AMERICAN ELECTRIC POWER CO INC

•System Average Interruption Duration Index (SAIDI) (5% weight). SAIDI represents the average outage duration for each customer served. The targets were set based on the five-year average SAIDI performance with the highest and lowest values removed to reduce the impact of abnormally high and low years. AEP performance is determined based on a customer weighted average of our operating company scores. The threshold (0% payout) was 120% of the target or 115% for Public Service Company of Oklahoma (PSO), the target (100% payout) was the five-year average SAIDI described above, excluding jurisdictional major event days, and the maximum (200% payout) was 80% of the target (95% for PSO). The PSO threshold is set at plus 15%, and maximum at minus 5% due to their historically stronger SAIDI performance.