THE DISTRICT HEATING AND COOLING SCHEME IN TRITON SQUARE, CENTRAL TOKYO, IS THE LARGEST SYSTEM OF ITS KIND IN JAPAN. IT COMBINES A LARGE-SCALE HEAT STORAGE TANK AND A HIGHLY EFFICIENT HEAT RECOVERY PUMP, USING ELECTRICITY AS A POWER SOURCE. THE SCHEME IS UP TO 40% MORE EFFICIENT THAN CONVENTIONAL SYSTEMS AND HAS LED TO A 60% REDUCTION IN CO2 EMISSIONS.