ACME Solar Holdings on Tuesday said it has secured a 220 MW solar project integrated with a Battery Energy Storage System (BESS) from Rewa Ultra Mega Solar Ltd for the Morena Solar Park in Madhya Pradesh. The award is part of a larger 440 MW tender floated under tariff-based competitive bidding guidelines, where an e-reverse auction was conducted in September 2025.

The tender structure itself reveals the direction in which Indian renewable energy procurement is moving. This is no longer a plain vanilla solar generation contract. The project mandates a maximum annual capacity utilisation factor of 35 percent and, more critically, requires assured supply during two peak windows of the day, two hours each in the morning and evening, with 95 percent annual availability.

This obligation fundamentally changes the nature of a solar project. It introduces storage not as an optional add-on, but as a central operational requirement to meet peak-hour dispatch commitments under the Power Purchase Agreement that will run for 25 years.

Charging energy for the evening peak will be sourced from the solar plant’s own generation. For the morning peak, the procurer will supply charging energy during night hours free of cost. This structure reduces one of the key cost challenges in hybrid renewable projects, which is the economics of charging batteries from the grid at commercial tariffs.

RUMSL will provide land and evacuation infrastructure above the 33 kV level as part of the solar park facilities. This reduces execution risks for the developer and improves project viability by eliminating two major bottlenecks that often delay renewable projects: land aggregation and grid connectivity.

The Power Purchase Agreement will be signed with Madhya Pradesh Power Management Company Ltd and RUMSL.

This project is an example of how state procurers are redesigning renewable tenders to solve a long-standing problem in India’s energy transition: solar power is abundant in the afternoon, but demand peaks in the morning and evening.

Traditional solar PPAs did not address this mismatch. Discoms were forced to either curtail solar during oversupply hours or rely on thermal and hydro to meet peak demand. By mandating peak supply windows with storage, this tender structure converts intermittent solar power into a more dispatchable and grid-friendly resource.

For developers, this means moving up the value chain from energy generation to energy management.

For discoms, it means procuring renewable energy that can realistically replace a part of thermal peak supply rather than merely adding to daytime surplus.

The use of tariff-based competitive bidding with an e-reverse auction shows that storage-backed renewables are now entering the mainstream procurement framework rather than being treated as pilot projects.

The fact that RUMSL is offering land and evacuation infrastructure further indicates that government-backed solar park models are being aligned with next-generation renewable requirements that include storage and firm supply obligations.

This also aligns with India’s broader push toward integrating battery storage into renewable capacity additions to improve grid stability as renewable penetration rises.