The ESCO (Energy Service Company) is a company where private companies provide energy saving services to building owners, the point that connects the performance contract that guarantees the energy saving amount is its special characteristics.
ESCO operators provide comprehensive services for building owners, including the diagnosis of energy conservation of factories and buildings, design and construction for the measures introduced, introduced equipment maintenance and operation management, provides, procurement of business funds, it realizes energy saving renovation without damages to the environment, in order to ensure the resulting energy saving effect. As a reward, ESCO operators will receive a portion of the energy-saving result from building owners (merit).

ESCO business is not merely reducing the environmental load, it is also one of an environmental businesses with merits.