Three reliability criteria (values still under debate): Frequency : Loss of Load Expectation must be less than 0.1 days per year Duration: The maximum expected length of a loss of load event, measured in hours, must be less than 12 hours, with a one-percent exceedance tolerance Magnitude: The amount of load shed during a loss of load event must be less than the maximum amount that can be safely rotated as determined by ERCOT, in consultation with PUCT staff and transmission operators,超过0.25%的公差