Now R??ter's Conergy AG, in Hamburg, is the second-largest solar company in the world by revenue.

FORBES: Sunny Optimist

Conergy has completed 40 of these projects, generating 55 megawatts.

FORBES: Sunny Optimist

Tightening solar cell supplies have hurt Conergy's margins.

FORBES: Magazine Article

R??ter says that from the day he started Conergy with a loan from his mother, he always used the best solar technology available and engineered his own hardware for mounting panels and connecting them to the grid.

FORBES: Sunny Optimist