Frederick-based BP Solar announced it had won a bid to develop 4.3 megawatts of solar energy systems for seven Wal-Mart stores in California.

Under the agreement, BP Solar will sell all of the energy produced by its solar modules as well as operate and maintain the systems. Wal-Mart will not have to make any initial capital investments, a benefit BP Solar gives to all its commercial customers.

By going solar, Wal-Mart will receive renewable energy credits from the output of the systems. The project is part of a much larger one to include 22 Wal-Mart locations in Hawaii and California. By Wal-Mart estimates, installing the solar power systems will help reduce greenhouse gases by as much as 10,000 metric tons per year.