As utility-scale battery energy storage systems (BESS) scale from megawatts to gigawatts, the engineering complexity grows exponentially. As deployments accelerate, engineering teams need to treat connectivity as a first-order design decision, not a procurement afterthought. According to the U.S. Energy Storage Coalition, the U.S. now has the capacity to supply 100% of domestic energy storage project demand with American-built systems, with factories producing roughly 69 GWh of finished grid storage systems annually as of end-2025 and on pace to reach 164 GWh by end of 2027. What Comes Next for Grid-Scale ConnectivityThe demands placed on energy storage systems will continue to intensify as the grid evolves. Connectivity may not be the most visible part of a battery storage system, but it is one of the most consequential.