Germany, Feb. 14 -- RWE has commissioned one of the largest German battery storage systems at the Group's Hamm and Neurath sites, with a total capacity of 220 megawatts (MW). It can reach its nominal capacity within seconds and provide power at that level for around one hour (235 megawatt hours, MWh). RWE is making the electricity from the battery storage systems available on various energy markets. The system contributes towards stabilising the electricity grid in particular through the balancing energy markets.The storage system comprises 690 battery cabinets with eight battery modules each, with 140 MW (151 MWh) of capacity in Hamm (commissioned in December) and 80 MW (84MWh) in Grevenbroich-Neurath. In addition to the batteries, RWE als...