BP recently installed a REDA dual electrical submersible pump (ESP) system from Schlumberger at Wytch Farm oil field, Dorset, England. The system, designed for redundant operation, will enable BP to reduce workover frequency by increasing ESP system runlife. Wytch Farm is a mature field in an environmentally sensitive area. Any reduction in workover frequency is considered a big win within BP. ESPs installed in similar Wytch Farm wells have achieved run lives in excess of 1,500 days. Therefore, the new ESP assemblies were designed to account for changing reservoir conditions over this period, and they feature two different pump configurations, with plans to switch operation between the two systems in the future. Gauges that allow the use of a 24-hour surveillance, monitoring, and optimization service also were installed. Described here are the background of dual ESPs to reduce workover costs, the need for the dual system in Wytch Farm’s environmentally sensitive Well L-12, design features of the system, and delivery and installation in September 2004.