At noon on Sunday, ISO-New England reported that electricity being used in the six states came from these sources:

  • Rooftop solar: 5964 MW (estimated, since it’s behind the meter)
  • Nuclear: 3361 MW
  • Fossil gas: 2331 MW
  • Utility solar and wind: 1765 MW
  • Hydro: 1027 MW
  • Burning waste (wood, trash, landfill methane): 600 MW
  • Other (coal, oil, batteries): 6 MW

That means that of 13,801 MW total consumption at that moment, 13,017 MW or 81% was releasing no greenhouse gas at all. Hooray!

An extra note: At 12:30 p.m., the estimated behind-the-meter solar hit 6,079 MW, which is an all-time record for New England. That record gets broken multiple times every spring and is about 30% higher than the record at this time last year.

Sunday is a low usage day and it was cool, breezy and sunny, perfect for wind and solar production. Weekends in spring are usually the high point for percentage of renewables on the New England grid. So this isn’t a pattern that holds up most of the year.

But the accomplishment is still worth celebrating, since not long ago nobody thought the grid could function with this much intermittent power. As offshore wind cranks up and solar keeps being installed, we should be able to better this mark pretty soon.

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