WEST JEFFERSON, N.C. — Carolina Timberworks, a leading designer and manufacturer in the U.S. of architectural timber frames crafted from wooden timbers, announced the first phase of an initiative that has already achieved 95% Net-Zero Carbon Usage, by installing a rooftop solar array that will produce almost twice the electricity the company typically needs each week.     The project is projected to pay back the financial investment in just 12 years–which is a 7.1% rate of return.  And after 12 years, the power consumed by the company in creating timber frame structures at the facility will essentially be free.