When looking at the biggest changes to hit the fast-evolving US energy industry in the past 24 months, “you can talk about cost trends and sources of capital”, says Greg Wolf, who oversees Duke Energy Renewables as head of Duke’s commercial portfolio.

“But in a word I would say acceptance [of solar] is what’s really shifted for the industry … and that’s certainly true for Duke Energy," Wolf said Wednesday at the Solar Power International conference in California.

“There’s