Hitachi Group has been dedicating a great effort to research and development of low NOx combustion technologies in response to global environment protection. For pulverized coal combustion, we firstly developed a unique low-NOx burner, HT-NR, based on the theory of “In-Flame NOx reduction”. For this sophisticated and proven design, and our continuous contribution to low-NOx combustion technology, we were awarded the JSME (Japan Society of Mechanical Engineers) Medal as well as the highest prize from Director-General of the Environment Agency. Our further effort has led to the development of the second-generation low-NOx burner, HT-NR2, which enhances NOx decomposition capability. The HR-NR2 burner system has been applied to both domestic and foreign boilers, and has received high reputation from all users. Complying with the increasing need of higher efficiency, easier maintenance, and lower cost, the third generation low-NOx burner, HT-NR3 with more simplified structure, was developed to realize the concept of a wider and shorter flame for extremely low NOx combustion. Its excellent performance was confirmed in an actual plant