Geothermal energy in the United States Geothermal Data System (NGDS). Through the NGDS, many older paper archives and drill logs that are stored at state geological surveys are now being digitized and made available for free to the public. The underground hot water and steam used to generate geothermal power may contain chemicals that could pollute the air and water if released at the surface. Hydrogen sulfide, which is toxic in high concentrations, is sometimes found in geothermal systems. Newer methods of generating geothermal power separate the hot steam collected underground from the steam used to power turbines, and substantially reduce the risk of releasing air-polluting
Duke Energy Center for the Performing Arts Duke Energy Center for the Performing Arts Duke Energy Center for the Performing Arts is the main venue for the performing arts in Raleigh, North Carolina. The naming rights to the center currently are held by Duke Energy (formerly Progress Energy), which purchased them from the city in 2005 for a 20-year term at the cost of $7.5 million. The original naming rights previously were held by Business Telecom, Inc. (now EarthLink)), and the facility was known as the BTI Center for the Performing Arts from 1997-2005. BTI Owner Peter Loftin donated $3.1 million to the center in 1999, matching