05/19/2026
[From Joseph LaRusso on LinkedIn]
Today is going to be a notable day—perhaps a record-setting day—in the ISO New England Inc. service territory.
To begin with, system emissions are much lower than usual. Per Electricity Maps, CO2eq emissions are 125g/kWh currently—an extremely low emissions rate for ISO-NE.
As I write this at 7:57 a.m. only 1,008 MW of natural gas generating capacity is being used to make power. That’s a mere 6% of the 16,372 MW of gas generating capacity available on the system. The region’s Nuclear generators (3,333 MW), Imports from New York and Canada, including hydropower delivered via the new New England Clean Energy Connect transmission line (2,221 MW), Renewables , which includes wind and utility-scale solar as well as generation from biomass and refuse (1,337 MW), and New England Hydropower (1,086 MW), are each producing more power currently than natural gas. What’s more, it’s a transparently clear day here in New England, so by midday behind-the-meter solar will likely be producing more than 6 GW of power.
The least amount of demand on the ISO-NE system, 5,318 MW, was recorded on April 20, 2025. Today, ISO-NE is predicting that today’s minimum of 5,860 MW will occur at 1:00 p.m. That’s low enough to put a new minimum demand record within reach.
And prices? Prices have been in and out of negative territory in the real time market all morning.
The addition of cleaner generating resources here in New England is having a measurable beneficial effect on emissions and pricing today, but today is just a snapshot of the larger impact those resources are having in the ISO-NE service territory throughout the year.
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