In the early 2000s, investors weren't very interested in SunEdison's business plan to finance solar with power purchase agreements."No one wanted to hear about physical infrastructure," said Jigar Shah, who drafted the business plan and co-founded the company.It took until 2006 to raise venture capital. But soon after, PPA customers started rolling in: Staples, Ikea, then Whole Foods."It was an idea who's time had come," said Shah. The PPA is now the backbone of solar.In this week's edition of the live podcast series Watt It Takes, Shah sits down with Powerhouse CEO Emily Kirsch to discuss his career in solar -- from Astropower to the Department of Energy to BP Solar and, eventually, to founding (and leaving) SunEdison.Jigar talks about why he left SunEdison, why he thinks Goldman Sachs was a terrible board member, and why cleantech entrepreneurs are taking really dumb money.Watt It Takes is a live interview series produced by Powerhouse in partnership with GTM. The conversation was recorded live in Oakland, California.This podcast is brought to you by CPower Energy Management. Find out more about CPower's demand-side energy management solutions.Listen to our other episodes of Watt It Takes:Nancy Pfund’s Pro Tips for Getting Started in CleantechSunPower Founder Dick Swanson’s Guide to Launching a Cleantech StartupLessons From the Fall of SungevityDan Shugar, the K​ing Midas of SolarA History of Greentech Media With Scott ClavennaSungage's Sara Ross on Starting a Solar Loan CompanyLike our shows? Make sure to give The Interchange and The Energy Gang a rating and review on Apple podcasts. And make sure to subscribe to both shows on Apple podcasts, Google Play, Stitcher, or anywhere you get your podcasts.