"VC funding (including private equity and corporate venture capital) for smart grid companies increased slightly to $425 million in 57 deals compared with $384 million in 74 deals in 2014," Mercom Capital Group said in a statement.
Total corporate funding, including debt and public market financing, equalled $527 million compared with $844 million in 2014, it said.
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Battery or storage companies brought in $397 million in 37 deals as against $431 million in 34 in 2014.
Funding for the energy efficiency sector increased to $852 million in 67 deals compared with $797 million in 80 in 2014.