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Comprehensive studies carried out by BEWAG since the mid-seventies have shown that steam storage or electrochemical storage units might be an appropriate means of fulfilling load frequency control and instantaneous ('spinning') reserve power requirements. Subsequent studies proved that an advanced lead-acid battery would be most suitable. Information on the operational behaviour of lead-acid batteries and their service life expectancy under load-frequency control stress was not available. It was decided to carry out a long-term test featuring the operational stress to be found in a full-scale installation. The main objectives were: to determine the battery service life; to optimize the operational regime for the storage system; to collect information on system efficiency and availability.