ACME Solar scales Rajasthan BESS past 2 GWh in 2026

What ACME Solar announced

ACME Solar Holdings Ltd said it has operationalised more than 2 GWh of battery energy storage system (BESS) capacity in Rajasthan. The company added that this takes its cumulative operational storage capacity in the state to 591.18 MW/2,031.24 MWh across subsidiaries. The update was issued through an official company communication on Wednesday.

The milestone matters because utility-scale storage is increasingly being positioned as a grid balancing tool in high-renewable states like Rajasthan. ACME Solar’s announcement also comes alongside a sharper timeline for future additions. The company said it plans to expand its storage portfolio to 10 GWh by 2027, as it scales investments in energy storage alongside renewable generation.

Why battery storage is central to grid balancing

ACME Solar said the newly operationalised systems are designed to store electricity during periods of low demand and supply it during peak hours. This “charge off-peak, discharge during peak” function is intended to help balance supply and demand. The company linked this directly to the needs of a power system with rising renewable energy penetration.

Battery storage is being used to manage the intermittency associated with solar and wind generation. When output fluctuates, storage can help smooth delivery and improve the utilisation of generation assets. ACME Solar framed the Rajasthan additions as part of this broader grid stability objective.

Key operational capacity now in Rajasthan

The company’s stated cumulative operational storage in Rajasthan stands at 591.18 MW/2,031.24 MWh across subsidiaries. ACME Solar also described continuous commissioning of phases in recent months. It cited commissioning in March 2026 of phases totalling 142.67 MW/481.49 MWh, and earlier that month another phase of 33.335 MW/160.51 MWh in Rajasthan.

In separate project-level disclosures, ACME Solar provided commissioning progress through specific subsidiaries. These updates outlined phased capacity additions, project-wise planned capacities, and commercial operation timelines.

Project milestones disclosed in regulatory filings

In a regulatory filing to BSE Limited and the National Stock Exchange of India, ACME Solar described commissioning progress through its subsidiaries in Rajasthan. ACME Surya Power Private Limited commissioned the first phase of its BESS project in Jaimalsar village, Bikaner, adding 60 MW/269.606 MWh. The total planned capacity for that project is 250 MW/1,103.392 MWh, with the Commercial Operation Date (COD) scheduled for March 25, 2026.

Separately, ACME Suryodaya Private Limited commissioned the fourth phase of its BESS project across Sanwara and Mehar Nagar in Jaisalmer district, adding 95 MW/200.64 MWh. With this, the project’s total commissioned capacity reached 171 MW/361.14 MWh, against a planned capacity of 285 MW/601.904 MWh. The COD for this phase was also set for March 25, 2026.

ACME Solar also disclosed commissioning of a second phase under ACME Surya Power, adding 35.714 MW/160.48 MWh. After this phase, the commissioned capacity for that project was stated at 95.714 MW/430.086 MWh, with the COD for the newly commissioned phase set for March 26, 2026.

Merchant operations and ISTS connectivity

In another update on Rajasthan storage projects, ACME Solar said the newly commissioned BESS systems are integrated with the existing inter-state transmission system (ISTS). The company said these projects will operate on a merchant basis, with an intent to generate an additional revenue stream by capitalising on price differences between peak and non-peak demand hours.

In that disclosure, ACME Solar said it had commissioned an additional 155 MW/470.25 MWh in Rajasthan, taking total commissioned BESS capacity to 297.67 MW/951.74 MWh, out of a planned total of 835 MW/3,114.64 MWh through special-purpose vehicles.

How storage links to ACME Solar’s broader pipeline

ACME Solar said it has a total portfolio of 8,071 MW across solar, wind, hybrid and storage segments. Of this, 2,990 MW is operational, while 5,081 MW is under construction, including around 15 GWh of battery storage capacity. The company also said its under-construction portfolio includes 3,280 MW tied up under power purchase agreements.

The company has also said it undertakes engineering, procurement, construction, and operations and maintenance in-house. Separately, ACME Solar has indicated that its broader project pipeline requires installing around 17 GWh of BESS capacity in phases across different states.

Deals, funding, and long-duration commitments

ACME Solar’s disclosures also reference longer-tenor contracting structures for storage-linked renewables. In November 2025, a subsidiary, ACME Platinum Urja, signed a 25-year power purchase agreement with the Solar Energy Corporation of India (SECI) for a 200 MW solar project that includes an integrated 100 MW energy storage system. The tariff cited for this agreement was Rs 3.42 per unit, subject to required approvals from central and state regulators.

The company has also cited securing funding of Rs 4,725 crore to support renewable energy projects, as part of its broader build-out.

Snapshot table: capacities, projects, and timelines

Market impact and what investors track next

ACME Solar’s update adds clarity on how quickly large storage capacity is being brought online in Rajasthan and how it is intended to be used. The company has positioned merchant operation on ISTS-connected systems as a way to participate in short-term price spreads between peak and off-peak hours. It has also outlined a pipeline where storage is expected to play a structural role alongside renewable generation.

Investors and sector watchers are likely to focus on execution against the stated 10 GWh by 2027 target, phase-wise commissioning against planned capacities, and the mix between merchant operations and longer-tenor contracted arrangements under PPAs. The company has indicated that BESS assets can later be integrated with firm and dispatchable renewable energy (FDRE) projects under 25-year PPAs.

Conclusion

ACME Solar has reported crossing the 2 GWh operational BESS threshold in Rajasthan, with cumulative operational storage of 591.18 MW/2,031.24 MWh across subsidiaries. Alongside multiple phase-wise commissioning updates and COD timelines in March 2026, the company has reiterated its aim to scale storage to 10 GWh by 2027. Future updates are expected to centre on commissioning of remaining phases in Rajasthan, progress in under-construction capacity, and further integration of storage with contracted renewable projects.