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 challenges New England faces as the system continues to evolve. Also learn how the ISO is working toward a smarter 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

  • 6.5 million households and businesses; population 14 million
  • 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
  • Region’s overall electricity demand forecasted to grow 1.0% annually
  • Region’s peak demand forecasted to grow 1.3% annually
  • Energy efficiency slows growth in peak demand and flattens overall electricity demand

Resource Mix Learn More

  • 350 generators
  • 31,000 MW of generating capacity
  • 7,000 MW of proposed generating capacity
  • 3,400 MW of generating capacity expected to retire within five years
  • 2,000 MW of demand response (DR) and 1,300 MW of energy efficiency through the capacity market

Air Emissions Learn More

  • Average emission rates in New England for nitrogen oxides (NOX), sulfur dioxide (SO2), and carbon dioxide (CO2) have fallen overall since 2001 largely due to changes in the power supply mix

Transmission Learn More

  • 8,500 miles of high-voltage transmission lines (115 kV and above)
  • 13 transmission interconnections to electricity systems in New York and Eastern Canada
  • 14% of region’s energy needs met by imports in 2013
  • $6.6 billion in transmission investment since 2002; $4.3 billion planned 2013–2017
  • Developers proposing multiple transmission projects to access non-carbon-emitting resources

Markets Learn More

  • 500 buyers and sellers in the wholesale electricity marketplace
  • $9.2 billion traded in wholesale electricity markets in 2013 ($8 billion traded in energy markets; $1.2 billion traded in capacity and ancillary services markets)