sentences:  With the rising cost of energy and the availability of efficiency technologies in lighting, HVAC (heating, ventilation and air conditioning), and building energy management, ESCO projects became much more commonplace.The term ESCO has also become more widely known among potential clients looking to upgrade their building systems that are either outdated and need to be replaced, or for campus and district energy plant upgrades.With deregulation in the U.S. energy markets in the 1990s, the energy services business experienced a rapid rise.