 volatile energy prices too. Rates are expected to rise by 5.4% each year for the next two years, then 5% annually through the year 2030. It translates to an additional $5 per month for a typical customer next year. Seattle City Light says that the hikes are necessary to maintain carbon neutral power amidst uncertainty. Drought conditions and population growth have forced the utility to purchase more expensive energy on the open market. Last year's expenditure reaching $100 million.