Duke Energy offers many programs that could save you money and help you consume less energy. But you may not know about them, even as a customer because they can be difficult to navigate. Some of them are available here on their website.
Because many people have had trouble finding Dukes resources, MountainTrue has created a comprehensive resource guide to assist Duke Energy Progress and Duke Energy Carolinas customers which can be found in this document.
WNC Green Building Council also offers informational resources for new construction and for existing homes. They have a laundry list of energy efficiency resources here. And they offer a new efficiency benchmarking program called Green Gauge.