Download the latest edition of ISO-NE’s Wholesale Markets Project Plan

The June update of ISO New England's Wholesale Markets Project Plan (WMPP) is now online. The WMPP provides a biannual update of the market-related activities described in the ISO's Annual Work Plan (AWP), as well as updates on additional market-related activities pursued by the ISO. It’s published in summer and winter.


Now online: Internal Market Monitor Asset Characteristics UI webinar recording

The presentation and recording of the June 14, 2017, Internal Market Monitor Asset Characteristics (IMMAC) UI webinar are now available on the ISO New England website.This webinar reviews the functionality and workflow of the new Internal Market Monitor Asset Characteristics (IMMAC) user interface (UI) that allows market participants to initiate asset parameter changes. Questions? Email the customer training team at


Wholesale electricity prices and demand in New England, May 2017

Rising natural gas prices caused wholesale electricity prices to increase during May

Natural gas prices in May were nearly 44% higher than during the previous May in New England, pushing up the average wholesale power price to $29.44 per megawatt-hour (MWh)*, a 38.2% increase compared to the May 2016 average price of $21.29/MWh. For a month-to-month comparison, the May power price was 6.6% lower than the April average price of $31.51.

While the month of May was not particularly unusual, one day—May 18, the day of the May peak—was interesting for significant price variations resulting from a combination of planned power plant and transmission line outages and unusually high temperatures. The range in five-minute prices—from negative prices in northern areas of New England to prices over $800/MWh in other parts of the region—is illustrative of the operational challenges that can arise during the “shoulder seasons” of spring and fall, when consumer demand for power is typically lighter and power plant and transmission lines are taken offline for maintenance and repairs. Read more about the dynamics at work that day. 

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Now online: Recording of Q2 2017 Settlements Issues Forum

The presentation and recording of the June 8, Quarterly Settlements Issues Forum webinar are now available for download from the Quarterly Settlements Forum page. These quarterly interactive, web-based meetings cover upcoming changes affecting ISO New England settlements and billing and are open to interested market participants. Email the training team with questions at


ISO-NE prepared to operate grid through partial solar eclipse in August

Effects on solar-powered resources will be lesser than if total eclipse or if eclipse took place earlier in summer

New England will be under the shadow of the moon for much of the afternoon on August 21 during a partial solar eclipse. According to NASA, the eclipse will occur between approximately 1:20 p.m. and 4:00 p.m., with the peak expected at around 2:45 p.m., when about 65% of the sun will be blocked (called obscuration). If it is a sunny day, the ISO expects that output from the region’s 2,000 megawatts (MW) of solar photovoltaic (PV) systems will drop during these 2 hours and 40 minutes, but anticipates having sufficient resources available to meet the resulting rise in electricity demand.

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Significant price variation on May 18 highlights operational challenges of operating the grid during spring and fall

Real-time prices ranged from a high of $758.88 MWh in the northeastern Massachusetts and Boston pricing zone to a low of -$71.07 MWh price for power from New Brunswick

Thursday, May 18, 2017, was a hot one. If you have an interest in energy, you may have checked the New England locational marginal pricing (LMP) map that day, expecting to see prices rise across the region, responding to the hotter than normal weather. Instead, you saw an unusual, rainbow-like effect on the map, indicating a wide variation in real-time wholesale electricity prices. The real-time price spread was caused by challenging power grid circumstances that can occur mainly during spring and fall (but also any time of year, depending on resource availability): when unseasonable weather drives a spike in demand while major energy infrastructure is offline for maintenance.

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