We’re not sure what is happening, but Energy Innovations has lost another employee, just days after announcing its contract to build the largest corporate solar installation in the U.S. at Google.

VentureWire reports (sub required) that Arno Harris, the general manager of EI Solutions, the unit that does contracting for Energy Innovations, has left the company, to launch Recurrent Energy, a San Rafael start-up. It is reportedly a project developer providing distributed energy services to large energy consumers.

But based on Harris’ comments, about being an entrepreneur, and the fact that he’d served out his one-year contract at EI after the company bought his previous company, this may be quite understandable. Add to that the massive opportunity afforded to entrepreneurs in this area — given all the hungry venture capital being invested into solar companies — you’d expect this sort of thing to happen. Another employee, Brad Hines, also left EI two years ago, to start Practical Instruments, saying he could produce technology that fit better with industry standards.