BESS Economics: How Battery Storage Turns Demand Charges into Savings

Battery storage does more than store solar power — it shaves expensive demand charges, arbitrages time-of-use rates, and unlocks new revenue from grid services. Here is how the numbers add up.

Where battery value comes from

A well-sized battery energy storage system (BESS) creates value from several stacked revenue and savings streams. Understanding each is the key to building a project that pencils.

Demand charge reduction. Discharging during your monthly peak can cut demand charges that often make up 30–50% of a commercial bill.
Time-of-use arbitrage. Charge when energy is cheap, discharge when it is expensive.
Grid services. In many markets, batteries earn additional revenue providing frequency regulation and capacity.
Resilience. Backup power during outages protects revenue-critical operations.

Sizing matters

An oversized battery sits idle and erodes returns; an undersized one fails to capture the peak. The right design starts with interval meter data and a clear picture of your load profile and tariff structure.

A real example

Our 3 MW / 12 MWh South Georgia project illustrates the model: grid stabilization and peak shaving deliver value to both utility and commercial customers while the asset earns across multiple markets. Model your own BESS value before committing capital.