Whalesbook
The Emerging Grid Imbalance
India's ambitious renewable energy expansion is introducing significant turbulence into its power grid. While record additions of solar and wind capacity are critical for decarbonization goals, they are also causing unprecedented oscillations and stability issues. Central Electricity Authority (CEA) Chairperson Ghanshyam Prasad highlighted that the grid's absorption capacity for renewable power has been tested, partly due to weaker-than-anticipated demand last year. Persistent rains between April and October 2025 kept peak demand at 245 GW, falling short of the projected 270 GW. This mismatch between generation and demand absorption exacerbates grid management challenges.
Thermal Plants Under Pressure
The operational flexibility required from thermal power plants to accommodate intermittent renewables is creating a crisis of viability for the sector. Thermal plants have historically been reluctant to reduce their Plant Load Factor (PLF) below 55% due to efficiency concerns and the associated financial implications. However, with renewable energy sources increasingly dictating grid operations, thermal PLFs have fallen sharply; the national average PLF declined from 77.5% in 2009-10 to 53.37% by 2021-22. This decline is projected to continue, potentially falling to 40% in the coming years. Such low utilization can reduce a thermal plant's Return on Equity by up to 26% under regulated tariff regimes, making them financially precarious. The effective cost of coal power is estimated to rise by nearly 25% as fixed costs are spread over fewer generation units.
Transmission Bottlenecks and Systemic Risks
The rapid pace of renewable capacity additions, with 52 GW installed in the first ten months of the financial year, is outpacing the development of adequate transmission infrastructure. Over 50 GW of renewable capacity was reportedly stranded across India as of June 2025 due to transmission constraints, leading to project delays and increased costs. The Central Electricity Authority (CEA) is revising transmission plans more frequently, aiming to integrate 600 GW of renewables by 2032, backed by a ₹2.4 lakh crore national transmission program. Despite these efforts, a significant gap persists between generation potential and evacuation capacity, risking stranded assets and driving up transmission charges.
The 'Duck Curve' and Flexibility Mandates
The grid is increasingly experiencing a pronounced 'duck curve,' characterized by a surplus of renewable energy during midday and steep ramp-up requirements in the evenings as solar output diminishes. To manage this, a CEA committee has recommended that thermal power plants operate at a minimum technical load (MTL) of 40%, down from the customary 55%, and explore two-shift operations. Procedural adjustments are deemed technically feasible to enable this greater operational flexibility, which is crucial for higher renewable integration during peak solar and wind output periods [cite: Source A]. A scheme to financially incentivize such flexibility in thermal plants has been recommended to the Ministry of Power.
Policy Evolution and Regulatory Gaps
Recognizing the evolving energy landscape, India's 2005 Electricity Policy is scheduled for revision by mid-2026, coinciding with the expected passage of the Electricity Bill [cite: Source A, 35]. This policy overhaul is critical for aligning with current realities, including the need for flexible thermal operations. Furthermore, adherence to grid standards remains a concern, with instances of grid oscillations originating in one region impacting distant locations [cite: Source A]. Critically, state electricity commissions are reportedly yet to fully adopt compensation principles laid down by the Central Electricity Regulatory Commission (CERC) for grid disruptions or part-load operations, potentially leaving thermal generators exposed to uncompensated financial losses.
The Bear Case: Stranded Assets and Financial Distress
The primary risk lies in the growing disconnect between rapid renewable capacity addition and the grid's ability to absorb this power, coupled with insufficient transmission expansion. This disconnect threatens to strand renewable assets and deepen the financial distress of thermal power operators forced into sub-optimal operating conditions. The significant drop in PLFs, coupled with the potential for reduced efficiency at lower loads, directly impacts the profitability and long-term viability of thermal plants, which are financed heavily through debt. Without a synchronized build-out of transmission and storage, coupled with a clear financial framework for flexible thermal operations, the reliability of the grid and the financial health of key energy sector players are at risk. Furthermore, delays by state commissions in adopting CERC guidelines on compensation for grid operations and part-load operations could exacerbate financial pressures on thermal generators.