Hot dry rock geothermal energy Hot dry rock geothermal energy Hot dry rock (HDR) is an abundant source of geothermal energy available for use. A vast store of thermal energy is contained within hot - but essentially dry - impervious crystalline basement rocks found almost everywhere deep beneath the earth’s surface. A concept for the extraction of useful amounts of geothermal energy from HDR originated at the Los Alamos National Laboratory in 1970, and Laboratory researchers were awarded a U.S. patent covering it. Although often confused with the relatively limited hydrothermal resource already commercialized to a large extent, HDR geothermal energy is very different. Whereas
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