Rajasthan 2.45 GW Solar-BESS Auction Closes with Coal India at Record $0.0359/kWh

The Rajasthan Solar Park Development Co. Ltd. has concluded an auction for 2,450 MW of solar capacity paired with 1,600 MW/6,400 MWh of battery energy storage systems (BESS), with Coal India securing the lowest tariff of USD 0.0359/kWh.

A Landmark Solar-Plus-Storage Auction

The tender, held for capacity at the Pugal Solar Park, marks a significant milestone in India's transition toward round-the-clock renewable energy, as it seeks to stabilize grid supply by mitigating the intermittency of solar power through large-scale storage integration.

The aggressive pricing that emerged from the auction indicates significant developer confidence in large-scale hybrid storage projects, despite concerns over battery and module cost volatility.

The results now place the spotlight on future project execution timelines and on whether developers can maintain margins at these competitive price points.

How the Auction Was Structured

The auction was divided into two distinct lots.

Lot 1, covering 2,000 MW, attracted intense competition, with 31 bidders competing against a starting tariff of USD 0.0423/kWh. NLC India and Rama Reflection India emerged as winners in this lot, securing 1,000 MW and 250 MW, respectively, at a tariff of USD 0.0371/kWh. Coal India took the remaining 750 MW in Lot 1 at USD 0.0372/kWh.

Lot 2, comprising 450 MW, drew 17 bids. Here Coal India won 225 MW at the lowest discovered tariff of the entire auction, USD 0.0359/kWh, while LEO Energies secured the balance of 225 MW at USD 0.0360/kWh.

In total, Coal India walked away with 975 MW across the two lots, the largest single allocation of any participant.

A Wide Spread in Bidder Assumptions

Perhaps the most striking feature of the auction was the disparity between the lowest tariff of USD 0.0359/kWh and the highest quoted tariff of USD 0.0699/kWh.

This wide range highlights a broad variance in internal assumptions among bidders regarding capital expenditure, battery degradation, and operational margins. For EPC contractors and developers, the results signal an intensely competitive landscape.

The fact that multiple large players were willing to bid well below the starting tariff of USD 0.0423/kWh suggests that established developers see viable economics in pairing multi-gigawatt solar capacity with substantial battery storage at the Pugal Solar Park.

Why the Result Matters

The auction's outcome carries implications beyond the individual winners. The pricing achieved demonstrates that solar-plus-storage configurations, once considered a premium product in India's procurement landscape, can now be discovered at tariffs within touching distance of plain-vanilla solar levels.

The 1,600 MW/6,400 MWh of BESS attached to the tender implies a four-hour storage duration across the paired capacity, a scale that would rank among the larger storage procurements tied to a single solar park tender.

The participation numbers reinforce the depth of interest in hybrid renewable procurement. A combined field of 31 bidders in Lot 1 and 17 bidders in Lot 2 underscores how central storage-linked solar tenders have become to developer pipelines in India.

What to Watch Next

Attention now turns to execution. Industry observers point to two key watch items arising from the auction: the ability of the winning developers to adhere to project execution timelines and their capacity to sustain margins while delivering at tariffs as low as USD 0.0359/kWh.

Both factors will be tested as the Pugal Solar Park projects move from auction results into procurement and construction phases. The volatility of battery and module costs remains a background concern cited in connection with the auction.

How the winning bidders, NLC India, Rama Reflection India, Coal India, and LEO Energies, manage equipment procurement against these price dynamics will shape whether tariffs at these levels prove durable in future tenders.