Spruce CEO Nat Kreamer said: "Our residential solar lease and PPA, solar lending, and efficiency lending businesses are growing more than 50 percent so far this year, compared to 20-30 percent average growth in the residential solar industry.

"The capital markets have responded positively to that growth, and we expect to raise more financing for our solar and efficiency businesses from a variety of sources this year."

Kleiner Perkins Caufield & Byers (KPCB) partner and Spruce board of directors member Dan Oros said: "Spruce is building a sustainable business that brings value to all stakeholders.

"The Investec raise allows Spruce to grow alongside its channel partners."