For the purpose of improving the load range and NOx emission level of lignite-fired power plants, a new combustion technology, called NR-LE burners (NOx Reduction-Load Extension), has been developed in co-operation between Babcock-Hitachi and Fortum. A single-burner combustion test was performed in Japan with this new NR-LE type burner using Czech lignite. Adapting the flame-stabilization ring and a special additional air-nozzle resulted in achieving a stable flame, which enables: The burner minimum load to be less than 50% (Boiler load: 30-40%) Low NOx emissions of less than 200 mg/m(3) (6% O-2, dry base) The first commercial full-scale application of the NR-LE burner was by the IPP power producer in the Czech Republic (Sokolovska Uhelna, a.s: at Vresova Unit2 boiler with steam parameters 325 t/h, 535 degreesC, 13.5 MPa). The commissioning test runs of the new burners were carried out during September to October 2001. The boiler is now in commercial operation, with (i) a 30% minimum load without supplementary fuel, and (ii) lower NOx emission levels. (C) 2003 Published by Elsevier Science Ltd.