India is adding renewables at speed. So why is the power system asking more of coal?
India’s latest coal numbers sit rather awkwardly alongside the dominant narrative of its energy transition.
The Ministry of Coal’s latest press release reported that Coal India Limited’s (CIL) coal despatch to the power sector rose 6.1% during the first half of FY 2026-27, while domestic coal-based generation increased by 9.9%, from 582.5 BU to 640.05 BU. Of CIL’s total H1 offtake of 384.2 MT, 302.8 MT went to the power sector, underlining the continuing importance of coal to electricity supply.
The government’s own framing describes coal as part of an energy-security chain connecting mining, evacuation, generation and electricity availability, and says the objective is moving from higher offtake towards assured, predictable and quality-conscious supply.
In fact, recently, the Ministry of Power has invoked Section 11 of the Electricity Act to direct 112 captive coal-based generating stations of 50 MW and above to maximise generation between October and December 2026, with surplus electricity to be offered through the exchanges. Directions covering Tata Power’s 4,000 MW imported-coal-based Mundra plant have also been extended until December 31, 2026.
This is happening as India continues to add renewable capacity and invest heavily in transmission and battery storage.
There seems to be a contradiction. If renewable energy is becoming an increasingly important part of India’s electricity system, why is the system simultaneously leaning harder on coal?
The answer is somewhere between adding generation capacity and building a power system capable of using that capacity reliably.
Coal and the Reliability Equation
India’s electricity demand has been running ahead of some recent expectations. Actual power demand during April-August FY 2026-27 was reported to be 3.3% above CEA projections, while September recorded a peak demand of 269 GW, the highest for the month. At the same time, hydro generation was weaker than anticipated and the evening decline in solar generation placed additional pressure on the system.
These conditions become critical because electricity systems have to balance supply and demand continuously. Annual generation figures can tell us how much electricity a country produces; they tell us considerably less about whether enough power is available at a particular hour, in a particular region, when demand is high.
That is where coal continues to play a significant role.
CIL’s latest figures show that the increase in coal supply is translating into higher domestic coal-based generation. The company also points to better evacuation, synchronisation of production and despatch, and the utilisation of accumulated pithead stocks as factors behind the improvement.
None of this suggests that renewable growth has stalled. It demonstrates that, for a system in which demand continues to rise, dispatchable generation remains valuable, while the infrastructure required to operate with a much larger share of variable renewable energy is still being built.
This distinction is easy to lose when energy transition is described primarily as a contest between technologies.
Renewables Are Changing the Grid Around Them
The rapid growth of solar and wind is changing the operating conditions of the electricity system itself. Solar output can be substantial during the day and decline towards evening just as demand remains elevated; wind generation varies with weather conditions, while hydro availability depends on water conditions. The system consequently needs enough resources to manage these variations without compromising supply.
Some of that flexibility currently comes from conventional generation. With time, a larger share will need to come from storage, hydro, transmission, flexible thermal operation, demand response, and electricity markets that can properly value flexibility.
The investment being made around renewable generation reflects this shift. Green Energy Corridor Phase-III includes ₹1.36 lakh crore for intra-state transmission infrastructure to facilitate evacuation of 135 GW of renewable energy and ₹50,000 crore for 50 GWh of battery energy storage systems. The storage component is intended to address issues including intermittency, congestion, peak-hour curtailment, and demand during non-solar hours.
Ultimately, the value of a renewable-energy asset increasingly depends on the system surrounding it.
A solar plant can add 100 MW of installed capacity, but that does not mean the system has acquired 100 MW of power that can be called upon at any hour. Transmission determines where the electricity can go; storage can shift some of it across time; flexible resources can respond when renewable output falls or demand rises.
The distinction between capacity and capability is therefore becoming increasingly important to the way India thinks about its energy transition.
The Story We Tell About Energy Transition
For years, installed renewable capacity has been a natural measure of progress. It is visible, comparable and easy to communicate. Gigawatts added, non-fossil capacity installed, and the share of renewables in the generation mix provide powerful evidence of structural change.
But the power system experiences that change differently.
It responds to the timing of generation, the location of demand, transmission constraints, storage availability, weather conditions, ramping requirements and the ability of different resources to respond when forecasts prove wrong.
The recent developments expose the gap between these two ways of looking at energy transition.
India can strengthen coal supplies, direct captive plants to maximise generation, extend the operation of an imported-coal plant, and invest simultaneously in large-scale transmission and battery storage without those actions necessarily representing conflicting energy policies. They are responses to different requirements within the same electricity system.
This is where the energy-transition narrative needs greater maturity.
A coal-generation increase should not automatically be read as evidence that the transition is failing, just as a rise in renewable capacity does not by itself demonstrate that the system has become better equipped to absorb it. The more important question is whether India is building the capabilities that allow a changing generation mix to serve a growing economy reliably.
That requires a vocabulary broader than “coal versus renewables”. It requires a conversation about adequacy, flexibility, storage, transmission, demand, and the quality of system planning.
All those communicating energy transition to investors, regulators, policymakers, consumers, and other stakeholders, the distinction is significant. Simplifying the story into opposing technologies may make the message easier to deliver, but it can also obscure why apparently contradictory investments and policy interventions are occurring at the same time.
A more credible narrative starts with the power system rather than any single technology.
Moving From Capacity to Capability
India is, in effect, managing two timelines simultaneously.
One is the immediate requirement to keep electricity available as demand rises. That explains the continuing emphasis on coal supply, the mobilisation of captive generation and the use of available thermal capacity when the system comes under pressure. CIL itself describes reliable coal supply as an instrument of energy security.
The other timeline is the structural transformation of the electricity system: more renewable generation, stronger transmission networks, large-scale storage, greater flexibility, and market mechanisms capable of accommodating a more variable supply profile.
These timelines will overlap for years.
The success of energy transition will therefore depend on how effectively the second develops, while the first continues to secure reliability.
The objective is not to pretend that one can be switched off before the other is ready; it is to build the system in which the need for conventional sources to provide reliability can progressively decline as alternative sources of flexibility become available at scale.
That suggests a more useful measure of progress than renewable capacity alone.
How much clean electricity can India add, and how reliably can the system put it to work when consumers need it?
The answer will ultimately determine what energy security means in a renewable-heavy power system.
And it may also determine how India’s energy transition needs to be explained. Less as a race between coal and renewables, and more as the gradual transformation of an electricity system that has to keep the lights on while changing how it produces them.
As India adds more renewable capacity, should we start measuring the energy transition by how reliably the grid can use it, rather than by capacity additions alone?
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