By Arpit Jain, Chief of Staff, Hexa Climate
“Clean energy transitions are won not by how much capacity is built, but by how reliably it is delivered.”
India stands at a pivotal juncture in its power‑sector transformation. Just recently, the country crossed a milestone: more than half of its installed electricity capacity now comes from non‑fossil fuel sources. As of June 30, 2025, India’s total installed capacity stood at approximately 484.82 GW, of which about 242.78 GW (50.1 per cent) was from non‑fossil sources including renewables, large hydro and nuclear.
This achievement arrives five years ahead of India’s stated 2030 target. Yet this capacity milestone, while significant, is only the beginning. The more demanding task lies in making clean energy not just present in the system, but contractually reliable, timely and dispatchable. In other words, the renewable transition is no longer about sheer MWs — it is about guaranteed delivery.
At the heart of this shift lies the power purchase agreement (PPA). In earlier phases, PPAs for solar or wind were premised on the assumption of availability when nature allowed: sunny days, windy nights. Today, the market is moving into a phase of round‑the‑clock and firm & despatchable renewable energy contracts that demand supply aligned with demand, not just generation. Renewable energy must behave more like baseload and less like an occasional contributor.
This evolution is driven by both demand‑side expectations and a more stringent policy context. India has pledged to install about 500 GW of non‑fossil capacity by 2030 and achieve net zero emissions by 2070. These are ambitious goals that require renewable power to replace fossil‑backed reliability — meaning clean energy must be available during evening peaks, industrial shifts and grid stress events.
However, despite the encouraging capacity numbers, a critical contractual bottleneck now threatens to slow progress. As of September 30, 2025, Indian renewable energy implementing agencies had issued Letters of Award for about 44 GW of capacity for which PPAs have not yet been signed with end procurers/discoms.
These delays matter. Without a signed PPA, projects cannot achieve financial closure — land, equipment and grid connection plans stall, and inflation and supply risk rise. Unsigned PPAs signal counter‑party risk, increasing cost of capital. And when contracts remain open, renewable cost advantages erode under delay‑driven overheads.
At a system level, the situation is urgent. With roughly 242.78 GW of non‑fossil capacity in place today, India still needs to add around 258 GW more by 2030 to hit the 500 GW mark. This implies sustaining annual additions of 50‑60 GW through the remainder of the decade. The difference between progress and slippage will be measured in contract signings as much as in capacity installations.
Globally, the landscape is also moving. US, Europe and China are rapidly adopting hybrid‑plus‑storage systems, long‑duration batteries and market mechanisms that reward firm clean power. India cannot treat renewable deployment as a volume game alone; it must treat it as a performance game.
The PPA is increasingly the mechanism through which this performance is secured. Modern renewable PPAs now include features such as hourly availability guarantees, minimum despatch windows, storage backing and performance penalties tied to delivery. They treat renewable plants less as capacity assets and more as reliability providers.
To clear the path ahead, several reforms are required. Tariffs discovered through competitive bidding must remain stable and not be reopened retrospectively. Contract signing timelines must be enforced. Pooled procurement could reduce load risk on financially stressed distribution companies. Developers should be enabled to participate in day‑ahead and real‑time markets to monetize surplus generation.
Meanwhile, developers must evolve. The market will reward companies that design renewable portfolios combining solar, wind and storage to match customer load curves, rather than natural resource curves. Their product is not power. Their product is reliability.
India’s milestone of achieving 50 per cent non‑fossil capacity is important. But its real test lies ahead: ensuring clean power is firm, timely and trusted. The future of India’s grid will be determined not only in tenders and auctions, but in the clauses and certainty of every PPA. In that fine print lies the country’s net‑zero moment.
