ISO-NE publishes amounts, sources of electric energy used to meet demand in 2025

ISO New England has published a breakdown of the amount of electricity produced by generators in New England and imported from other regions to satisfy all residential, commercial, and industrial customer demand from the power grid in 2025.

Total production for the year, known as net energy for load (NEL), amounted to 117,744 gigawatt-hours (GWh), 1% higher than in 2024.

NEL is calculated by adding total electricity generation and price-responsive demand reduction within New England to net imports from neighboring regions. The energy used to operate pumped storage power plants and battery storage units is then subtracted from that sum. Numbers are preliminary, pending the resettlement process.

New England is historically a net importer of electricity. However, net imports have decreased over the last two years. In 2025, imports amounted to 8,146 GWh, or about 7% of NEL. Hydroelectric generation accounted for 7,060 GWh, or about 6% of NEL. Decreases in both imports and hydropower have been linked to drought conditions.

Wind power output increased by 31% from 2024 to 2025, rising to 4,618 GWh or 4% of NEL. Solar output rose by a more modest 6%, to 4,836 GWh.

Oil-fired resources produced about 3.5 times more electricity in 2025 than the previous year — 1,147 GWh, which represents about 1% of NEL. The increase was related to colder temperatures in January and December. Production from coal-fired resources was relatively unchanged year over year, amounting to 268 GWh or 0.2% of NEL in 2025.

The table below contains a breakdown of the resources used to meet NEL in 2025. More detailed information is available on the Resource Mix webpage.

Energy source	Energy produced (in gigawatt-hours)	Percentage of NEL
Natural gas	60,447	51%
Nuclear	27,620	23%
Net imports	8,146	7%
Hydro	7,060	6%
Solar	4,836	4%
Wind	4,618	4%
Refuse	2,563	2%
Wood	2,012	2%
Oil	1,147	1%
Other	704	0.6%
Landfill gas	339	0.3%
Coal	268	0.2%
Methane	21	0.02%
Price-responsive demand	10	0.008%

Note: Percentages shown may not sum correctly due to rounding. Historical data on consumer demand for electricity, and how that demand was met, is available in spreadsheet form on the Net Energy and Peak Load webpage.