Georgia Power plans to tap one of the Savannah area’s industrial stalwarts for enough energy to serve the equivalent of more than 3,000 homes for a decade. State regulators approved the utility’s request to buy additional electricity generated by the burning of so-called biomass, including from International Paper’s Port Wentworth Mill. International Paper will supply Georgia Power with 4.6 megawatts of power for a period of 10 years. …International Paper says it generates 70% of power used at its mills by burning “bark and biomass residuals” rather than fossil fuels like natural gas and oil. The deal with Georgia Power will “allow us to make additional energy with upgrades to existing equipment at the (Port Wentworth) mill,” International Paper spokeswoman Kristie Inman said. …The U.S. Environmental Protection Agency has embraced that notion in its reporting on greenhouse gas emissions from the nation’s largest polluters by discounting biomass-related carbon releases.