Curtis Wynn had a problem. Since 1997, Wynn has led the Roanoke Electric Cooperative in North Carolina. For a good chunk of that time, he'd been pushing for the cooperative's members to adopt clean technology. The problem? His members thought their bills were too high — some were paying more than $200 a month. A third of the co-op's members live in mobile homes and about a half live in single family homes — almost none live in apartments. Many of these buildings were badly in need of efficiency upgrades.