Patna: : Bihar The solar energy journey is no longer limited to home rooftops. Across the state, government buildings, irrigation networks, reservoirs and public infrastructure are being converted to sources of clean energy, marking a decisive shift away from reliance on fossil fuels.At the heart of this transformation is the Jal-Jeevan-Hariyali Mission, under which Bihar Renewable Energy Development Agency (BREDA) has already equipped more than 12,800 government buildings with solar energy. Through the first two phases of its grid-connected rooftop programme, the state has created approximately 115 MW of decentralized solar capacity, reducing the burden on the conventional thermal power grid while reducing the cost of electricity for public institutions.More importantly, the initiative has transformed from a project to a policy. Incorporating renewable energy into Bihar’s future development model, solar infrastructure is now mandatory for all new government buildings. About Rs 575 crore was invested in the first two phases.The next phase promises to be even more ambitious. according to Rahul KumarDirector of BREDA and Managing Director of NBPDCL, the state aims to install 500 MW of rooftop solar capacity on government buildings through the Renewable Energy Services Company (RESCO) model. The objective is clear – to achieve almost complete solar coverage of public infrastructure within the next five years and establish a strong foundation for Bihar’s clean-energy ambitions by 2030.The scale of progress is already visible. Patna leads the state with 1,701 solar-powered government buildings, followed by Purnia with 1,635 and Rohtas with 1,056. Together, they explain how public infrastructure is becoming a key driver of Bihar’s renewable energy transition.Yet Bihar’s solar strategy extends far beyond rooftops. Unlike states like Rajasthan and Gujarat, Bihar faces a unique challenge – the lack of large tracts of barren land suitable for utility-scale solar projects. As a result, the state has adopted a diversified approach, identifying suitable locations in districts such as Aurangabad, Banka, Jamui and Gaya for large-scale establishments.The proposed 150 MW solar park in Aurangabad is a major milestone. Spread over 500 acres and costing about Rs 1,000 crore, the project will include battery storage capable of storing up to 20% of the electricity generated, helping address the intermittent nature of solar power.At the same time, the major Kajra solar project in Lakhisarai has come into operational mode. 185 MW of solar capacity supported by battery storage has already been added in the first phase, slated for February 2026. The second phase, to be completed by January 2027, will further strengthen the project and increase storage capacities.Recognizing the limitations of land availability, Bihar is also exploiting its water resources. A 10 MW floating solar project at Phulwariya Dam in Nawada is nearing completion, based on earlier floating installations in Darbhanga and Supaul. Such projects maximize energy production without competing for agricultural land.The state is also investing in long-term energy storage as well. The two proposed pumped storage projects in Nawada, with a combined capacity of 2,120 MW and an estimated cost of Rs 12,000 crore, are currently under survey.Along with these efforts, Bihar is pursuing feeder-level solarization under the PM-KUSUM scheme. Power purchase agreements for 456 MW across 175 solar plants have already been signed, the initiative aims to shift agricultural irrigation systems towards dedicated solar power.Together, these projects reveal a larger vision. Bihar is not just adding renewable energy capacity; It is redesigning its energy architecture. Combining rooftop solar, utility-scale projects, floating plants, battery storage and agricultural solarization, the state is building a diverse and resilient clean-energy ecosystem capable of fueling sustainable growth for decades to come.