India has entered a paradoxical phase: it is adding renewable capacity at record speed, yet a rising share of clean electricity is becoming unusable because storage, transmission and dispatch flexibility have not grown at the same velocity. In Q1 2026 alone, India curtailed about 470 GWh of renewable generation; about 300 GWh was attributed to transmission constraints and about 170 GWh to system inflexibility. On March 30, 2026, alone, curtailment reportedly reached 34 GWh, roughly the daily electricity use of five million urban middle-class households.

The problem is not renewable energy. The problem is system design lag

India’s power architecture was built for centralised coal dispatch, not for solar noon surpluses, evening ramps, distributed generation, prosumers, EV charging, industrial electrification, green hydrogen and weather-linked variability. The Central Electricity Authority’s National Electricity Plan recognises this clearly: India needs 82.37 GWh of storage by 2026–27 and 411.4 GWh by 2031–32, split across pumped storage and battery energy storage.

1. The Core Diagnosis

India’s renewable capacity is now material, not marginal. By January 2026, total installed power capacity had crossed 520 GW, with non-fossil capacity exceeding fossil capacity in installed terms. Renewables supplied the bulk of new additions in 2025–26, but generation value is increasingly constrained by grid evacuation, flexible balancing and storage availability.

Three bottlenecks dominate:

First, transmission is slower than generation. Renewable plants can be built in 12–18 months; transmission corridors often need 3–5 years. This creates stranded capacity, especially in Rajasthan, Gujarat and Tamil Nadu. A recent Financial Times report estimated that more than 50 GW of clean capacity faces transmission-related constraints, while India has announced a large transmission expansion plan to integrate future renewables.

Second, coal plants remain operationally rigid. Many Indian coal plants operate around technical minimums of roughly 55%, which means they continue running even when cheaper solar and wind are available. Long-term PPAs can lock discoms into thermal offtake and produce avoidable curtailment of lower-cost renewable power.

Third, storage has not yet become a grid asset class at scale. India has policy signals—VGF for BESS, pumped storage guidelines, energy storage obligations, ISTS charge waivers—but deployment is still behind the scale implied by the renewable build-out.

2. Ramez Naam’s Relevance

Ramez Naam’s central insight is that solar, wind and batteries are not normal commodity technologies. They follow learning curves: costs fall as cumulative deployment rises. He has argued that new solar, wind and storage are on track to become cheaper than operating existing fossil assets in many markets, and that transmission is essential because clean energy must be moved across geography and time.

1. For India, Naam’s thesis should be translated as follows:
2. Clean energy is not expensive; unintegrated clean energy is expensive.
3. Solar is cheap, but curtailed solar is wasted capital.
4. Batteries are falling in cost, but batteries without markets are stranded assets.
5. Transmission is not a cost centre; it is the nervous system of energy abundance.

3. The Economic Logic

India must optimise for delivered firm power, not installed megawatts. The relevant metric is no longer ₹/kWh at the solar busbar. It is ₹/kWh of reliable, dispatchable, location-specific, time-matched electricity.

The hierarchy should be:

1. Avoid curtailment first through transmission, forecasting, market design and flexible dispatch.
2. Store surplus next through batteries, pumped hydro, thermal storage, hydrogen, EVs and industrial demand response.
3. Use coal intelligently as a strategic reliability and energy-independence bridge.
4. Retire inefficiency, not security.

4. Full-Spectrum Storage Strategy

India needs storage in every known form factor:

Lithium-ion BESS: for 1–4 hour balancing, frequency response, solar shifting and grid congestion relief.

Sodium-ion batteries: for lower-cost, mineral-secure stationary storage, especially where weight is less important.

Flow batteries: for 6–12 hour storage, industrial parks, renewable-rich states and critical infrastructure.

Pumped storage hydro: India’s largest long-duration storage pillar. The CEA/MNRE target implies PSP will supply a major share of required GWh by 2031–32.

Thermal storage: molten salts, sand, bricks, phase-change materials and industrial heat banks for steel, cement, textiles, food processing and district cooling.

Hydrogen and derivatives: not first for daily power storage, but essential for seasonal storage, fertiliser, refining, steel, shipping and exportable green molecules.

Compressed air and liquid air storage: suitable for mines, caverns, industrial clusters and long-duration grid balancing.

Gravity storage: deploy selectively in mines, ports, hilly terrain and industrial estates.

EV batteries as virtual storage: millions of two-wheelers, buses, cars and fleet depots should become a national distributed battery through time-of-day tariffs and vehicle-to-grid standards.

Demand response as “negative storage”: cold chains, irrigation pumps, desalination, data centres, green hydrogen electrolysers and industrial loads should absorb surplus renewable power when available.

5. Grid Upgrade Strategy

India needs a “Grid 2.0 Mission” with five layers:

Layer 1

National HVDC green corridors: connect Rajasthan, Gujarat, Ladakh, Tamil Nadu, Karnataka and offshore wind zones to demand centres.

Layer 2

State-level intra-transmission strengthening: curtailment is often local; state grids must be upgraded, not only ISTS corridors.

Layer 3

Dynamic line rating and AI dispatch: real-time weather, conductor temperature, load flows and congestion pricing can unlock latent grid capacity.

Layer 4

Time-of-day and locational pricing: electricity must become more valuable when scarce and cheaper when abundant.

Layer 5

Storage-as-transmission: batteries at substations should be treated as grid assets when they defer line upgrades and reduce curtailment.

6. The Case for Coal — Full Throttle, But Smarter

India cannot leap to energy independence by pretending coal is irrelevant. Peak demand has crossed 250 GW during heat stress periods in 2026, and demand will rise with cooling, EVs, manufacturing, data centres and urbanisation.

The Government of India has already proposed adding at least 80 GW of coal-based capacity by 2031–32, with estimated capital expenditure of about ₹6.67 lakh crore, because resource adequacy requires firm capacity.

The argument is not “coal versus renewables.” It is coal plus renewables plus storage plus grid until storage and firm clean power are sufficient.

India’s coal strategy should be:

1. Build only high-efficiency supercritical and ultra-supercritical plants.
2. Mandate flexible operation and lower technical minimums.
3. Use domestic coal to reduce imported fuel vulnerability.
4. Co-locate coal plants with solar, storage and future carbon capture.
5. Retire the dirtiest, least efficient units first.
6. Convert coal stations into grid-balancing and industrial heat hubs.
7. Avoid new long-term inflexible PPAs that block cheaper renewable dispatch.
8. Coal must become a strategic reserve and balancing platform, not a permanent excuse for inefficiency.

7. Financing Architecture

India should create a National Storage and Grid Bank with blended finance from sovereign funds, green bonds, infrastructure investment trusts, pension funds and multilateral climate capital.

Priority instruments:

1. Capacity payments for storage
2. Ancillary service markets
3. Curtailment-reduction contracts
4. Availability-based tariffs for batteries
5. Viability-gap funding for long-duration storage
6. Regulated asset treatment for grid-scale BESS
7. Carbon-credit monetisation for avoided curtailment
8. Domestic manufacturing incentives for sodium-ion, flow batteries and power electronics

8. Governance Recommendations

India should create a single dashboard showing:

• Renewable generation available
• Renewable generation curtailed
• Reason for curtailment: transmission, system inflexibility, market, backing down
• State-wise congestion
• Storage charged/discharged
• Coal flexibility performance
• Discom procurement behaviour
• Time-block prices

“What gets measured gets governed.”

9. The Strategic Conclusion

India’s next energy revolution will not be won by installing panels alone. It will be won by converting every electron into useful economic work.

The national mission should be:

No clean electron wasted. No factory starved. No household dark. No imported fuel dependency where domestic energy can serve.

Ramez Naam gives the optimism: technologies with learning curves will keep getting cheaper. India must add the realism: without transmission, storage, coal flexibility and market reform, cheap power can still become unusable power.

The winning strategy is, therefore, calibrated abundance:

Renewables at maximum speed. Storage in every form factor. Grid expansion as national infrastructure. Coal at full throttle for reliability and independence, but cleaner, flexible and progressively subordinated to cheaper firm clean power.

That is the architecture of Indian energy sovereignty.

By Shailesh Haribhakti [GCB.D] — Research Note, July 2026