BURLINGTON, Vt. (WCAX) - A draft report shows a sweeping thermal energy bill under consideration in Montpelier, also known as the Clean Heat Standard, could cost Vermonters up to $17 billion.The price tag could change drastically depending on how the Global Warming Solutions Act is interpreted and how the numbers shake out.The Clean Heat Standard aims to reduce the use of fossil fuels in heating through things like weatherization and converting …