Bihar State Power Generation Company (BSPGCL) has commissioned the first phase of the 301 MW/495 MWh solar-plus-battery project in Kajra, Lakhisarai district, Bihar.

The project is being executed in two phases. The first phase includes a 185 MW/254 MWh solar-plus-BESS project, developed at a cost of ₹18.1 billion (~$200.74 million).

In the second phase, BSPGCL will develop a 116 MW/241 MWh project at a cost of ₹10.55 billion (~$117 million).

BSPGCl had awarded the engineering, procurement, and construction for the first and second phases of the project to Larsen and Tourbo (L&T) Renewables.

The project with the full capacity is estimated to cost ₹28.6 billion (~$317.2 million).

First Phase

The first phase of the project is established on a total land area of 689 acres.

Hithium Energy Storage supplied the BESS for the first phase of the project in 82 integrated LiFePO4 liquid cooling containers, each with a capacity of 3.44 MWh.

The power from the solar plus BESS solution will be delivered at the 132 kV switchyard and connected to the grid through the transmission line of the state transmission utility, via line-in-line from the existing 132 kV Lakhisarai-Haveli Kharagpur D/C transmission line.

Under the first phase of the project, the design life of the solar is proposed for 25 years, while the BESS component is expected to last 12 years.

The project is expected to maintain a capacity utilization factor of 22%.

The BESS will be designed to supply 45.5 MW for up to 4 hours, meeting 20% of the BSPGCL’s normalized daily solar power generation. The remaining power will be exported to the grid.

BSPGCL has submitted a petition to the Bihar Electricity Regulatory Commission for approval to supply power from the project at a levelized tariff of ₹4.3 (~$0.04)/kWh.

Second Phase

In November 2025, Lineage Power, a material subsidiary of Pace Digitek, received an order worth ₹1.9 billion (~$22.33 million) from L&T to supply 275,825 kWh of BESS in 55 integrated LiFePO4 liquid-cooling containers for the second phase of the Kajra project.

Under the second phase, the BESS must deliver a maximum power of 50.5 MW for four hours.

The solar-plus-storage project will deliver uninterrupted power for four to five hours during peak demand.

The second phase is expected to be commissioned by January 2027.

In 2025, renewable energy implementing agencies leaned towards integrating energy storage systems with renewable energy to address the intermittency of solar and wind energy generation.  In 2025, 11 renewables-plus-storage projects, with a total capacity of 9.85 GW, were auctioned. Solar projects integrated with energy storage discovered the lowest tariffs.

In October 2025, the Bihar Electricity Regulatory Commission set a target of meeting 43.33% of its energy requirements from renewable sources by the financial year 2030.