The Bihar Electricity Regulatory Commission (BERC) issued the BERC (Terms and Conditions for Tariff determination from Renewable Energy Sources) Regulations 2025, specifying a generic tariff determination structure for renewable energy technologies. The technologies include biomass with rankine cycle, biomass gasifier, municipal solid waste/refuse-derived fuel, and non-fossil fuel-based cogeneration. These regulations enable BERC to establish feed-in tariffs for renewable energy projects with a capacity of less than 5 MW, including solar, small hydro, wind, and hybrid renewable energy systems. Tariffs for such projects will be determined through a competitive bidding process.

Tamil Nadu Green Energy Corporation invited bids to select developers to set up a 15 MW solar project, along with a 15 MW/45 MWh battery energy storage system, in Thiruvarur, Tamil Nadu. The last date to submit bids is December 29, 2025. Bids will be opened on December 30. The scope of work covers the design, engineering, procurement, and commissioning of the project under the build-own-operate mode. The project entails operation and maintenance for 25 years. Successful bidders must ensure that permits, licenses, insurance, and a no-objection certificate for grid connectivity for the project are in place.

Telecommunications Consultants India invited expressions of interest from consortium partners to install 13,043 kW grid-connected rooftop solar projects on government buildings in the Union Territory of Puducherry. The installations will be part of the upcoming tender (Tranche-V) by the Solar Energy Corporation of India (SECI). Bids must be submitted by December 1, 2025. Bids will be opened on the same day. The scope of work specifies the adoption of SECI’s detailed framework for the installation of rooftop solar systems in Puducherry. The selected solar power developers must design, engineer, commission, and operate the solar systems on government buildings across the Union Territory.

The Tamil Nadu Green Energy Corporation invited bids to set up a 15 MW solar power project with 15 MW/45 MWh battery energy storage system in Karur, Tamil Nadu. Bids must be submitted by December 26, 2025. Bids will be opened on the next day. TNGECL will provide 53.72 acres of land in K. Pitchampatti village, Karur, on a lease of ₹1 (~$0.011)/site/year. The designated interconnection point is the 110/11 kV Velliyanai substation, located 13 kilometers from the proposed project site. A railway line crosses between the existing 110/11 kV Velliyanai substation and the proposed project site. Hence, necessary approval must be obtained from the Southern Railway to lay the 33 kV underground cable for the railway crossing.

Noida-based rooftop solar solutions and products company Fujiyama Power Systems debuted on the stock exchanges after its initial public offering (IPO) of ₹8.28 billion (~$93.5 million) was oversubscribed 2.14 times. The price band was set at ₹216(~$2.4) to ₹228(~$2.6) per equity share, with a face value of ₹1(~$0.11). The IPO saw bids for 56 million shares, exceeding the 26 million shares on offer. Qualified institutional buyers led the demand, with a subscription rate of 5.15 times, followed by the employee-reserved portion at 1.47 times, and retail individual investors at 100%. The portion allocated to the non-institutional investors was subscribed 0.88 times. The company filed its draft red herring prospectus for its IPO in December 2024.

Power Grid Corporation of India (POWERGRID) approved the launch of its 83^rd bond issue under its 2025-26 program, authorizing the company to raise ₹38 billion (~$428.72 million). The bond issue has a base size of ₹10 billion (~$112.82 million) and a greenshoe option of ₹28 billion (~$315.90 million). POWERGRID said the bonds will be issued on a private placement basis. The bonds will remain unsecured, and no charge or security will be created in connection with the issue. The instruments will be redeemable at par in 10 equal annual instalments, with interest payable annually. The final coupon rate and interest payment schedule will be determined through bidding conducted on the electronic bidding platform.

Gujarat Industries Power Company (GIPCL) commissioned a capacity of 150 MW as part of the fourth phase of its 600 MW solar project at the 2,375 MW Renewable Energy Park at Khavda, Gujarat. The total capacity commissioned so far has reached 465 MW. The full 600 MW capacity is expected to be commissioned by the end of this year. GIPCL has a solar generating capacity of 652 MW at multiple locations in Gujarat. The company had commissioned a capacity of 105 MW each in the third, second, and fourth phases of the project. Gujarat Urja Vikas Nigam had invited bids for the 600 MW solar power project in September 2022. The tender had a greenshoe option for an additional 600 MW.

Rooftops can be a good choice for installing solar systems in the commercial and industrial sectors, thanks to their large rooftop spaces and fewer shaded areas. One such example is Oswal Soap Group, a soap manufacturer, which has saved ₹5 million (~$56,484.5) annually by installing a 162 kW rooftop solar system at its Jaipur factory in Rajasthan. The Oswal Soup Group specializes in the manufacture of detergents, bath soap, and other daily-use items, including tea, spices, and sanitary products. With high power needs, the soap manufacturer incurs an annual power expenditure of ₹7.5 million (~$84,726.8). To reduce its power costs, the company invested ₹4.5 million (~$50,836) to install a rooftop solar system on its premises. The rooftop system generates approximately 648 kWh per day and 19,440 kWh per month.

Researchers at the Massachusetts Institute of Technology reported the development of a lightweight, two-dimensional polyaramid polymer that can serve as a protective coating for solar cells, electronics, and infrastructure. The film, known as 2DPA-1, can be applied in thicknesses as thin as a few nanometers and can block nitrogen, helium, oxygen, methane, argon, and sulfur hexafluoride at levels significantly lower than those of any known polymer. This degree of impermeability, demonstrated in a study published in Nature, positions the material as a potential barrier to slow degradation and corrosion in technologies such as perovskite solar cells, packaged pharmaceuticals, and structural materials exposed to environmental stressors.