If 24 hours of elevated distribution storage based on average daily demand is not available, provide all plants with portable or in-place internal combustion engine equipment which will generate electric power to allow continued operations, at peak hourly demand, during a power failure.

Added at 18 Ok Reg 1612, eff 6-1-01

Amended at 25 Ok Reg 2304, eff 7-11-08

Amended at 33 Ok Reg 1472, eff 9-15-16