ROI Calculator
The ROI Calculator models the economics of your storage project: CAPEX and OPEX against a revenue stack of balancing services (FCR, aFRR, mFRR), arbitrage (day-ahead, intraday) and peak shaving. From this it derives IRR, NPV, payback, DSCR and the levelized cost of storage — in base, optimistic and pessimistic scenarios.
Price assumptions are indicative market averages for Germany (as of 2025/2026). You can adjust every input to your project assumptions; the calculation runs locally in your browser.
How it works
- 01
Enter project parameters: CAPEX, OPEX, WACC, lifetime, degradation, efficiency.
- 02
Select revenue streams: balancing services, arbitrage, peak shaving — with risk flags.
- 03
Optionally add debt: leverage, interest rate and tenor for the DSCR view.
- 04
Read the result: scenarios, key metrics, revenue breakdown and sensitivity to WACC and revenue level.
Key metrics (base scenario)
Revenue breakdown
Sensitivity — NPV
| WACC ±2 pp | −2 pp € -1.94 M | Base € -2.60 M | +2 pp € -3.13 M |
| Revenues ±15 % | −15 % € -3.52 M | Base € -2.60 M | +15 % € -1.68 M |
Indicative calculation based on average market prices. Balancing prices are historically volatile; actual revenues depend on marketing strategy, grid region and dispatch.
Methodology and scope
Scenarios stress revenues by ±30 %. Revenues scale with remaining capacity (degradation). DSCR is computed from annual pre-debt cash flow against annuity debt service. All values are indicative and do not replace a bankable revenue report.
Next step
Start your project or talk to us — we will connect you with the right contact.