This article presents background and the test results for a NOx control solution applicable to pulverized coal-fired power plants (E-NOx) that resolves the operating challenges related to use of Low/Ultra-Low NOx burners (LNB) for in-furnace control and SCR or SNCR for post-combustion nitrogen oxides reduction. The major results of CFD modeling and test data are presented, which confirms E-NOx capabilities to reduce NOx and consequently consumption of ammonia/urea for units using post-combustion NOx control. Basic steam plant performance analysis per ASME codes in combination with tests data suggested appreciable reduction of a plant heat rate. The results of economic studies of E-NOx applications for power plants with different means of NOx control are presented in this article demonstrates a simple payback period to be within 8 to 16 months. This is the first environmental technology that pays for itself thanks to a decrease in both fuel and NOx reducing reactants consumption, thus lowering operating and maintenance costs in comparison with Best Available Current and Retrofit Technologies.