What defines a Cold Weather Event?
There are three distinct levels of weather situations that may precede ISO New England calling a Cold Weather Event: • Cold Weather Conditions means any calendar day when that day’s Effective Temperatures are forecast to be equal to or less than zero degrees Fahrenheit for any single on-peak hour and that day’s total Effective Heating Degree Days are forecast to be greater than or equal to 65. • Cold Weather Watch means Days when Cold Weather Conditions are forecast to exist and the 7-Day Capacity Margin Forecast indicates a capacity margin greater than or equal to 1,000 MW. • Cold Weather Warning means Days when Cold Weather Conditions are forecast to exist and the 7-Day Capacity Margin Forecast indicates a capacity margin less than 1,000 MW. In addition, a Cold Weather Warning will be used for all future days within the 7-Day Capacity Margin Forecast when a capacity margin of less than or equal to 0 MW exists for days not yet declared as a Cold Weather Event. • Cold Weather Event mea
