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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 at succeeding discrete time intervals. The succeeding interval summation count values are recorded in digital form at respective disc

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 at succeeding discrete time intervals. The succeeding interval summation count values are recorded in digital form at respective discrete locations 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. The succeeding interval counts are successively compared and the peak count value for that interval having the greatest energy usage within a particular total time period composed of a multiple of such succeeding discrete time intervals is recorded on the EPROM at the conclusion of the particular total time period and the cartridge is removed, after having also recorded on the EPROM in digital data form and at respective discrete memory locations the respective times of beginning and end of the particular total time period of energy use measurement and recording, as well as recording thereon the place or location of the energy use facility whose energy use is being measured and recorded.

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Electrical energy recording apparatus comprising a removable solid state electronic recording cartridge including a protective cartridge case having a programmable read-only solid state electronic digital memory unit contained therewithin, means for generating electrical pulses at a variable frequen

Electrical energy recording apparatus comprising a removable solid state electronic recording cartridge including a protective cartridge case having a programmable read-only solid state electronic digital memory unit contained therewithin, means for generating electrical pulses at a variable frequency varying as a function of instant electrical energy utilization at a given energy use location or facility, means for converting the total number of pulses in each of a plurality of sequential time intervals into a succession of respective interval summation digital signals each of which is representative of the total pulses occurring in each respective successive time period, temporary memory storage means for storing the first of said respective interval summation digital signals, comparator means for comparing each succeeding interval summation digital signal with the then stored interval summation signal, logic means responsive to the occurrence of a succeeding interval summation digital signal larger in value than the then stored interval summation digital signal to effect substitution of said larger value interval summation digital signal in said temporary memory means in replacement of the instant stored digital signal against which such larger replacement interval summation digital signal has been compared, means for feeding each successive one of said interval summation digital signals to and recording such at respective sequentially successive memory locations on said removable recording cartridge programmable read-only solid state electronic digital memory unit, means for recording in said cartridge read-only memory after the termination of a plurality of said time intervals, a digital signal equal in value to the interval summation digital signal then stored in said temporary memory and representing the peak energy utilization for the total of the recorded time intervals, said recording being effected at a selected open memory location in said removable cartridge read-only memory, means for summing in a total energy utilization temporary memory the running composite total of said electrical pulses between the respective times of commencement and termination of recording of signals as a function of said pulses, means for recording in said cartridge read-only memory at a selected open memory location a digital signal corresponding to the signal value then in said total energy utilization temporary memory at said termination time, and means for recording in digital form on said removable cartridge read-only memory at respective open memory locations both the time of commencement and the time of termination of said time intervals.