India PPA market shifts toward hybrid and BESS-backed projects amid grid risks

India's corporate renewable power market is increasingly shifting toward hybrid and storage-backed projects as transmission constraints, curtailment risks and varied state-level tariffs shape power purchase agreement pricing, market participants told Platts, part of S&P Global Energy, on Sept. 24.

Generators and independent power producers said buyers are increasingly favoring hybrid renewable projects over standalone solar and wind assets to better match their consumption profiles.

"Developers are evaluating battery energy storage systems to mitigate solar curtailment and improve supply reliability, although high capital costs remain a constraint," said a Tamil Nadu-based PPA broker.

Solar-plus-BESS projects are expected to fetch a premium of about 1.00-1.50 rupees/kilowatt-hour over standalone solar, depending on storage duration, battery capacity and discharge profile, according to independent power producers.

In September, market participants reported indicative 15-year ex-busbar prices for projects exceeding 100 megawatts in the 3.00-4.50 rupees/kWh range for solar, 4.50-5.50 rupees/kWh range for wind and solar-wind hybrids and 5.00-7.00 rupees/kWh range for solar-plus-BESS projects with an 80:20 solar-to-storage mix.

"Ex-busbar prices are generally stable, with generators and independent power producers typically only revising the tariff on a quarterly basis," the Tamil Nadu-based PPA broker said.

Grid risks, regulation

Transmission congestion, evacuation constraints and forced reductions in renewable generation remain key risks.

In some regions of the country, clean energy capacity has outpaced grid expansion, creating transmission bottlenecks that limit how much power the network can absorb. As a result, generators are sometimes required to curtail output, resulting in lost revenue.

"Grid infrastructure has not expanded quickly enough in some regions to match renewable generation growth, exposing developers to stranded capacity and lost revenue," a Gurugram-based independent power producer said.

Compounding these physical grid risks are evolving regulatory requirements, with independent power producers saying the government's updated Approved List of Models and Manufacturers List-II, which specifies domestic solar cell manufacturers and cell models, could increase solar PPA prices from around 3.50 rupees/kWh currently to higher levels over the near to medium term by narrowing procurement options and increasing the cost of compliant modules.

Solar PPA prices could rise to around 3.90 rupees/kWh in the near term, according to independent power producers.

A second Gurugram-based independent power producer said the gradual phaseout of Inter-State Transmission System waivers, introduced in 2016 to reduce the cost of interstate renewable power sales, and evolving state-level energy banking rules could add to commercial uncertainty around long-term investments in the near term.

PPA prices

Market participants said that while ex-busbar solar PPA prices were generally indicated at a baseline of 3.50-5.00 rupees/kWh nationwide, landed PPA tariffs varied across states after factoring in local transmission, grid and open-access charges.

"Ex-bus prices are broadly similar across India, but landed economics vary significantly by state," the second Gurugram-based IPP said.

A 15-year solar PPA was indicated at around 2.50-3.70 rupees/kWh ex-bus, with local transmission, grid and open-access charges adding 1.50-2.00 rupees/kWh, according to a Mumbai-based independent power producer and a Gujarat-based corporate buyer on Sept. 24.

Three- to five-year solar PPAs were indicated at around 4.00 rupees/kWh ex-bus, with transmission and grid charges adding about 2.00 rupees/kWh, according to a Tamil Nadu-based PPA broker on Sept. 11.

A Noida-based trader said Sept. 11 that landed renewable power costs could reach as high as 9.90 rupees/kWh after accounting for transmission and open-access charges, compared with conventional "brown power" electricity tariffs of about 2.20-3.50 rupees/kWh.

Limited vPPA activity

Virtual PPA activity remains limited due to uncertainty over pricing and contract structures.

With conventional power prices at around 2.20-3.50 rupees/kWh, a Tamil Nadu-based broker said vPPA strike prices would need to be lower than physical PPA tariffs to attract wider corporate participation.

"Data centers could support future growth," the Mumbai-based independent power producer said.

However, market participants said most data center buyers currently prefer to procure renewable power directly through bundled arrangements, such as green tariffs or PPAs paired with International Renewable Energy Certificates.

Upstream cost benchmarks

Underpinning these tariff dynamics are volatile upstream costs. Independent power producers said solar modules, land acquisition, local taxes, BESS components and wind turbines remain key sources of uncertainty in capital expenditure.

The Tamil Nadu-based power broker estimated that solar modules account for 60%-70% of total project costs, adding that significant volumes of modules are currently imported from China, leaving project economics exposed to global supply chain disruptions and foreign exchange fluctuations.