Solapur Factory Cuts Power Bills by ₹5 Million Annually with Rooftop Solar

A manufacturing facility in Solapur, Maharashtra has reduced its annual electricity expenditure by ₹5 million — approximately ₹417,000 per month — after switching to rooftop solar power, underscoring the compelling financial case for commercial and industrial (C&I) solar adoption across India. The installation allows the factory to generate a significant share of its electricity on-site, dramatically cutting dependence on grid power sourced from Maharashtra's distribution companies (DISCOMs), where industrial tariffs have climbed steadily over the past five years. For energy-intensive manufacturers, electricity costs can consume anywhere between 15 and 30 percent of total operating expenses, making rooftop solar one of the fastest-returning capital investments available today. This case from Solapur — a city historically known for its textile and sugar industries — signals a broader shift happening in India's industrial heartland, where factory owners are no longer waiting for policy mandates to go solar. They are doing the math themselves, and the numbers are decisively in favour of clean energy.

Why Are Indian Factories Turning to Rooftop Solar Now?

The economics of rooftop solar in India have never been stronger. The cost of solar photovoltaic modules has fallen more than 90 percent over the past decade, with benchmark module prices now hovering below ₹18 per watt for domestically manufactured panels. Coupled with the government's Approved List of Models and Manufacturers (ALMM) framework and the Production Linked Incentive (PLI) scheme for solar manufacturing — which is expected to add over 65 GW of integrated solar module capacity domestically — C&I buyers now have reliable access to quality equipment at competitive prices. For a factory like the one in Solapur, a rooftop system sized between 500 kW and 2 MW would typically generate enough units to offset a substantial portion of daytime load. At Maharashtra's prevailing industrial tariff of roughly ₹9–₹11 per unit, every kilowatt-hour generated on-site translates directly into rupees saved. With system costs for C&I rooftop projects currently ranging from ₹45 to ₹60 lakh per MW, payback periods have compressed to four to six years — making the return on investment difficult to ignore.

Beyond pure economics, Maharashtra's net metering policy allows factories to export surplus solar generation back to the grid, earning credit against future electricity bills. MNRE's revised net metering guidelines, updated in 2022, permit systems up to 500 kW to net-meter freely, while larger installations can access gross metering or group captive arrangements. These regulatory enablers have materially de-risked the rooftop solar proposition for medium and large industrial units across Maharashtra, Rajasthan, Gujarat, Tamil Nadu, and Karnataka — states where industrial electricity demand is highest.

How Much Can Indian Industries Save with Rooftop Solar?

The ₹5 million annual saving reported by the Solapur factory is not an outlier — it is increasingly the norm for mid-sized industrial units that size their rooftop systems correctly. Across India, the Ministry of New and Renewable Energy (MNRE) estimates that the country's rooftop solar capacity crossed 11 GW as of early 2025, with C&I installations accounting for roughly 60 percent of that total. National-level developers including Amplus Solar, Fourth Partner Energy, CleanMax, and Avaada Energy have built portfolios of hundreds of megawatts of rooftop and ground-mounted captive solar assets specifically for industrial clients, offering zero-capital OPEX or RESCO models where the factory pays only for units consumed — typically at a discount of 20–30 percent to grid tariff. For a factory running two shifts in a high-tariff state like Maharashtra or Tamil Nadu, the annualised savings can range from ₹30 lakh to well over ₹1 crore depending on system size, load profile, and the prevailing DISCOM tariff. The Solapur facility's ₹5 million saving figure sits squarely within this range and serves as a credible benchmark for peer industries evaluating similar projects.

The PM Surya Ghar: Muft Bijli Yojana scheme, launched in February 2024 with a ₹75,000 crore outlay, is primarily targeted at residential consumers, but its underlying ambition — to mainstream rooftop solar across India — is creating a policy environment that also benefits the C&I segment. Increased awareness, better installer networks, and faster DISCOM approvals are downstream effects of the scheme that industrial adopters in cities like Solapur, Pune, Nashik, and Aurangabad are already benefiting from.

What This Means for India's Energy Transition

India's target of 500 GW of renewable energy capacity by 2030 — anchored by the National Electricity Plan 2023 — cannot be achieved on the back of utility-scale solar parks alone. Rooftop and distributed solar must contribute meaningfully, and MNRE has set a specific 100 GW rooftop solar target within the broader 500 GW goal. With installed rooftop capacity still below 12 GW today, a near-tenfold scale-up is required in five years. That ambition depends on exactly the kind of organic, market-driven adoption playing out in Solapur — factory owners responding to genuine financial signals rather than subsidies alone. Each industrial unit that commissions a rooftop system reduces strain on state DISCOMs, lowers peak demand from thermal sources, and demonstrates to neighbouring industries that the transition is both technically straightforward and financially rewarding. The aggregate effect, multiplied across thousands of factories in Maharashtra, Gujarat, Tamil Nadu, and Andhra Pradesh, is material to India's decarbonisation trajectory.

Watch for MNRE's updated Rooftop Solar Phase III guidelines expected later in 2025, which are likely to raise system size thresholds for net metering and potentially introduce incentives for battery storage paired with rooftop installations. States like Rajasthan and Karnataka are also finalising revised DISCOM open access frameworks that could further accelerate C&I solar uptake. For India's industrial sector, the rooftop revolution is no longer a future prospect — it is a present-tense financial decision being made on factory floors from Solapur to Surat.