economic incentives energy conservation measures економічне стимулювання енергозберігаючі заходи and enterprise energy savings fund capture efficiency communal services enterprise consumption of gas economic incentive tool economic-and-mathematical model energy efficiency energy intensity energy savings energy-capacious resources energy-saving potential final consumption of energy resources fossil fuels fuel and energy loss fuel consumption forecasting greenhouse gases emissions hierarchical energy-savings management system housing-and-communal industry implementation tool management stratification branches municipal services municipal supervisory board municipal system normative-and-legal regulation price elasticity coefficient prices and tariffs