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Tamil Nadu Unveils Rs 1 Lakh Rooftop Solar Subsidy and New BESS Policy in 2026-27 Revised Budget

The Tamil Nadu Government has announced a new rooftop solar subsidy of up to Rs 1 lakh for domestic consumers as part of its Revised Budget Estimates for 2026-27, strengthening the state's push towards distributed renewable energy and lower household electricity costs. The proposed scheme will be implemented in convergence with the Pradhan Mantri Surya Ghar: Muft Bijli Yojana, with the state government allocating Rs 50 crore for its implementation.

The announcement was made by Finance Minister Dr. N. Marie Wilson while presenting the Revised Budget for 2026-27. The proposed state-level support is intended to encourage more households to install rooftop solar systems and reduce their dependence on grid electricity. By combining the state subsidy with the central rooftop solar programme, Tamil Nadu aims to make residential solar installations more financially accessible while increasing the contribution of distributed generation to the state's electricity mix.

The rooftop solar initiative comes at a time when Tamil Nadu is experiencing sustained growth in electricity demand. The state has one of India's largest industrial and manufacturing bases, alongside substantial residential and commercial consumption. Rising air-conditioning use, industrial expansion, urbanisation and the electrification of transport are expected to put further pressure on the power system. Expanding rooftop generation can help consumers produce electricity closer to the point of consumption and potentially reduce daytime demand on the distribution network.

Tamil Nadu is also preparing for a substantial increase in electricity demand over the longer term. The government expects peak power demand to exceed 37,000 MW by 2035-36. Meeting this requirement will require simultaneous investment in generation, transmission, distribution and energy storage. The revised budget therefore includes a wide range of infrastructure measures intended to strengthen the state's power system and prepare it for higher renewable-energy penetration.

On the generation side, the government plans to expedite the Udangudi Stage-I and Ennore SEZ Thermal Power Projects, which together are expected to add 2,640 MW of generation capacity. The state will also accelerate implementation of the ETPS Expansion Project, estimated at Rs 8,000 crore, through a public-private partnership model. In addition, Rs 5,050 crore has been earmarked for the Vellimalai Pumped Storage Hydroelectric Project, reflecting the growing importance of dispatchable and flexible resources as renewable generation expands.

Energy storage has been given particular attention through the proposed Battery Energy Storage System (BESS) Promotion Policy. The government intends to use the policy to attract private investment and establish Tamil Nadu as a major hub for battery energy storage. Large-scale batteries can help store electricity during periods of high renewable generation and release it when demand increases, making them increasingly important for balancing solar and wind generation and managing evening peak demand.

Transmission infrastructure will also receive significant investment as the state prepares to integrate additional renewable capacity. The government has proposed the Rs 4,000 crore Coimbatore-Ariyalur 765 kV transmission project under the PPP model, along with Rs 1,390 crore of investments to strengthen ultra-high-voltage transmission infrastructure in Chennai and surrounding areas. These projects are intended to increase the ability of the transmission system to transport electricity between major generation and consumption centres.

Tamil Nadu will also accelerate the Phase-II Green Energy Corridor project, estimated at Rs 1,187 crore, and the Rs 1,640 crore Virudhunagar-Coimbatore 765 kV transmission project. The state plans to seek financial assistance for Phase III of its Green Energy Corridor programme, estimated at Rs 6,884 crore, which is designed to facilitate the evacuation of approximately 11,760 MW of renewable energy. Strengthening evacuation infrastructure will be essential as Tamil Nadu continues to add large quantities of wind and solar capacity.

Distribution infrastructure is another major focus of the revised budget. The government plans to establish 178 new substations at an estimated cost of Rs 1,543 crore and progressively replace around 40,000 ageing transformers with an investment of Rs 2,000 crore. These measures are aimed at improving network capacity and reliability while preparing the distribution system for increasing electricity demand, rooftop solar connections, electric vehicles and other new loads.

The state is also planning a significant expansion of smart metering. Smart meters will be introduced for all consumers in Chennai and for around 50 lakh industrial and commercial consumers across other parts of Tamil Nadu. Wider smart-meter deployment could improve consumption monitoring, billing accuracy and demand management while creating the digital infrastructure needed for more advanced electricity tariffs and grid-management systems.

Electric mobility has also been incorporated into the state's infrastructure strategy. Tamil Nadu plans to establish 20,000 public EV charging stations over the next five years through the PPP model, with Rs 50 crore allocated during the current financial year. An additional Rs 5 crore will be provided as subsidies to Resident Welfare Associations for installing EV charging infrastructure in residential complexes, supporting the development of charging facilities closer to where electric vehicles are parked and used.

The revised budget also includes significant consumer-support measures. The government has allocated Rs 1,545 crore to increase the free electricity entitlement for eligible domestic consumers from 100 units to 200 units for households whose bi-monthly consumption is up to 500 units. A total of Rs 18,860 crore has been earmarked for electricity subsidies covering domestic and agricultural consumers, while Rs 5,000 crore has been allocated as compensation to the Tamil Nadu Generation and Distribution Corporation.

Overall, the Energy Department has received an allocation of Rs 15,828 crore in the Revised Budget Estimates for 2026-27. The combination of rooftop solar incentives, battery storage policy, renewable-energy evacuation infrastructure, new substations, transformer replacement, smart metering and EV charging indicates that Tamil Nadu is attempting to address both sides of its future electricity challenge: increasing clean-energy supply while simultaneously modernising the networks required to deliver and manage that power.

The proposed Rs 1 lakh rooftop solar subsidy is therefore part of a much broader power-sector strategy rather than an isolated consumer incentive. As Tamil Nadu moves towards higher renewable-energy penetration and prepares for peak demand of more than 37,000 MW by 2035-36, distributed solar, energy storage, transmission expansion and digitalised distribution will increasingly need to operate together. If implemented effectively, the measures announced in the revised budget could accelerate household solar adoption while strengthening the state's ability to manage rising electricity demand and integrate a larger share of renewable power.