India's Solar Capacity in 2026: 171 GW and What It Means for Your Business

The numbers in one place

India's solar build-out keeps setting records. The Ministry of New and Renewable Energy (MNRE) publishes cumulative installed capacity every month, and its table for 30 September 2026 shows 171.05 GW of solar. That is up from 150.26 GW on 31 March 2026 and 164.59 GW on 31 July 2026, and roughly 30 GW more than the 140.6 GW MNRE reported for January 2026.

Two trends stand out. Rooftop solar, long the laggard, has accelerated sharply thanks to PM Surya Ghar for homes and to factories and commercial buildings cutting their power bills. And ground-mounted plants keep growing through utility tenders and through companies building captive and open-access plants for their own use.

Why India is building so fast

The direction is set at the highest level. At COP26 in Glasgow in 2021 the Prime Minister announced the Panchamrit commitments, the first of which is 500 GW of non-fossil electricity capacity by 2030. Non-fossil sources passed half of India's installed power capacity in June 2025, five years ahead of the original goal.

Policy then makes solar cheaper and easier to adopt:

• GST on solar equipment fell from 12% to 5% from 22 September 2025, lowering the upfront cost of every plant (see our GST guide).
• Accelerated depreciation lets a business that owns its plant write off the cost quickly (see depreciation explained).
• PM Surya Ghar subsidises rooftop solar for homes and PM-KUSUM solarises farms and feeders.
• Green Energy Open Access rules let consumers with as little as 100 kW of load buy green power from plants elsewhere.
• ALMM and import duties steer buyers towards Indian-made modules and, since 1 June 2026, Indian-made cells.

For a business the economics are now simple: a well-built plant on your own roof or land produces power for 25 years at a cost per unit well below most commercial and industrial grid tariffs, and the cost of the plant is recovered in a few years.

Where the growth is coming from

Utility-scale parks and tenders

Large solar parks, such as the 300 MW SECI project at Koppal in Karnataka where Arrays Ingenieria has done pile foundations and DC installation, still account for most new megawatts. New tenders increasingly ask for co-located battery storage (see storage with solar).

Commercial and industrial (C&I) rooftops

Factories with large sheet roofs are among the best sites in the country: the roof already exists, consumption is during the day and tariffs are high. Our rooftop work runs from small commercial roofs to multi-megawatt industrial sheds, at smelters, steel and textile plants, consumer-goods units and retail warehouses.

Tea estates and agro-industry

Assam's tea gardens have become a solar story of their own: estates with steady daytime factory load, diesel-generator back-up and spare land are building ground-mount plants. The Chief Minister of Assam inaugurated our 595 kWp plant at Koomber Tea Estate on 1 October 2026 (see solar for Assam's tea estates).

What this means if you are planning a plant

Record volumes are good news for prices and choice, but they create bottlenecks in three places:

1. Skilled installation crews. Experienced installation & commissioning teams, piling rigs and supervisors are booked months ahead in the peak season.
2. Approvals. DISCOM feasibility, net-metering or open-access approval and the Electrical Inspector's (CEIG) inspection all take time, and queues grow when everyone builds at once.
3. Compliant equipment. ALMM-listed modules (with List-II cells for covered projects) and BIS-certified inverters must be specified and documented from the start.

The practical answer is to start early and choose a partner who has done the work before, at scale and with documents to show for it. Ask for case studies, client certificates and references; our checklist of 12 questions to ask a solar EPC is a good place to start.

How Arrays Ingenieria fits in

Arrays Ingenieria is an ex-servicemen-led solar EPC and installation & commissioning (I&C) company. We build on the CAPEX model, where you own the plant, and we work as the installation partner for EPC majors and developers. Our work runs Pan-India: tea-estate ground-mount plants in Assam, industrial rooftops in West Bengal, Odisha, Bihar, Haryana and Uttarakhand, and piling, fencing and civil works on utility-scale projects.

Frequently asked questions

Sources

1. MNRE: Physical progress, cumulative as on 30 September 2026
2. MNRE on X: solar capacity 140.6 GW as of January 2026
3. PIB: India ranks third globally in renewable energy installed capacity
4. SolarQuarter, 12 Aug 2026, citing MNRE data
5. PIB: PM's national statement at COP26, 1 Nov 2021

This guide explains public policy in plain language for planning purposes. Rules, rates and deadlines change: confirm the current position with the notifying authority, your DISCOM and your tax adviser before you commit. Last checked 11 Oct 2026.