Estimator
Estimate your savings.
From one electricity bill, a rough picture of the system that fits you. Everything is worked out in your browser; nothing is sent or stored.
Your estimate
Fill in your bill and tariff class to see an estimate.
An estimate, not a quote. A site survey decides the real figures: the roof’s orientation and shade, how you use power, and the tariff in force.
Request a site surveyOpens your email with this estimate already filled in.
How we work it out
- Your bill divided by your class’s tariff gives your monthly use in kWh.
- We take the share used in daylight, when panels work.
- The system is sized to that daytime use. Under the current rooftop rules, energy sent to the grid does not reduce the bill, so a bigger system saves no more.
- Each range comes from how sunshine differs across Indonesia: a bigger system where it is cloudier, a smaller one where it is sunnier.
Assumptions
- Yearly output per kWp, range across Indonesia
- 1,300 – 1,700 kWh
- Power of one panel
- 580 Wp
- Roof per kWp, including walkways and row gaps
- 6 m²
- Java–Madura–Bali grid emission factor
- 0.84 kg CO₂/kWh
- Daytime use when left empty: homes, business, industry
- 40% · 70% · 80%
- Value of energy sent to the grid
- not counted
Tariffs for Q3 2026 (July–September), unchanged since Q3 2022. Q4 2026 tariffs have not been announced.
Sources
- Ministry of Energy (ESDM), PLN electricity tariff table
- Ministry of Energy (ESDM), R-2 and R-3 tariff adjustment (June 2022)
- Ministry of Energy (ESDM), Q3 2026 tariffs unchanged
- Ministerial Regulation ESDM No. 2 of 2024 on rooftop solar
- Global Solar Atlas (World Bank / ESMAP), PV output potential
- ESDM Decree 163.K/HK.02/MEM.S/2021, Java–Madura–Bali emission factor
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