The average annual capacity factors for natural gas-fired generators in the PJM Interconnection, the largest competitive wholesale electricity market in the United States, have increased in recent years, reflecting greater use of natural gas-fired generators in the region.

The increase in PJM’s capacity factors for natural gas-fired generators is the largest of any regional transmission organization in the country in the past five years (2013–2017). Capacity factors are an indicator of how often a generator is run, and the combination of add...


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