India’s Renewable Energy Breakthrough: Firm Power Challenges Coal on Price and Reliability – Indian PSU

India’s renewable-energy story may be entering a decisive new phase.

For decades, coal has been the backbone of India’s electricity system because it can provide large-scale, dependable power around the clock. Solar and wind, despite their rapidly falling costs, have traditionally been viewed as intermittent sources that require conventional generation or storage to provide reliability.

A landmark 1,000 MW round-the-clock renewable-energy auction conducted by the Solar Energy Corporation of India (SECI) could challenge that assumption.

The auction discovered tariffs of just ₹5.25–₹5.26 per kWh, with the winning tariffs fixed in nominal terms for 25 years. Seven developers emerged successful, and remarkably, all winning bids fell within a narrow one-paisa range.

That consistency is significant. It suggests that the ₹5.25/kWh level may not simply be the result of one unusually aggressive bid but could be emerging as a genuine market benchmark for firm renewable power.

A new study by the India Energy & Climate Center (IECC) at the University of California, Berkeley, titled “India’s Renewable Energy Breakthrough: Coal-Like Reliability at a Lower, Fixed Price,” examines why such pricing is now possible.

Renewable Energy Moves Beyond Intermittency

The SECI auction was structured differently from conventional solar procurement.

Instead of simply purchasing daytime solar generation, the procurement profile requires developers to supply electricity when consumers need it most—including during the evening, night and morning.

Generators must supply at least 90% of their contracted capacity during six peak hours selected by the buyer, at least 70% during other non-solar hours and between 50% and 60% during solar hours.

Performance is measured in every 15-minute block, with shortfalls attracting a penalty of 1.5 times the contract price.

In other words, developers are not merely selling solar electricity. They are being asked to deliver a dependable power product.

That distinction could be transformative for India’s electricity market.

Solar Plus Batteries Can Mimic a Firm Power Plant

The IECC study tested whether solar generation combined with battery storage could economically meet this demanding supply profile.

Using ten years of hourly weather data from ten Indian states, the researchers found that a least-cost configuration for every 1,000 MW of contracted firm renewable power would require approximately 3 GW of solar capacity and 12 GWh of battery storage at high-quality solar locations such as Rajasthan.

In states with less favourable solar conditions or more challenging monsoon patterns, the solar requirement could rise by approximately 15–20%, while battery storage requirements would remain around 12 GWh.

The economics are being enabled by the dramatic decline in the cost of both solar modules and battery storage.

But India has another advantage.

India’s Geography Gives Solar an Edge

According to IECC, India’s location relatively close to the equator means its solar resource is considerably more stable across the year than that of higher-latitude countries.

That matters enormously when batteries are being used to shift solar electricity from daytime to evening and nighttime.

“India’s main challenge is shifting abundant daytime solar into the evening and night,” the study argues, a challenge that is particularly well suited to increasingly mature and lower-cost battery technologies.

This is fundamentally different from trying to compensate for severe seasonal variations in renewable generation.

₹5.25/kWh Could Become a New Benchmark

The most striking feature of the SECI auction was not merely the headline tariff but the consistency among bidders.

Sixteen companies participated in the auction, while seven developers ultimately secured capacity. Every successful tariff was between ₹5.25 and ₹5.26 per unit.

That one-paisa spread is difficult to ignore.

IECC researchers say the outcome provides confidence that ₹5.25/kWh is becoming a market benchmark for firm renewable electricity rather than representing an isolated aggressive bid.

There is another important advantage: price certainty.

A renewable project does not face the same exposure to coal, gas or other fuel-price fluctuations that conventional thermal generation does. With the tariff fixed for 25 years, buyers gain long-term visibility over electricity costs.

And when inflation is taken into account, the real value of the fixed tariff will decline over the life of the contract.

The Challenge to New Coal Power

This is where the SECI auction becomes strategically important.

India will continue to require thermal power for years, particularly because of rapidly rising electricity demand and the need for system balancing. Coal is not going to disappear from the power mix overnight.

But the economic case for new coal capacity could increasingly come under pressure if renewable energy combined with storage can provide firm electricity at competitive tariffs.

The question is no longer simply whether solar can produce electricity more cheaply than coal during sunny hours.

The more important question is:

Can renewable energy plus storage provide dependable electricity when the sun is not shining—and at a competitive long-term price?

The SECI auction suggests that the answer is increasingly yes.

Major Opportunity for Industry

The implications extend well beyond electricity distribution companies.

Energy-intensive industries such as steel, aluminium, manufacturing and data centres require reliable electricity. Historically, their options for dependable power have been dominated by conventional generation and grid supply backed by thermal capacity.

Firm renewable power at around ₹5.25/kWh changes that equation.

For industries under increasing pressure to reduce their carbon footprint, the combination of clean electricity, reliability and 25-year price visibility could become highly attractive.

Data centres, in particular, represent a rapidly expanding source of electricity demand and require power around the clock. A scalable firm-renewable model could therefore become an important component of India’s strategy for meeting this new demand.

A Competitive Advantage for Indian Manufacturing

The broader economic implications may be even more significant.

If India can scale firm renewable procurement at competitive prices, manufacturers could gain access to large volumes of clean electricity without accepting the traditional trade-off between sustainability and reliability.

That could strengthen India’s position as global supply chains increasingly factor carbon intensity into investment decisions.

The IECC study argues that a combination of reliability, low cost and long-term price certainty could become a competitive advantage for Indian industry.

For other emerging economies, India’s experience could also offer an alternative to investing heavily in new coal- and gas-fired power plants.

Coal Will Remain—But the Rules Are Changing

The development should not be interpreted as the immediate end of coal in India.

Coal-fired power remains critical to India’s electricity system, and thermal generation will continue to play an important role in ensuring grid stability and meeting demand.

But the strategic equation is changing.

Until recently, the conventional argument was straightforward: renewable energy may be cheaper, but coal is dependable.

The SECI auction introduces a new proposition:

Renewable energy, when combined with sufficient storage and designed around actual demand, can deliver firm power with a reliability profile comparable to conventional generation—while offering long-term tariff certainty.

At ₹5.25/kWh, that proposition is no longer merely theoretical.

It is being tested in the market.

And if India can replicate the SECI model at much larger scale, the country’s power-sector transition may no longer be simply about replacing coal with renewables.

It could be about changing what India considers to be the most economical source of dependable electricity in the first place.

The writer of this article is Dr. Seema Javed, an environmentalist & a communications professional in the field of climate and energy