Turn your Taipower bill into a factory battery business case in seconds: the right size, the MOEA subsidy, payback, IRR and blackout backup hours.
No consultant, no waiting for quotes. Know whether it pays before you talk to an integrator.
Contract capacity, summer peak kWh and non-summer semi-peak kWh. Tariff, cost and efficiency are all editable.
Compares every size from 0.5 to 10 MWh, keeps battery power within your contract capacity and peak load, and checks subsidy eligibility.
Investment, subsidy, annual savings, payback, IRR, NPV, a 15-year cash-flow chart and backup hours, saved to PDF in one click.
The same 1 MW / 2 MWh system over 15 years at a 6 % discount rate (conservative demand-charge case):
| Tariff | Subsidy | Payback | IRR | NPV (NT$ M) |
|---|---|---|---|---|
| 2023 tariff | No | Never | negative | −21.2 |
| 2023 tariff | Yes | 10 yrs | 2.8 % | −2.5 |
| Current (Oct 2025) | No | 10 yrs | 4.7 % | −1.8 |
| Current (Oct 2025) | Yes | 6 yrs | 14.8 % | +8.2 |
| Storage TOU (proposed) | Yes | 5 yrs | 20.6 % | +15.6 |
Assumptions: NT$12.5 M/MWh build cost, 88 % round-trip efficiency, 2 %/yr fade, 6,000-cycle life, 1.5 %/yr O&M. Storage-TOU figures are reported design targets, not a published tariff.
Taiwan's grid is tight and AI demand is climbing. A factory's own power resilience is becoming a competitive edge.
households hit by the 13 May 2021 and 3 March 2022 blackouts.
projected 2025 operating reserve margin: little room at the summer peak.
expected AI data-center demand by 2028.
10-year grid-resilience plan pushing a more distributed grid.
It starts with a free calculator. The long-term goal: battery networks that work like an energy bank, where stored power backs real value.
Bill in, size, subsidy, payback, IRR and backup out.
Import AMI meter data for exact sizing and contract-capacity tuning.
Decides charge and discharge every day from tariffs, load and weather.
Use the same storage to charge employee EVs off-peak.
It is a first-pass estimate: dischargeable energy is inferred from monthly peak and semi-peak use. A final design needs 15-minute demand data, your contract-capacity structure and supplier quotes. The math is checked line-for-line against the Python model in the repo.
Taipower's dReg / E-dReg market is saturated, and clearing prices were near NT$0 by late 2025. Leaving it out keeps the numbers conservative.
No. The calculator is one static page that runs in your browser. You can also download it and use it offline.
MOEA industrial storage subsidy: NT$5 M per MWh, up to 50 %, 1–10 MWh, factories in industrial / science / tech parks, domestic cells, non-PRC communication modules and a 3-year evening peak-shift commitment at 80 %. Check the latest MOEA notice.