An Evaluation of Storage for Commercial Scale Demand Charge Management in British Columbia

摘要

British Columbia provides electrical service using regulated rates for energy and demand charges. Under this limited market structure, where there is no time-of-use tariff, benefits of behind-the-meter storage are derived from demand charge management or renewable integration. Potential cost savings for a commercial load (a university) using electrical storage for demand charge reductions are investigated. Battery sizes of 500 kW/2 MWh and 1 MW/3 MWh with round trip efficiencies between 80 - 100% are analyzed. Demand data with 15-minute resolution over one year is tested using simple battery dispatch strategies. Neglecting investment costs, annual operational savings vary from 50 - 70 K$/year depending on battery rating, efficiency and dispatch strategy. Cost savings and value may be increased with optimized storage rating and dispatch strategy.