Renewable energy plan (corporate Calculators tab)

kWp = floor(roof m² ÷ density); generation MWh = min(kWp × yield × 0.95 ÷ 1000, target MWh)

Roof area holds panels at a density by roof type; generation is capped at the target.

• roof m²
  Usable roof (prefilled as built-up sq ft × 0.0929 × 0.4) · m²
  Your data
• density metal
  Roof area per kWp, metal roof · m² / kWpIndia: 6.5 m² per kWp · Ploxi engineering assumptionpending review
  Factor table
• density RCC
  Roof area per kWp, RCC roof · m² / kWpIndia: 7.5 m² per kWp · Ploxi engineering assumptionpending review
  Factor table
• density mixed
  Roof area per kWp, mixed roof · m² / kWpIndia: 7 m² per kWp · Ploxi engineering assumptionpending review
  Factor table
• yield
  Specific yield · kWh / kWp·yrIndia: 1,560 kWh per kWp per year · World Bank/ESMAP Global Solar Atlas (Solargis model v2.2.68, data to 2025) — PVOUT at 10 Indian metros (2026) [medium confidence]↗ sourcepending review
  Factor table
• PR
  Performance ratioIndia: 0.95 share (0-1) · Ploxi engineering assumptionpending review
  Factor table
• target %
  Target renewable share of load · %
  Your data

OA MWh = eligible ? min(target − rooftop, (load − rooftop) × 0.75) : 0; I-REC MWh = target − rooftop − OA

Open access needs an open-access market and at least 100 kVA contract demand, and covers at most 75% of what rooftop leaves. I-RECs close the rest of the target.

• load
  Annual electricity load (prefilled from metered months) · MWh
  Your data
• contract kVA
  Contract demand (prefilled: avg load ÷ 0.65 ÷ 0.9 × 1.1) · kVA
  Your data
• OA threshold
  Minimum contract demand for green open access · kVAIndia: 100 kVA · Electricity (Promoting Renewable Energy Through Green Energy Open Access) Rules, 2022 — G.S.R. 418(E), MoP, 6 Jun 2022 (2022)↗ sourcepending review
  Factor table
• OA cap
  Max share of remaining load on open accessIndia: 0.75 share (0-1) · Ploxi engineering assumptionpending review
  Factor table
• regions
  Which regions have an open-access marketValue used: 6 Indian states listed; any other Indian state yes; Madagascar, Mauritius and other countries no
  Ploxi assumption

S2 today = (load − renewable now) × grid; S2 after = (load − target) × grid; rooftop saving = MWh × 1000 × tariff; payback = capex ÷ saving; OA saving = MWh × 1000 × OA saving; I-REC cost = MWh × REC price

Everything inside the target counts as zero emissions after the plan (market-based).

• grid
  Grid factor for the site's country · t CO₂e / MWhIndia: 0.675 kg CO₂e / kWh · CEA CO2 Baseline Database for the Indian Power Sector v22.0 (Aug 2026), Table S (2026)↗ sourcepending review
  Factor table
• tariff
  Grid tariff · per kWhIndia: 9 INR per kWh · MERC MSEDCL MYT Order (Case 217 of 2024) press note — Annexure 1 approved HT-I Industry ABR; MPERC FY2025-26 Retail Supply Tariff Order Table 93; MERC TPC-D MYT press note (2025-26) [medium confidence]↗ sourcepending review
  Factor table
• capex
  Solar capex · per WIndia: 35 INR per W · CSERC Generic RE Tariff FY2025-26 (Suo-motu Petition 101 of 2025) — normative capital cost solar PV 0.5-2 MW ₹3.5 Cr/MW; corroborated by CTUIL/CEA benchmark (Sep 2026) ₹3.5 Cr/MW and MNRE GCRT benchmark (OM 21-Jul-2020) ₹36/W for 100-500 kW (2025-26) [medium confidence]↗ sourcepending review
  Factor table
• OA saving
  Open-access saving · per kWhIndia: 3 INR per kWh · Ploxi declared basis: 25–35% landed saving under green open access (kept). Research derived ~₹1.5/kWh from IEX G-DAM + CSS with assumed wheeling/banking (low confidence; state-specific ₹0.5–3).pending review
  Factor table
• REC
  I-REC price · per MWhIndia: 65 INR per MWh · Ploxi declared basis: indicative India I-REC price (kept). Research found only the domestic Indian REC on IEX (~₹360/MWh, Aug 2026) — a different instrument; India I-RECs trade OTC with no official price.pending review
  Factor table
• equity
  Captive SPV equity (26%) · INR per MWh·yrIndia: 1,140 INR per MWh per year · Ploxi declared costpending review
  Factor table
• fallbacks
  Used only if the economics rows are missingValue used: tariff ₹9/kWh · OA ₹3/kWh · yield 1,550 · capex ₹38/W · I-REC ₹65/MWh
  Ploxi assumption