UltraTech Cement on Wednesday said it will acquire 26 per cent equity of O2 Renewable Energy, a company engaged in the generation and transmission of renewable energy. This will help the Aditya Birla Group firm meet green energy needs, optimise energy costs and comply with regulatory requirements for captive power consumption under electricity laws. The cement maker company has entered into an energy supply agreement and share subscription and shareholders agreement with O2 Renewable Energy.