CHARLOTTE, North Carolina, Sept. 18 -- Duke Energy issued the following news release: * * * Duke Energy offers grants up to $20,000 for South Carolina programs that make homes ready for energy efficiency upgrades * Many homes across the state are unable to benefit from weatherization programs because of pre-existing health and safety issues * Qualified nonprofit organizations with existing programs can apply through Oct. 30 * Qualified South Carolina nonprofits can now apply for Duke Energ  more