Ahasolar Technologies Limited has been awarded a consultancy work order by Coal India Limited (CIL) for a 187.5 MW / 750 MWh Battery Energy Storage System (BESS) project. The contract is valued at ₹97.55 lakh and pertains to a project site located in Choutuppal, Telangana. The development follows Coal India’s acquisition of project rights from the Telangana Power Generation Corporation (TGGENCO).
Consultancy Mandate and Scope of Work
Under the terms of the agreement, Ahasolar Technologies will serve as the “Owner’s Engineer-cum-Engineering Consultancy Firm.” The mandate includes the provision of pre-award and post-award engineering services for the Engineering, Procurement, and Construction (EPC) phase of the project.
The consultancy contract has an execution timeline of 15 months. This is a domestic agreement, and official disclosures indicate that the promoters or group companies of Ahasolar Technologies hold no related party interests in Coal India Limited.
Project Technical Specifications and Location
The BESS facility is designed with a power capacity of 187.5 MW and a storage capacity of 750 MWh. It will be situated at the 400/220 kV Substation in Choutuppal, Telangana, to support grid stability by storing energy during periods of low demand and discharging during peak periods.
Technical requirements for the project include:
- Indigenous Development: The application software for the Energy Management System (EMS) must be developed indigenously within India.
- Operational Parameters: The system must maintain a C-rate of 0.25 and be capable of charging or discharging in specific blocks of 60 MW/240 MWh or 67.5 MW/270 MWh.
- Performance Guarantees: The developer must guarantee a minimum annual average system availability of 95% and ensure at least one complete four-hour charge-discharge cycle per day.
- Component Standards: The use of refurbished battery cells is prohibited.
Background Context and Tender History
Coal India Limited secured the rights for this project from TGGENCO through a competitive bidding process under a Build, Own, Operate (BOO) model with a 15-year tenure. The original consultancy tender (Ref: GEM/2026/B/7559479) was issued on May 19, 2026.
The project was awarded at a tariff of ₹3.14 lakh/MW/month. The facility is eligible for Viability Gap Funding (VGF) of ₹18 lakh/MWh, which is scheduled for release in three distinct phases upon the achievement of project milestones. While the consultancy mandate is set for 15 months, the overall BESS project completion is required within 18 months of the signing of the Battery Energy Storage Purchase Agreement (BESPA).
Key Project Particulars
| Particulars | Response |
| Entity Awarding Contract | Coal India Limited |
| Consultancy Firm | Ahasolar Technologies Limited |
| Contract Role | Owner’s Engineer-cum-Engineering Consultancy Firm |
| Capacity / Configuration | 187.5 MW / 750 MWh |
| Site Location | Choutuppal Substation, Telangana |
| Contract Value | ₹97.55 lakh |
| Execution Timeline | 15 months |
Official & Regulatory Sources
- Coal India Limited (CIL) – Official Tenders Portal
https://www.coalindia.in/tenders/tenderupload/ - Ahasolar Technologies Limited – Official Company Website
http://www.ahasolar.in/ - BSE India – Ahasolar Technologies Ltd (SME: 543941) Stock Page & Disclosures
https://www.bseindia.com/stock-share-price/ahasolar-technologies-ltd/AHASOLAR/543941/ - Official Tender Documentation (GeM Portal Reference: GEM/2026/B/7559479)
Available via the CIL Tender Archive for the 187.5 MW/750 MWh BESS Project.
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