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About · Short Methodology
A 1-page summary: the data sources, core formula, and validation framework used by every solar estimate on this platform. For the full technical detail, see the full methodology page.
3 Primary Data Sources
Three primary sources are used cross-referenced — no proprietary data vendor, no figure we claim that can't be traced to a public source.
40-year solar irradiance for 121 Indonesian coordinates (38 provinces + 83 cities). Daily granularity, aggregated to monthly + annual PSH.
Source: power.larc.nasa.gov · CC-BY-4.0
Regional climate correction (7 Indonesian climate zones: West Sumatra, Java-Bali, Kalimantan, Sulawesi, Maluku-Papua, East Sumatra, Nusa Tenggara). Multiplier 0.85-0.95 vs satellite baseline.
Source: bmkg.go.id · cross-validated against 12 stations 2026-05-18
Electricity tariffs R-1/R-2/R-3/B-1/B-2/B-3 + capacitor charge + street-lighting levy + stamp duty. Updated Jan / Apr / Jul / Oct following PLN press releases.
Source: pln.co.id/pelanggan/tarif-tenaga-listrik · Q2 2026 active
Core Formula
One formula, four variables. No hidden multiplier, no “sales-figure efficiency” — every input is visible in the calculator output and can be overridden by advanced users.
Validation Framework
NASA POWER estimates are validated against PVGIS-ERA5 (European Commission Joint Research Centre) — a mean delta of 3.19% across a sample of 12 Indonesian coordinates, with a maximum delta of 6.8% per station.
Calculator output carries a ±10% confidence interval as a range rather than a single number — per the “Range over single” principle in our 6 operating principles.
All datasets and formulas are licensed CC-BY-4.0 — free to reuse by researchers, contractors, and academics, as long as the original source is credited.
Estimate results appear in <30 seconds. Or view the full methodology for an independent audit.