USA Today: David Hall of Deltec Homes says his company doesn’t believe in cutting corners when making its trademark round homes – and that attention to detail extends to the electricity used to power the company’s plant. By year’s end, Deltec will be using 100% renewable energy at its factory, making it North Carolina’s largest private generator of solar power. Working with Sundance Energy of Mars Hill, N.C., Deltec has invested nearly $500,000 to install photovoltaic panels. On …