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India May Need More Coal While Solar Is Being Curtailed: What CEA's Warning Means for Rajasthan
India is expanding renewable-energy capacity rapidly, yet the Central Electricity Authority's chairperson indicated on 13 October 2026 that faster-than-expected electricity demand may require more coal-based generation than previously envisaged. This is not proof that renewables have failed. It is a reason to examine when and where dependable electricity is needed, how transmission constraints affect delivery, and how generation, storage and demand flexibility can work together.
What Did the CEA Chairperson Say?
Contemporary reports of Ghanshyam Prasad's remarks differ: Reuters described a possible additional requirement of approximately 105–150 GW, while another report described about 115 GW. These are preliminary reported figures, not a verified final replacement plan or an approved 150 GW target. The planning reference and treatment of retirements must be clarified before drawing conclusions.
What Was the Earlier 97 GW Reference?
A Ministry of Power parliamentary response dated 9 February 2026 discussed approximately 97 GW of additional coal and lignite capacity, using a March 2023 installed-capacity reference and projecting approximately 307 GW of thermal capacity by 2034–35. Gross additions from a historical baseline cannot simply be compared with a later total installed-capacity projection without accounting for commissioning, retirements and reference dates.
CEA's March 2026 National Generation Adequacy Plan
CEA's National Generation Adequacy Plan released 19 March 2026 projects approximately 1,121 GW of total installed generation capacity by 2035–36. The model includes 509 GW solar, 155 GW wind, 315 GW coal, 22 GW nuclear, 78 GW large hydro, 20 GW gas, 16 GW biomass and 6 GW small hydro. It also envisages 80 GW/321 GWh battery storage and 94 GW/567 GWh pumped storage, with peak demand projected around 459 GW. These are model projections, not guaranteed commissioning or binding construction commitments.
Why Electricity Demand Is Harder to Predict
Industrial activity, cooling requirements, agricultural consumption, electrification, weather and new electricity-intensive businesses can alter annual consumption and critical-hour demand. Heatwaves and weak monsoons may simultaneously increase demand and reduce hydro availability. Resource adequacy must test difficult operating periods rather than average conditions alone.
Why Installed Megawatts Are Not Equivalent
Solar generation varies with sunlight; conventional generation can be dispatched at night but is subject to fuel, maintenance and outage risks. One megawatt of solar and one megawatt of coal do not necessarily contribute the same dependable power during a specific evening peak. Planners use capacity credit and resource-adequacy modelling to assess reliability contributions across scenarios.
Illustration: Annual Solar Energy Versus Peak Capacity
A hypothetical 1 GW solar project at a 20% annual capacity utilisation factor generates 1,000 × 8,760 × 0.20 = 1,752,000 MWh, or 1.752 billion units annually. This does not mean it supplies 1 GW at 8 p.m. A hypothetical battery rated 1 GW/4 GWh can theoretically discharge at 1 GW for four hours before allowing for losses and reserves, but cannot sustain that output indefinitely. System planning must consider hourly and seasonal demand.
Why Solar Curtailment and Power Shortages Can Coexist
Transmission congestion can prevent solar electricity from leaving a generating area at midday even while demand exists elsewhere. In the evening, solar output may fall when demand remains high. These are different challenges: delivering available electricity and maintaining dependable supply. Transmission reinforcement, storage, flexible demand and firm generation address different aspects and should be evaluated together.
What the Latest Curtailment Figures Mean
Research published 12 October reported approximately 1.835 billion units of renewable electricity curtailed nationally during July–August 2026, including 1.462 billion solar and 373 million wind units. These are national figures and do not establish a Rajasthan-specific total. They also cannot, by themselves, determine the capacity required during peak shortages.
Can Battery Storage Replace Coal?
Batteries can shift daytime solar energy to evening peaks and provide fast grid services. Their contribution depends on power rating, energy duration, charging availability, efficiency and operating reserves. Pumped storage and flexible demand can provide additional reliability services. Long-duration or multi-day shortages may require different resource combinations. The relevant comparison is dependable capacity at acceptable total system cost, not a universal technology-versus-technology verdict.
Why Rajasthan Should Pay Attention
Rajasthan's solar and wind resources are valuable, but generation expansion must be matched with transmission, distribution, forecasting and local demand. Rajasthan's own peak and agricultural demand must be served reliably. Resource adequacy should therefore evaluate both renewable electricity production and dependable delivery during critical periods.
Rajasthan's Regulatory Framework
Rajasthan Electricity Regulatory Commission issued a Framework for Resource Adequacy Regulations, 2026, dated 24 April; Battery Energy Storage Systems Regulations, 2026, dated 13 May; and Demand Flexibility and Demand Side Management Regulations, 2026, dated 15 June. These instruments should be implemented together so that resource procurement, storage and demand flexibility reinforce each other rather than become isolated programmes.
Financial and Consumer Risks
Additional conventional plants can improve reliability but require capital, fuel and long-term contracts. Overbuilding may increase consumer costs if assets are underused. Underinvesting in dependable supply can also impose large shortage and emergency-procurement costs. Renewable curtailment can undermine project revenues and financing. Regulators need transparent scenario comparisons and allocation of risks across developers, utilities and consumers.
REAR's Eight Recommendations
First, CEA should publish formal updated adequacy assumptions and reconcile reported coal-capacity figures. Second, publish hourly and seasonal demand scenarios. Third, evaluate each resource's dependable contribution using consistent reliability metrics. Fourth, coordinate generation and transmission readiness. Fifth, implement Rajasthan's resource-adequacy, BESS and demand-flexibility rules together. Sixth, publish comparable whole-system cost scenarios. Seventh, distinguish network constraints, fuel outages and capacity shortages in public reporting. Eighth, protect consumers from avoidable long-term costs through evidence-based planning and competitive procurement where appropriate.
What the Industry Should Watch Next
Monitor formal CEA and Ministry of Power updates, revised demand forecasts, coal and hydro availability, BESS and pumped-storage commissioning, transmission expansion and implementation of Rajasthan's resource-adequacy regulations. The current public remarks should not be substituted for a formally published updated national plan.
Frequently Asked Questions
Has India approved 150 GW of additional coal capacity?
The reported remarks are preliminary; a final approved 150 GW requirement has not been established.
What did the March 2026 CEA plan project for coal?
Approximately 315 GW of installed coal capacity by 2035–36.
How much solar and battery storage does the plan project?
Approximately 509 GW solar and 80 GW/321 GWh battery storage by 2035–36.
Why can solar curtailment and shortages occur together?
Network constraints and timing differences can prevent electricity from reaching demand even when generation is available elsewhere.
Can batteries completely replace coal?
Not automatically. The answer depends on storage duration, charging opportunities, demand and reliability requirements.
What should Rajasthan prioritise?
Coordinated resource adequacy, transmission readiness, appropriately located storage, flexible demand and transparent reporting.
Conclusion: Better Reliability Planning, Not a Coal-versus-Solar Argument
India needs clean electricity and dependable supply during critical periods. Neither rapid solar expansion nor additional coal capacity should be treated as a complete solution in isolation. REAR recommends transparent, least-cost resource-adequacy planning that evaluates generation, storage, transmission and demand flexibility together. These are editorial recommendations, not a claim that REAR has filed a formal regulatory submission.
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