High energy prices and the discussions about CO₂ emissions have forced energy-intensive industries to look for more efficient combustion techniques. A very promising technique in this framework is High Efficiency Combustion (HEC), also referred to as High Temperature Air Combustion (HiTAC). This technique uses state-of-the-art regenerators to heat up combustion air to temperatures above 1 000 ^oC by means of hot flue gases. These high air temperatures result in a very efficient combustion process, while peak temperatures and thus excessive NO_x formation in the furnace are prevented by injecting fuel and air at high velocities. In this paper the results of a fullscale industrial test on High Efficiency Combustion in one of Corus’ reheat furnaces for steel slabs are presented. This paper also describes two other promising HEC applications at Corus.