Can India Ditch Coal? Why Thermal Power Remains the Backbone of Grid Stability in 2026

The debate over India’s energy transition is often presented as a choice between coal and renewables. The operating reality is more complex. Non-fossil sources now represent over 52% of installed capacity, yet thermal plants still delivered roughly 70-75% of the country’s electricity generation in 2026. This gap reflects the difference between nameplate capacity and dependable output, rather than policy inconsistency.

Source: CEA, Ministry of Power, Equirus Research Report

The Reliability Gap

Solar and wind are essential to India’s long-term expansion because they can be commissioned rapidly, reduce fuel exposure and provide low-cost electricity during favourable hours. However, power demand is growing at 7-8% annually, while each gigawatt of renewable capacity contributes materially less dependable output than a gigawatt of dispatchable thermal capacity. Solar generation falls to zero after sunset, precisely when demand remains elevated, and wind output varies with weather. At 4 a.m., India’s net load is only around 10% below the evening peak, compared with roughly 30% in California, requiring firm capacity to remain available throughout the night.

Why Thermal Remains Essential?

This gap gives thermal power a continuing system role. Coal plants provide the large dispatchable base required to meet industrial, residential and agricultural consumption when renewable output is unavailable, while also supplying critical ramping flexibility. On India’s record peak-demand day of 21 May 2026, when demand reached 271 GW, coal delivered around 45 GW of ramping support and operated at approximately 92% of available capacity as solar faded. Total dispatchable utilisation reached about 90% at peak, leaving limited margin for error and highlighting the system’s dependence on thermal flexibility.

Storage will eventually reduce the need for thermal balancing, but firm and dispatchable renewable energy projects paired with storage remain at an early stage of deployment on a scale. Battery projects are growing quickly and pumped-storage projects can offer longer-duration flexibility, yet both require capital, approvals, equipment and viable revenue mechanisms. Until storage is deployed at scale, coal remains the only proven technology capable of supporting the grid across extended non-solar hours.

Alternative baseload sources also face constraints. Nuclear power contributes only around 2.8% of generation and has long construction schedules, with the first unit of the Mahi Banswara project expected only by 2032. Large hydro can provide valuable flexibility, though projects are exposed to environmental approvals, land challenges, monsoon dependence and hydrological variability. Gas generation can respond quickly, but fuel availability and price have historically limited utilisation.

Policy Support and Capacity Expansion

Policy has adjusted to these realities. India’s original thermal-capacity target of around 80 GW by 2032 has been revised to approximately 97 GW by 2034-35. Around 18 GW has been commissioned since 2023 and roughly 40 GW is under construction, with additional capacity awarded or planned. New projects are increasingly based on supercritical or ultra-supercritical technology, which improves efficiency and reduces coal consumption per unit of electricity relative to older plants. Thermal generation also benefits from India’s large domestic coal base, offering greater fuel security than the import-dependent equipment supply chain supporting the solar sector.

Source: Ministry of Power

The Bottom Line

For investors, however, “thermal remains relevant” should not be interpreted as a blanket endorsement of every coal project. The previous cycle demonstrated how quickly value can be destroyed when plants lack fuel linkages, long-term power purchase agreements or financially credible buyers. A thermal asset with a secure fuel supply, a cost-pass-through mechanism and contracted offtake is fundamentally different from a merchant project exposed to fuel and price volatility.

Flexibility will also separate stronger assets from weaker ones. Plants capable of operating at lower technical loads and ramping efficiently may become more valuable as renewable penetration rises. This can require additional capital expenditure and may affect maintenance, but it aligns thermal generation with the grid’s emerging needs.

The energy transition is therefore not a straight line from coal to solar. It is a staged redesign of the power system in which renewables provide most incremental capacity while thermal, hydro, nuclear and storage protect reliability. Coal’s share of installed capacity may decline over time, but its contribution to system security will remain important for longer than simple capacity charts imply.

The investment conclusion is one of selectivity. Thermal assets should be valued according to contract quality, fuel security, operational flexibility and regulatory treatment. In a renewable-led system, the strongest coal plants may not be those that run continuously; they may be those that can respond reliably when the sun goes down.