Start where electricity is expensive and/or the revenue you steal from thermal generators (grid support mentioned, synthetic inertia, black start capability, etc) supports the economics, and work your way down as battery costs decline and you force thermal generators to become uneconomic due to compressing their runtimes. Think in systems.
https://www.energy-storage.news/global-bess-deployments-to-e...
Start where electricity is expensive and/or the revenue you steal from thermal generators (grid support mentioned, synthetic inertia, black start capability, etc) supports the economics, and work your way down as battery costs decline and you force thermal generators to become uneconomic due to compressing their runtimes. Think in systems.