Industry data reveals current BESS project costs range between $280,000 to $480,000 per MWh installed, depending on configuration and ancillary components. . A Battery Energy Storage System (BESS) is a versatile power solution that stores electricity for later use. Outdoor BESS units are specifically designed to withstand harsh environments, making them ideal for remote locations, industrial sites, and renewable energy projects. These trailer-mounted units provide flexible runtimes, fast setup, and the ability to operate. . Prices have been falling, with lithium-ion costs dropping by about 85% in the last decade, but they still represent the largest single expense in a BESS.