About Us

Our Structure

Organized for maximum efficiency

Diamond or DGC is composed of five main subsidiaries:

Diamond Generating LLC is a world-class independent power producer with a successful track record as a developer, owner, manager and operator of power generation assets across North America.

Boston Energy Trading and Marketing provides energy management and optimization services to owners of generation and energy storage in North America and wholesale energy to retail power and gas suppliers.

Nexamp develops, owns, and operates a portfolio of solar and storage assets across the US with a primary focus on providing green energy and cost saving for clients.

Diamond Offshore Wind was formed by DGC to develop, own, and operate offshore wind projects in the U.S. Building on Mitsbushi Corporation's success in the global offshore wind market and DGC’s deep experience and outstanding performance as a U.S. independent power producer, DOW is uniquely positioned to be a strong, long term leader in the burgeoning U.S. market.

Diamond Energy is under development to become a leading competitive energy provider that offers consumers with reliable energy supply, transparent connectivity and innovative choices for how they energize their lives.

With offices in Los Angeles, Boston and Mexico City, Diamond currently has utility-scale generation ownership interests in:



7,800 MW

Total Capacity

3,300 MW

Net Equity

In addition to our group of companies, we leverage the global reach of Mitsubishi Corporation with other affiliate companies worldwide, all of which are leading players in the energy industry.

See Our Global Reach Across Mitsubishi Corporation