Relevance Type: Energy Policy and Renewable Transition Challenge
What Happened
Central Electricity Authority (CEA) Chairperson Ghanshyam Prasad has warned that inflexibility in India's electricity grid is creating "dangerous" situations, as rapid renewable energy capacity additions are outpacing the grid's ability to absorb and balance variable power flows. Speaking at a recent industry conference, Prasad highlighted that solar and wind power is being deliberately curtailed — wasted despite being generated — because the grid cannot accommodate it during periods of high generation and low demand.
The core problem: India's thermal (coal) power plants, which provide the bulk of base-load electricity, cannot quickly ramp up or ramp down output. Most coal plants have a minimum technical load of around 55 percent of their rated capacity — meaning they cannot reduce output below this threshold. During sunny afternoons when solar generation peaks, grid operators face a situation where both solar and coal are generating more power than is needed, with neither able to easily step back. The result is forced curtailment of renewable energy — and grid oscillations that can damage equipment and destabilise supply.
India curtailed approximately 2.3 terawatt-hours (TWh) of solar power between May and December 2025, representing lost clean energy and financial losses for renewable developers. Around 50 gigawatts (GW) of renewable capacity across India remains unable to be reliably evacuated into the grid due to transmission bottlenecks and grid balancing limitations. Prasad noted that record renewable capacity additions — India has been adding 20+ GW of renewable capacity annually — have accelerated the problem.
Static Topic Bridges
1. India's Electricity Grid: Architecture and the Challenge of Variable Renewables
India's electricity grid is a complex interconnected network managed at two levels: - Central grid (ISTS — Inter-State Transmission System): Managed by Power Grid Corporation of India (PGCIL), transmits high-voltage power across states - State grids (Intra-State Transmission System): Managed by State Transmission Utilities (STUs) and Distribution Companies (DISCOMs)
The Central Electricity Authority (CEA) is the apex technical advisory body under the Ministry of Power, responsible for national electricity planning, standards, and grid codes.
Traditional electricity grids were designed around "dispatchable" power sources — primarily coal, gas, and large hydro — where generation can be scheduled and controlled to match demand. Renewable energy — solar and wind — is "variable" or "intermittent": generation depends on weather, not command. Solar output peaks around noon and is zero at night; wind output can spike or drop within minutes.
Integrating large quantities of variable renewables requires: 1. Grid infrastructure that can rapidly shift power flows across regions 2. Flexible "back-up" sources (hydro, gas, batteries, pumped storage) that can compensate for renewable variability 3. Demand-side flexibility (shifting electricity use to match supply) 4. Advanced grid management technologies (smart grids, real-time balancing)
2. Renewable Energy Curtailment: Causes, Costs, and Policy Implications
Curtailment occurs when a power plant generates electricity but grid operators instruct it to reduce or stop output. Renewable curtailment happens specifically because the grid cannot absorb the available clean power. Key reasons in India:
- Thermal inflexibility: Coal plants cannot ramp down below 55% minimum load, creating a "floor" of thermal generation even when solar is at peak
- Transmission bottlenecks: Major renewable generation clusters (Rajasthan, Gujarat, Tamil Nadu, Karnataka) are geographically distant from demand centres, and transmission lines are congested
- DISCOM financial stress: State distribution companies, many loss-making, sometimes "back-down" renewable power to avoid paying for electricity they cannot sell profitably
- Grid oscillations: High variable renewable penetration without adequate flexibility causes frequency and voltage fluctuations that can trigger protective shutdowns
The cost of curtailment falls primarily on renewable developers who lose revenue, threatening project viability and investor confidence. India needs approximately $500 billion in renewable investment by 2030 to meet its 500 GW renewable target — curtailment risk directly undermines this investment case.
3. Solutions for Grid Flexibility: Storage, Pumped Hydro, and Demand Response
CEA Chairperson Prasad emphasised several solutions being pursued:
Pumped Hydro Storage (PHS): India's preferred large-scale storage solution. PHS works like a giant rechargeable battery — water is pumped uphill to a reservoir using surplus electricity (e.g., excess solar), then released through turbines when power is needed. India plans to develop approximately 100 GW of pumped hydro capacity over the next decade. PHS offers long-duration storage (several hours to days), system stability, and grid inertia — which synthetic inverter-based storage cannot replicate.
Battery Energy Storage Systems (BESS): Lithium-ion and other battery technologies offer fast-response balancing (seconds to minutes) and are increasingly cost-competitive. BESS capacity is growing rapidly in India, with several large-scale projects under the Viability Gap Funding (VGF) scheme. They complement pumped hydro for short-duration, fast-response needs.
Demand Flexibility / Demand Side Management (DSM): Shifting industrial and commercial electricity consumption to periods of high renewable generation. Rajasthan's new DSM Regulations 2026 mandate that DISCOMs develop Demand Flexibility Portfolio Obligations — starting at 0.25% in FY27 and rising to 2% by FY30.
Thermal Plant Flexibility: The CEA and Ministry of Power are developing incentive frameworks for coal plants to operate more flexibly — reducing their minimum technical load from 55% toward 40%, and improving ramp rates. This is technically challenging but essential for integrating high renewable shares.
Smart Transmission: Inter-state transmission expansion, High Voltage Direct Current (HVDC) links between renewable-rich and demand-heavy regions, and advanced grid management software.
4. India's Renewable Energy Targets: 500 GW by 2030 and Energy Transition
India has committed under its Nationally Determined Contribution (NDC) to achieve 500 GW of non-fossil fuel electricity capacity by 2030, with renewables (solar + wind) making up the bulk. Progress as of early 2026: - Installed renewable capacity: ~220 GW (solar ~100 GW, wind ~47 GW, large hydro ~47 GW, others) - Annual addition rate: 20+ GW of solar and wind - Target gap: Approximately 280 GW remaining in 5 years — requiring dramatic acceleration
The grid inflexibility problem is therefore not a marginal concern but a central constraint on India's energy transition. At 220 GW of renewables, curtailment is already significant; at 500 GW, without massive grid upgrades, curtailment would be catastrophic.
The CEA's warning signals that infrastructure planning — transmission, storage, and grid modernisation — must run parallel to capacity addition. Renewable energy certificates (RECs), green energy open access, and ancillary services markets are policy tools being refined to provide the right incentives for grid-supporting behaviour.
Key Facts & Data
- CEA Chairperson: Ghanshyam Prasad
- Solar curtailment May–December 2025: ~2.3 TWh
- Stranded renewable capacity: ~50 GW (unable to evacuate due to transmission and grid limits)
- Coal plant minimum technical load: ~55% of rated capacity (inflexibility threshold)
- India's 2030 renewable target: 500 GW non-fossil fuel capacity
- Current installed renewable capacity: ~220 GW (solar ~100 GW, wind ~47 GW, others)
- Pumped hydro target: ~100 GW over next decade (CEA plan)
- PGCIL role: Manages Inter-State Transmission System (ISTS)
- Rajasthan DSM Regulations 2026: Demand Flexibility Portfolio Obligation — 0.25% in FY27, rising to 2% by FY30
- NDC commitment: 500 GW non-fossil capacity by 2030; 50% electricity from non-fossil sources
- Investment needed: ~$500 billion in renewables by 2030
- DISCOM issue: Many loss-making state distributors "back down" renewable power to avoid costs