This disconnect reveals a deeper truth about today’s storage market cost structure. BESS capex is no longer behaving like a technology cost curve, because storage now functions as infrastructure rather than a modular technology. That shift began years ago, as balance of system and soft costs outgrew cell costs.

This has now become decisive. Batteries and hardware costs continue the downward share trend on total project cost, while soft costs – that is, permitting, interconnection, compliance, and execution – are increasingly influencing the BESS cost gap across regions. The result is a market in which costs feel unstable, not because batteries are getting expensive, but because building them has become harder, slower, and more constrained.