A 1MWh BESS is an energy storage system with around 1,000 kilowatt-hours (kWh) of usable energy, typically deployed at C&I sites as a site-level asset for peak shaving, PV self-consumption, tariff arbitrage, backup power, and microgrid-ready operation. At this scale, design is driven not only by energy (MWh), but by architecture choices, including AC bus voltage, grid-tied/off-grid transfer strategy, and the required level of power quality and. Data center owners aspire to maintain resiliency, mitigate energy costs, be sustainable, monetize underutilized assets, and reduce reliance on diesel generators. This creates valid use cases for Discover additional documents & tools reserved for our partners. Find and download documentation for up. A Battery Energy Storage System (BESS) is a group of rechargeable batteries combined with inverters, control software, and safety systems that store electricity and release it when needed. According to Wood Mackenzie, it has seen a 44 percent expansion in 2024, with more than 69GW of new BESS capacity installed globally. Despite the growth, the role. Utility-scale batteries deliver critical benefits when it comes to speed, cost, and reliability, enabling data centers to accelerate interconnection timelines, manage seamless power source transitions and ensure power quality as onsite energy portfolios evolve.