In this section

Related Links

Three-Day Reliability Region Demand Forecast

Download the ISO's hourly demand forecast for each day as forecasted in-day and the preceding two days, broken down by reliability region. The region's transmission system is divided into eight reliability regions that reflect the system's operating characteristics and major constraints. New England's load zones, which represent aggregations of pricing nodes within specific areas, generally correspond to these reliability regions.

 

Note: NEMASSBOST = Northeast Massachusetts and Boston Area Reliability Region; SEMASS = Southeast Massachusetts Reliability Region; WCMASS = Western/Central Massachusetts Reliability Region; % = the reliability region's demand as a percentage of the zonal total. The demand included in the forecast is in megawatts (MW).

Forecasts prior to May 24, 2017, can be found on the Three-Day Reliability Region Demand Forecast Archive.

 

 
Three-Day Reliability Region Demand Forecast
Description Timestamp Download
December 30, 2025 12/28/2025 09:32 AM EST CSV
December 16, 2025 12/16/2025 01:29 PM EST CSV
December 17, 2025 12/17/2025 01:32 PM EST CSV
December 18, 2025 12/18/2025 12:43 PM EST CSV
December 19, 2025 12/19/2025 04:26 PM EST CSV
December 20, 2025 12/20/2025 09:08 AM EST CSV
December 21, 2025 12/21/2025 10:56 AM EST CSV
December 22, 2025 12/22/2025 09:17 AM EST CSV
December 23, 2025 12/23/2025 09:19 AM EST CSV
December 24, 2025 12/24/2025 09:11 AM EST CSV
December 25, 2025 12/25/2025 06:03 PM EST CSV
December 26, 2025 12/26/2025 09:32 AM EST CSV
December 27, 2025 12/27/2025 09:29 AM EST CSV
December 28, 2025 12/28/2025 09:32 AM EST CSV
December 29, 2025 12/28/2025 09:32 AM EST CSV