Associated Press: The fourth quarterly auction of carbon allowances raised more than $104 million for 10 Northeastern states to invest in energy efficiency and renewable energy programs. Officials announced Friday that all 30.8 million allowances offered on June 17 were sold for $3.23 each — 8 percent less than the March price of $3.51. Each allowance represents a ton of carbon that electric plants can release. Generators in the 10 Regional Greenhouse Gas Initiative states are required to buy …