Tamil Nadu Greenlights Solar-Battery Hybrid Projects to Address Evening Power Crunch
In a significant move to bolster renewable energy supply during critical evening peak hours, the Tamil Nadu Electricity Regulatory Commission (TNERC) has granted approval for two innovative solar-plus-battery storage projects within the state. The regulatory body has adopted a competitive tariff of ₹4.47 per unit, which was discovered through transparent bidding processes conducted on the state's official e-procurement portal.
Project Details and Strategic Locations
The approved projects will be developed under the build-own-operate model by two key state entities: the Tamil Nadu Green Energy Corporation Limited (TNGECL) and the Tamil Nadu Power Distribution Corporation Limited (TNPDCL). These installations are strategically planned for the districts of Karur and Thiruvarur, marking a targeted approach to regional energy infrastructure enhancement.
Each project represents a sophisticated hybrid energy solution, combining a 15-megawatt solar photovoltaic plant with an integrated 15MW/45MWh battery energy storage system (BESS). This configuration is specifically engineered to capture solar energy generated during daylight hours and store it for deployment during the evening peak demand period, effectively providing 15MW of reliable power for three consecutive hours when grid stress is typically highest.
Competitive Bidding and Project Awardees
The tariff structure was established through competitive tendering, with distinct winners emerging for each location. Evolve Green Energies Private Limited secured the Karur project as the lowest bidder, while BVG India Limited was awarded the Thiruvarur installation. This competitive process ensures cost-effectiveness and market-driven pricing for the state's energy consumers.
Long-Term Tariff Framework and Consumer Safeguards
TNERC has established a comprehensive regulatory framework for these projects, with the approved tariff of ₹4.47 per unit remaining valid for an extensive 25-year period. Importantly, payments will be made exclusively for the energy actually delivered to the grid, creating a performance-based incentive structure for project operators.
The commission has implemented multiple protective measures to safeguard consumer interests and prevent potential misuse of the composite tariff arrangement. A key provision mandates that if the battery storage system becomes unavailable or non-functional, the distribution utility will only be required to pay the lower of either the Central or state agency benchmark solar tariff, rather than the higher composite rate. This mechanism ensures fair pricing during operational disruptions.
Strategic Benefits and Grid Advantages
According to TNPDCL officials, these projects deliver multiple strategic advantages for Tamil Nadu's power infrastructure. The integrated solar-battery systems will significantly enhance the state's ability to manage evening peak demand, improve overall grid stability, and reduce dependence on expensive short-term power purchases from external sources. Furthermore, these initiatives directly support Tamil Nadu's ambitious renewable energy targets while promoting sustainable energy development.
The combination of solar generation with advanced battery storage technology represents a forward-looking approach to energy management, addressing the inherent intermittency challenges of renewable sources while maximizing their contribution to the state's power portfolio during periods of highest consumption and need.
