Electricity rate assumed at ₹8.0/unit to convert your bill into monthly consumption (skip this by entering usage directly).
System size = daily consumption ÷ your state's average daily peak sun hours, rounded to the nearest 0.5 kWp.
Panels assumed at 540 Wp each; roof area assumed at ~100 sq ft per kWp of capacity.
Installed cost assumed at ₹55,000 per kWp (on-grid residential/commercial benchmark, before subsidy).
Central subsidy modelled on the PM Surya Ghar Muft Bijli Yojana slabs for residential rooftops: ₹30,000/kW for the first 2 kW, ₹18,000 for the 3rd kW, capped at ₹78,000 for systems 3 kW and above. Not applicable to commercial properties.
14 states/UTs currently layer an additional top-up on the central subsidy (marked ★ in the state list) — these generally apply only up to 3 kW and sometimes to specific income groups or beneficiary lists, as noted under the result once selected. The other states and UTs currently offer the central subsidy only.
State top-up figures are drawn from state nodal agency (e.g. UPNEDA, GEDA, RREC) and DISCOM summaries as of August 2026 — these change often, so confirm the live slab for your DISCOM under "State Scheme" at pmsuryaghar.gov.in before budgeting.
Annual generation = system size × peak sun hours × 365 × 0.80 performance ratio (accounts for inverter, wiring and soiling losses).
CO₂ offset uses India's grid emission factor of ~0.82 kg CO₂/kWh; tree-equivalence uses ~21 kg CO₂ absorbed per mature tree per year.
All figures are planning-stage estimates only — actual quotes depend on your roof, shading, sanction load and local DISCOM rules.
