The 55-MW dry-steam geothermal plant is situated on 350-acre area and was owned by Riverstone Holdings and US Renewables Group.
The plant is part of a broader complex of geothermal plants located within Geysers.
Following the acquisition, BCEP is planning to upgrade the facility which would include batteries that are expected to help the company manage supply and demand on the power grid in a better way.
The acquisition is expected to fulfill BCEP’s overall goal of aggregating assets that benefit substantially from improvements in advanced energy technology.
According to BCEP, it is being able to build a portfolio of clean energy assets by using AltaRock’s next generation enhanced geothermal energy systems called EGS.
AltaRock’s EGS uses hydraulic pressure to create a network of small, interconnected fractures in the rock that act as a radiator that transfers the heat in the rock to water circulating through the system.
BCEP CEO Aaron Mandell said: "The next step in our strategy is the integration of energy storage within existing plants.
"Bottle Rock is an extremely valuable asset given the project’s access to the Northern California energy markets and future expansion potential of the geothermal resource.
"In the near term, we will focus on safely maintaining the existing plant and well field, but are actively working towards adding performance enhancements to enable flexible generation using energy storage."
