An informative April 23 briefing on the progress and potential of geothermal energy, which can cut fuel costs by up to 50 percent. Led by US Senator Bernie Sanders, with practical insights by Vermont experts including John Caulo of Champlain College; Nick Manosh, whose company has been installing systems for decades; Jeff Williams, vice president with Spafford and Sons Water Wells; and James Ashley of Green Mountain Geothermal. Ground source heating can be a third the cost of oil, Sanders says, and installation can be offset by a 30 percent tax credit.