The practice has developed a high profile as the Hollywood set and companies, such as Ben and Jerry's, purchase offsets to cancel out their own carbon dioxide-producing behavior. People also can make contributions on their own through various nonprofits to offset the carbon they produce from air travel and other activities in their daily lives.
Several nonprofits, such as Sterling Plant, specialize in offsetting carbon emissions for people.
Duke's program would amount to an expansion of the existing NC GreenPower program, which allows N.C. utility customers to contribute through their power bill payments to the development of renewable energy, including wind and solar power.
A 100-kilowatt block sells for $4.
The cost to customers of the new program still has to be worked out, said Duke Energy spokeswoman Paige Sheehan. But the money would go to organizations that plant trees and support specific projects, such as collecting and burning methane produced from decaying garbage in landfills, she said.
Duke would not make a profit but would simply pass the money on to the various organizations, Sheehan said.