Executive summary

India’s 2047 ambition — the Viksit Bharat horizon — assumes a per-capita energy use roughly aligned with present-day middle-income economies. The arithmetic of getting there involves doubling installed capacity, modernising transmission, and decarbonising the existing fossil baseload. Solar and wind are doing extraordinary work, but they are intermittent by construction. The grid needs firm power — dispatchable, weather-independent, low-carbon — and the menu of available firm-power options is narrower than the renewable menu.

This piece argues that the National Energy Plan should treat fusion as a named, long-horizon line item — not as a near-term substitute for fission or hydro, but as a credible option for the back half of the planning horizon. The argument is not about ASPL. It is about whether India’s energy plan allocates research and ecosystem support in proportion to the importance of the firm-power gap.

1. The demand picture

India’s installed electrical capacity is roughly 460 GW today and rising. Peak demand has crossed 250 GW. The Government’s own draft National Electricity Policy for 2026 and successor planning documents project peak demand approaching 700 GW by 2047, with installed capacity needing to be roughly three times that to absorb intermittency and reserve margins. The IEA’s 2025 Electricity review tracks broadly similar trajectories.

The composition of the additions matters as much as the total. Roughly two thirds of the new capacity is planned to be renewable — solar in particular, with significant wind, modest hydro, and a small but growing battery-storage layer. That leaves a non-trivial firm-power requirement, and the firm-power menu has only a few entries.

2. What “firm power” actually means

Firm power is electricity that is available when called, at predictable cost, regardless of weather, time of day, or season. The traditional firm-power providers are coal, gas, large hydro, and nuclear. Solar and wind, even paired with batteries, do not currently meet the firm-power test at grid scale — the batteries discharge over hours, not days, and seasonal variation (monsoon clouds, winter wind lulls) overwhelms multi-day storage at affordable cost.

This is not a critique of renewables. It is a description of what they are good at and what they are not. Renewables are excellent at displacing fossil generation during their available windows; they need partnering with firm sources, or with storage at scales not yet commercially available, to anchor a fully decarbonised grid.

3. India’s firm-power options, honestly

Coal

Still the workhorse, still the largest source of baseload. Politically necessary for now; environmentally and atmospherically not the long-term answer. India’s announced intent is to grow coal generation only marginally and to retire older plants as renewables and storage absorb load.

Hydro

Limited by geography. The economically and environmentally feasible large-hydro sites have largely been developed. Pumped storage hydro is a real and growing contribution, but constrained by suitable terrain and water availability.

Natural gas

Cleaner than coal, useful for grid balancing, dependent on imports. Strategically uncomfortable as a base of long-term planning.

Fission

The Nuclear Energy Mission announced a target of approximately 100 GW of nuclear capacity by 2047 (up from approximately 7 GW today). The SHANTI Act 2025, passed on 17 December 2025 and in force from 21 December 2025, opens the nuclear sector to private participation for the first time in roughly six decades. India’s three-stage programme has a thorium destination that is the subject of a separate piece. Fission is doing real work in the firm-power plan.

Fusion

Long-horizon. Not in the firm-power numbers for 2047 as currently published, and reasonably so — the engineering and commercial timelines do not support it being a near-term firm-power contributor. The question for the policy planner is not whether fusion arrives in 2030 (it will not), but whether the back half of the planning horizon — 2040 onwards — should explicitly anticipate a fusion contribution and fund the research, ecosystem, and regulatory pathway accordingly.

4. The case for naming fusion in the plan

Policy plans serve two purposes. The first is forecasting. The second, often underweighted, is signalling: the plan tells the research community, the supply chain, and the regulator what the country is preparing for. A plan that names fusion as a long-horizon firm-power candidate — even if it allocates no near-term capacity — does three things:

  • Funds the right research through DST, BRNS, and the ecosystem of nuclear-physics programmes already documented in the Government’s Mega Science Vision 2035 — Nuclear Physics.
  • Sets regulatory expectations: AERB needs runway to develop frameworks for novel fusion-class facilities. A plan that anticipates the technology is one that funds the regulator to keep up with it.
  • Calibrates investor risk: long-horizon technologies need policy stability to attract patient capital. Naming fusion in the plan is the policy equivalent of a put option.

None of this requires forecasting fusion-class commercial deployment by a specific year. The naming is the point. The detailed timing follows the engineering.

5. What the plan would actually look like

A line item for fusion in the National Energy Plan does not have to be elaborate. A plausible minimum:

  • Recognition of fusion-class generation as a long-horizon firm-power candidate alongside fission and large hydro
  • Commitment to maintain a research-funding floor through DAE, DST, and BRNS aligned with MSV2035 §2.7.1 (volumetric neutron sources) and §4.1.3 (ADSS)
  • Tasking to AERB to develop a fusion-class facility licensing framework on a five-year horizon
  • Continued participation in international fusion programmes (ITER, DEMO-class collaborations) with explicit knowledge-transfer expectations
  • Permission for private participation under the SHANTI Act 2025 framework, with attendant safety and reporting obligations

These are policy moves, not engineering moves. They cost the exchequer essentially nothing in the near term and considerably reduce friction across the long term. They also signal seriousness — that India intends to be a contributor to the long-horizon firm-power answer, not merely a buyer.

6. What this argument is not

This piece is not a forecast that fusion will be on the grid by a particular year, nor a claim that ASPL specifically is the entity that will put it there. The first claim is not knowable from where we sit today. The second claim would be improper. Fusion-class energy is an open research direction with multiple international and Indian programmes contributing.

What we are saying is narrower: in a country whose firm-power gap is structural and whose ambition reaches to mid-century, the long-horizon options deserve to be visible in the planning document. Not because they will solve the next decade’s problem — they will not — but because the country’s ability to shape the back half of the century depends on choices made now about which research directions and which ecosystems receive sustained, predictable support.

Sources & further reading

Companion pieces: The thorium dimension of India’s firm-power story is in The Thorium Question, Reframed. The institutional framing of India’s fusion sector is in India Fusion Day.