Tamil Nadu Power Generation Corporation to Launch 200 MW Battery Storage System at North Chennai Thermal Plant The Tamil Nadu Power Generation Corporation Limited (TNPGCL) will soon launch Battery Energy Storage Systems (BESS) with a capacity of 200 MW at the North Chennai Thermal Power Station on a pilot basis.

This marks the first time TNPGCL is exploring the use of battery storage systems in thermal power stations to allow electricity storage during low demand periods. Battery storage systems were previously considered options primarily for solar and wind energy applications. The new initiative represents a significant shift in approach for thermal power generation facilities.

Project Benefits and Limitations

When scaled up in due course, the battery storage system can ensure steady power supply, reduce the chances of power cuts, and avoid buying costly electricity from private companies, according to officials. A senior TNPGCL official stated that this will also save money for the power utility over time.

The system addresses operational challenges inherent in thermal power generation. Officials explained that restarting thermal units after shutting them down takes 10 to 12 hours. With BESS, the corporation can avoid shutting down units frequently, allowing plants to keep running at full load even when demand is low, thereby reducing operating costs.

However, there are certain limitations to the technology. BESS cannot be used to provide continuous base load power as it does not supply electricity at a consistent long-term output. An official noted that it cannot fully replace traditional power generation.

Financial Context and Impact

The initiative comes amid significant financial challenges for TNPGCL. According to official sources, TNPGCL incurred a loss of around ₹2,991 crore in 2024-25 after the division of power utility into three separate entities.

Another official warned that if proper steps are not taken, the losses may compound this year, and installing BESS in thermal stations will help control these losses. With the state's all-time maximum demand having touched 20,830 MW, there may not be immediate visible benefits through this pilot project due to the scale of current demand.

Implementation Process and Requirements

Once the state gives approval, the project will be taken up under the Viability Gap Funding (VGF) scheme. The implementation process requires multiple approvals and agreements. The Tamil Nadu Green Energy Corporation must also give its nod, and TNPGCL should sign a power purchase agreement with the power distribution company.

A senior TNPGCL official said the move follows directions from the Union Power Ministry, which has advised states to improve the efficiency of thermal stations by using battery storage.

Broader Infrastructure Context

TNPGCL operates three major thermal plants located in North Chennai, Mettur, and Thoothukudi, with a total capacity of 5,120 MW, making them ideal candidates for installing BESS. 

The North Chennai facility serves as the pilot location for this new battery storage initiative, potentially setting the stage for expansion to other thermal power facilities within the corporation's portfolio.

The pilot project represents a technological advancement in thermal power management, combining traditional thermal generation with modern energy storage capabilities to optimize operational efficiency and financial performance.