Abstract: Energy utilized or consumed at a given location or facility causes pulses to be generated as a function of the instant rate of energy use, and such pulses are counted during succeeding discrete time intervals. The succeeding interval summation count values are recorded in digital form at respective discrete locations in a memory, particularly on an ultraviolet (UV) light-erasable PROM (EPROM) contained in a removable cartridge having a UV substantially opaque case. The interval summation count values are summed to provide a grand total energy or power utilization or consumption figure which is fed into and stored at a discrete location in the EPROM memory at the end of the recording period.