Enerkon Solar International, Inc. operates utility scale PV power plants and renewable systems with focus on the Middle East and Africa. The company, through its subsidiaries, operates as an engineering, planning, and construction contractor. The company was formerly known as Castle Holding Corp. and changed its name to Enerkon Solar International, Inc. in November 2017. Enerkon Solar International, Inc. was incorporated in 1986 and is based in Delray Beach, Florida.