exhaust heat in an HRSG to reach roughly 55–62% efficiency — the cleanest-burning fossil option.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
528,357 t CO₂/yr — in everyday terms
This facility's annual emissions are roughly equivalent to:
Equivalencies via US EPA Greenhouse Gas Equivalencies; emissions per US EPA GHGRP (measured for US EPA/EU ETS, modelled for Climate TRACE).
Key facts
- Load factor
- 11%, from 2,188 GWh of reported generation; the median for 1622 gas plants in United States of America that report generation is 26%
- Generation trend
- 7,054 GWh in 2013 and 2,188 GWh in 2019 (−69%)
- Highest and lowest year
- 2017: 7,144 GWh; 2014: 1,840 GWh
- Share of United States of America gas capacity
- 0.3% of 789,950 MW across 2,165 plants in this dataset
- Age among peers
- 714 of 1,973 dated gas plants in United States of America are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Reported generation trend
Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Constellation Mystic Power LLC.
Local climate & thermal context
This gas plant burns natural gas in a turbine — often in a combined-cycle setup — to generate electricity. It sits in a hot-summer humid continental climate (Köppen Dfa) — Northern Hemisphere, latitude 42.4°N — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
Heating degree-days here run 29% above the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.
Climate heat-demand index: 67/100 — this site sits in the top third of the power plants we cover by heating degree-days.
A gas turbine here also runs ~0% below its ISO (15°C) rating at this annual mean (typical CCGT curve, estimate).
Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.
Site climate & environmental severity
This site sits in a corrosive environment (estimated ISO 9223 class C4 — High), with thermal cycling the leading environmental stress.
Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.
How it compares & nearby plants
The #26 largest gas power plant of 2165 in United States of America by capacity.
United States of America has 2165 gas power plants in this dataset, together about 789,950 MW of capacity.
Nearby power plants
- Charlestown Wind Turbine · Wind · 1.5 MW · Massachusetts
- Kendall Square Station · Gas · 234.7 MW · Massachusetts
- Mass Inst Tech Cntrl Utilities/Cogen Plt · Gas · 21.2 MW · Massachusetts
- Gillette SBMC · Gas · 14.2 MW · Massachusetts
- NECCO Co-Generation · Gas · 5.8 MW · Massachusetts
- Boston Medical Center CHP Plant · Gas · 2 MW · Massachusetts
Location
Coordinates 42.3908, -71.0675 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Mystic Generating Station?
Mystic Generating Station is a 2,375.6 MW gas power plant in Massachusetts, United States of America, commissioned in 1995.
How much electricity does Mystic Generating Station generate?
Mystic Generating Station generates about 2,188 GWh of electricity per year.
Who operates Mystic Generating Station?
Mystic Generating Station is operated by Constellation Mystic Power LLC.
How much CO₂ does Mystic Generating Station emit?
Mystic Generating Station has measured emissions of about 528,357 tonnes of CO₂ per year (US EPA GHGRP).