India's 300 GW of Clean Power: Why 54% of Capacity Still Means Only 29% of Electricity

India crossed a line this week that looks, on its face, like a turning point. Non-fossil power capacity passed 300 gigawatts, Vice President C.P. Radhakrishnan announced on 5 November at the Bharat Renewable Energy Summit — more than 54% of the country's installed capacity of about 552 GW. Solar alone accounts for 164.59 GW, more than half the total. For scale: India's entire power fleet, fossil and all, stood at 249 GW in 2014. The clean fleet alone is now bigger than the whole system of twelve years ago.

But the second number in the story is the one that matters, and it is much smaller. In 2025-26, non-fossil sources supplied 538.97 billion units of electricity — 29.2% of generation. Coal still supports more than 70% of generation and nearly 55% of primary energy. The gap is not an accounting trick; it is physics. Capacity measures what a plant could produce at full output. Generation measures what it did. A solar plant works only in daylight and a wind farm only when the wind blows, so each delivers a much smaller share of its rated capacity across a year than a coal unit that can run day and night — and demand peaks in the evening, just as solar stops.

That gap is the whole argument of the next four years. India's formal goal is 500 GW of non-fossil capacity by 2030, and the arithmetic looks forgiving: reaching it needs about 200 GW more in 53 months, roughly 3.8 GW a month, against a recent pace of 4.3 GW a month — 17 GW arrived in the four months to July. The country also reached 50% non-fossil capacity years ahead of its 2030 pledge, and under the nationally determined contribution for 2031-35 submitted this year it aims for about 60% non-fossil capacity by 2035. On capacity, India is ahead of schedule.

The constraints now sit elsewhere, and three of them weigh more than the build rate. Storage first: solar peaks at midday while demand peaks in the evening, and installed battery capacity above 1 MWh stood at about 8.66 GWh on 30 June 2026 against a projected need of 411 GWh of grid-scale storage by 2031-32. The Cabinet has cleared a 92 GWh storage scheme, but that still leaves most of the gap to close. Transmission second: the best solar and wind sites are often far from the cities and factories that need the power, and capacity that cannot reach the grid does not displace coal. Demand and coal third: electricity demand keeps growing, so renewables are at present meeting much of the new load rather than displacing existing coal, and the government still treats coal as central to energy security — India is the world's second-largest coal producer, with output of 1,040.08 million tonnes in 2025-26.

So the number to follow from now on is not the capacity total but the generation share, published monthly and annually by the Central Electricity Authority. My call is that in the current fiscal year, 2026-27, non-fossil sources reach at least 31% of generation, up from 29.2%. The case for it is the full-year effect of last year's record build — 55.29 GW of non-fossil capacity added in FY26, including 44.61 GW of solar — which will be generating for all twelve months of this year rather than part of it. The case against it is the storage shortfall and the evening peak, which cap how much of that solar actually displaces coal, plus hydro, which depends on water and season. I put it at 50%: a genuine coin flip, and the honest one, because the two forces are almost evenly matched and the data will settle it.

If the share moves from 29% toward 31% and beyond, the transition is reaching the grid. If capacity keeps rising while the share stays flat, it is not — and the 300 GW milestone will have been a record of building, not of changing what India burns. That is the test the next few years will run, and the generation share is where it will show up first.