In 2017, BP invested $200 million to acquire a 43% stake in the solar energy developer Lightsource Renewable Energy, a company which was renamed Lightsource BP.[126][127] In March 2017, the company acquired Clean Energy's biomethane business and assets, including its production sites and existing supply contracts.[128] In April 2017, its subsidiary Butamax bought an isobutanol production company Nesika Energy.[129]