India Gas Power Output Surges 80% as Coal Plants Hit Limits

India’s reliance on natural gas for electricity generation spiked 80.32% during the first nine days of September, driven by a critical shortfall in evening supply. This surge reflects a structural shift in the grid’s operational strategy, where gas turbines are now being deployed as the primary balancing mechanism to cover peak-hour deficits.

The National Power Portal data indicates that gas-based plants generated 1,088.64 million units (MU) between September 1 and 9, a significant increase from 603.70 MU in the same period last year. This operational pivot is necessitated by the inability of other fuel sources to scale output rapidly, leaving gas as the only viable option for meeting sudden demand spikes.

Coal capacity constraints limit grid flexibility

Coal-fired power plants are operating at near-maximum levels, with load factors on imported coal units exceeding 70%. A senior government official noted that there is no remaining headroom to increase thermal generation, as most plants are already running at their physical limits. This saturation means the grid cannot rely on coal to absorb the evening demand peak.

Furthermore, over 37 GW of coal-based capacity is currently under planned or forced maintenance. Planned maintenance, typically scheduled for April and May, has been deferred to ensure supply continuity amid earlier gas constraints. This backlog of deferred maintenance has now reached a point where further delays are operationally difficult, reducing the available thermal capacity during this critical period.

Simultaneously, hydropower generation has declined due to rainfall deficits in southern and western India. Low reservoir levels have constrained hydro output, removing a significant portion of the flexible generation capacity that would otherwise complement coal and gas. This dual constraint on coal and hydro forces the grid to depend heavily on gas turbines for peak shaving.

Gas purchases soar despite price spikes

Natural gas purchases by the power sector jumped to 30,53,300 MMBtu between September 1 and 10, compared with just 3,75,000 MMBtu in the same period last year, according to Indian Gas Exchange data. This tenfold increase in volume highlights the extent to which the power sector is drawing on spot market gas to meet immediate demand.

The surge in volume has coincided with a sharp rise in costs. The average spot gas price increased by 139%, from Rs 1,013/MMBtu to Rs 2,420/MMBtu. While gas-based generation is more expensive than coal, its operational flexibility allows it to ramp up and down quickly, making it essential for managing the volatility in evening demand when solar output falls.

Evening demand peaks drive operational shifts

The government currently relies on 4.5 to 5.5 GW of gas-based power to meet the evening shortfall. On September 9, peak demand reached 267 GW with a night-time shortfall of 7.7 GW, while on September 10, demand hit 269 GW with a 6.1 GW shortfall. These figures underscore the critical role gas plays in bridging the gap between supply and demand during peak hours.

India’s total installed gas-based capacity stands at 20.1 GW, a small share of the overall mix but a crucial component for grid stability. The unusual surge in September demand, nearing summer peaks, has tested the limits of the current generation mix. Officials expect the demand surge to taper off after mid-September, but the current reliance on gas highlights the vulnerability of the grid to simultaneous constraints in coal and hydro resources.