BrightSource Energy, a renewable energy startup that wants to build solar thermal plants which use sunlight reflected from mirrors to heat water to steam and power electricity-generating turbines, has pulled in $115 million. The investment was led by Google.org, Google's quasi-nonprofit arm; VantagePoint; BP; Statoil Hydro; and Black River, and brings the Oakland-based startup's total funding to $160 million. The company has already signed a contract to supply local monopoly Pacific Gas & Electric with 900 megawatts of power by 2016.