The maximum acceptable level of risk in the supply of energy demand. This level of risk is measured with the expected energy rationing value index (VERE), expressed in terms of percentages of the monthly energy demand and has a value of 1.5%, obtained as the maximum value by which the energy demand can be reduced by reducing voltage and frequency, without disconnecting circuits. Additionally, there is the conditioned energy rationing expected value index (VEREC), corresponding to the expected value of rationing when it occurs, whose limit value is 3% of the energy demand, and the number of cases with rationing, whose limit is 5 cases. (Source: R. CREG-025-1995; Annex).