Commercial calculator · Live model
Commercial Battery Storage Economics
Screen a behind-the-meter battery against the value streams that actually support the investment: demand-charge reduction, energy shifting, solar capture, grid programs, resilience, tax benefits, and the cost of capital.
01 · Facility
Establish the load and tariff context
Use billed demand and the actual commercial tariff. Averages can hide the short peaks a battery must catch.
Used only to identify state and likely utility.
Use the billed or metered peak, not average load.
02 · Battery and peak
Test whether power and duration can cover the target
The achievable demand reduction is constrained by both inverter power and usable energy across the peak window.
Capacity held back for controls, resilience, or warranty limits.
03 · Tariff and dispatch
Translate the tariff into annual operating value
Demand savings use the achievable peak reduction. Energy arbitrage accounts for charging losses through round-trip efficiency.
Reduces modeled savings for imperfect peak prediction and dispatch.
Capped by usable battery energy after reserve.
Reduces dispatch-dependent value to limit double counting.
04 · Capital and value stack
Build the full project stack
Keep tax credits, cash rebates, grid-program revenue, and resilience separate so each assumption can be audited.
Confirm eligibility, basis, labor rules, and adders with a tax professional.
Optional. Keep depreciation or transferred-credit value explicit.
Leave at zero unless downtime probability and cost are defensible.
The Internal Revenue Service lists energy storage as eligible for the Section 48E Clean Electricity Investment Credit when placed in service after December 31, 2024. The IRS states a 6% base credit, potentially increased to 30% when applicable requirements are met, with possible domestic-content and energy-community adders. The calculator does not determine eligibility.
Lifecycle and financingDiscount rate, degradation, O&M, augmentation, and ownership structure
Used only when a loan structure is selected.
Long-term view
Cumulative project value
Financing view
Loan-term comparison
Longer terms lower the required payment but increase total interest. These rows do not change finance-neutral project NPV or IRR.
| Term | Monthly payment | Total interest | Year-one DSCR | Owner NPV |
|---|
Audit the model
Year-by-year cash flow
Project returns remain finance-neutral. The owner column separately reflects the selected debt structure.
| Year | Operating value | Tax / upfront value | Project cash flow | Owner cash flow | Project cumulative |
|---|
How this estimate works
- Achievable peak shaveLowest of target kW, battery power, or usable kWh divided by peak duration
- Demand savingsAchievable kW × demand charge × eligible months × realization
- Energy arbitrageDelivered kWh × (peak rate − charging rate ÷ efficiency) × dispatches
- Project NPV and IRRFinance-neutral project cash flows; tax value is recognized in year one
- FinancingShown separately so low debt payments cannot make a weak project appear strong
- DegradationReduces operating value each year while escalation increases tariff and program value
This calculator is a screening model, not financial, tax, tariff, engineering, or dispatch advice. Commercial bills can include ratchets, coincident-peak charges, seasonal rates, standby charges, and program restrictions that this first-pass model does not simulate. Validate the result with interval load data, the applicable tariff, a controls strategy, and qualified tax and engineering professionals.