Key Grid
and Market Stats

Explore some of ISO New England’s most helpful and popular data about the region’s power system and wholesale electricity markets. Many stats illustrate the significant progress made since the ISO’s inception in developing a regional power system that is more reliable, cost-effective, and environmentally sound.

Learn more about the opportunities and challenges New England faces as the system continues to evolve. Also learn how the ISO is working toward a smarter, greener grid.

Fast Stats

Here’s a quick look at some key statistics about the region, its high-voltage transmission system, and its wholesale electricity markets. Numbers are rounded.

Electricity Use Learn More

  • 7.2 million retail electricity customers; population 14.8 million
  • 121,061 gigawatt-hours (GWh) total annual energy served in 2017 (subject to adjustments)
  • 136,355 GWh all-time highest total annual energy served, set in 2005
  • 28,130 megawatts (MW) all-time summer peak demand, set on August 2, 2006
  • 22,818 MW all-time winter peak demand, set on January 15, 2004
  • -0.6% average annual growth in regional electricity demand forecasted through 2026, after factoring in energy efficiency (EE) and distributed generation (DG)
  • -0.07% average annual growth in peak demand forecasted through 2026 under normal weather conditions after subtracting EE and DG; 0.1% under extreme summer weather

Resource Mix Learn More

  • 350 dispatchable generators
  • About 29,000 MW of generating capability for summer 2018 and 31,000 MW for winter 2018/2019 (seasonal claimed capability)
  • About 45% of regional generation lists natural gas as its primary fuel source, with 11% more listing it as a secondary fuel
  • About 14,800 MW of new generating capacity, mostly wind and natural gas, proposed to be built through 2024, though many projects ultimately withdraw (source: January 29, 2018, ISO Interconnection Queue)
  • 4,600 MW of non-gas-fired generating capacity retired or retiring 2013–2021, with over 5,000 MW from coal- and oil-fired plants at risk of retirement in the coming years
  • Over 2,700 MW of active demand response (DR) and energy efficiency and other passive demand resources are registered in New England (January 2018 DRWG monthly statistics)
  • About 1,500 MW in summer and 1,000 MW in winter of imported electricity are obligated to be available for the region—most from Canadian hydropower
  • Over 130,000 solar power installations totaling about 2,400 MW (nameplate), with most connected “behind the meter”

Transmission Learn More

  • 9,000 miles of high-voltage transmission lines (115 kV and above)
  • 13 transmission interconnections to electricity systems in New York and Eastern Canada
  • 17% of region’s energy needs met by imports in 2017
  • 746 project components placed in service across the region since 2002 to fortify the transmission system; 120 planned, proposed, or under construction, as of the October 2017 Regional System Plan Project List
  • Over 20 Elective Transmission Upgrades (ETUs) proposed as of the January 29, 2018, ISO Generator Interconnection Queue, totaling over 16,500 MW of potential transfer capability, which would help access non-carbon-emitting resources

Markets Learn More

  • Close to 500 buyers and sellers in the wholesale electricity marketplace
  • About 70% of real-time pricing set by marginal natural-gas-fired generators in the first three quarters of 2017, with wind setting price next most often (15%)
  • $6.9 billion traded in wholesale electricity markets in 2017 (data subject to adjustments): $4.5 billion in energy markets (which had the second-lowest average prices since 2003) and $2.4 billion in capacity and ancillary services markets

Air Emissions Learn More

  • 98%, 73%, and 29% decrease in annual regional emissions between 2001 and 2016 for sulfur dioxide (SO2), nitrogen oxides (NOX), and carbon dioxide (CO2), respectively
  • 51% and 34% decrease in oil- and coal-fired generation, respectively, between 2015 and 2016, largely due to warmer winter
  • 21% increase in production from solar and wind resources between 2015 and 2016