India stood at 551.99 GW of installed capacity on 31 July 2026, and non-fossil sources passed 300 GW — about 54% of the fleet, and already beyond 60% of the 500 GW non-fossil target set for 2030. Peak demand set a record 270.8 GW on 21 May 2026 and is expected to approach 300 GW as data centres, EVs and air conditioning compound. Read the chain top to bottom, but note where the money sits: the substation equipment makers at stage 7 are collectively worth more than most of the generation fleet, while stage 8 — the part that actually collects the cash — is largely uninvestable. Tap any stage to open it, then any company for detail.
At the head of this chain
Highest return on capital and fastest sustained sales growth among the 73 listed companies in this chain above ₹1,000 Cr market cap and ₹500 Cr revenue. Sustained growth is the lower of the 3-year and 5-year sales CAGR, so a single strong year cannot win it — Emmvee Photovoltaic compounded 101.4% over three years and 64.1% over five. Same rule on every map. Snapshot 8 Sep 2026.
How the Indian power sector works
Eleven stages from the coal seam to the plug. The weakest link collects all the cash.
- Margin pool
- Highest at substation equipment — GE Vernova T&D earns 77.4% on capital and Siemens Energy India 67.8%, selling into a national grid rebuild. Lowest at distribution and retail supply, where state discoms have been loss-making for decades. The stage that collects every rupee from consumers is the one that cannot make money.
- Bargaining power
- Sits with the equipment makers right now: transformer lead times are years long globally and Indian capacity is cheap. Generators have little power — they sell to a monopsony discom on a regulated tariff.
- Demand or supply led
- Supply-led and policy-driven. Capacity is built to central plans and PPAs, not to price signals. Demand is now the constraint at the margin: peak demand hit a record 270.8 GW on 21 May 2026 with data centres and cooling driving it.
- Who owns the customer
- The discom owns the billing relationship and almost nobody else touches the consumer. That is exactly why after-meter players — rooftop solar, EV charging — are strategically interesting: they are the first credible route past the discom.
- Barriers to entry
- Lowest in solar EPC and rooftop — contracting with modest capital. Highest in transmission and distribution licences, which are regulated monopolies awarded by the state, and in substation equipment, where qualification and lead times protect incumbents.
- Threat of substitutes
- Rooftop solar substitutes grid supply for exactly the commercial and industrial customers whose tariffs cross-subsidise everyone else. Storage substitutes peaking generation. Neither is large yet; both attack the most profitable customers first.
This is a generalist read of how the industry typically works, not a rule. Anomalies exist at every stage — a well-run company in a poor part of the chain routinely beats a badly-run one in a good part, and structure changes with the cycle. Use it as a starting frame, not a conclusion.
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