American Electric Power, Chevron and Equinor all participated in a round that increased the Stanford company’s total funding to $228m.

Mainspring Energy, a US-based on-site power generation technology developer based on research at Stanford University, received $95m on Tuesday in a series D round featuring energy utility American Electric Power (AEP) and oil and gas producers Chevron and Equinor. The round was led by Devonshire Investors, a private equity firm affiliated with financial services and…

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