Combined Economic And Emission Dispatch Using Genetic Algorithm & Lambda Project explains a solution to solve CEED problem by using Lambda iteration. 

The harmful ecological effects caused by the emission of particulate and gaseous pollutants like sulfur dioxide (SO2 ) and oxides of nitrogen ( NOx ) can be reduced by adequate distribution of load between the plants of a power system. However, this leads to a noticeable increase in the operating cost of the plants. 

In this work, incremental cost is taken as the encoded parameter of GA and PSO, which makes the problem independent of the number of the generator units and also the total count of iterate for convergence reduces fast. 

download  Base paper on  Combined Economic And Emission Dispatch Using Genetic Algorithm & Lambda project .