A flue gas desulfurization system in a case power plant has remarkable advantages. The first is highly efficient in controlling air pollution, as it can remove sulfur dioxide produced into clean water which prevents acid rain from spreading and spares people suffering even more readily than before. Secondly however, installing an FGD system is a way to get stuck out of Environmental Protection Agency (EPA) penalties for failing regulatory requirements. With China's power plants become increasingly more prone to adopting stricter environmental measures and energy consumption this new rule has a greater significance in place of simply temporarily confining aberrant use that was once below the radar screen. Improper measures could see such a costly investment end up being futile or disastrously backfiring on itself with little return but much greater statutory penalties. Third, the environmental reputation of the plant will be greatly enhanced by having a FGD system installed. Fourthly, it cuts down on the cost of emission trading rights for plants that have effective FGD systems. So as a result, power stations with and without such FGDs are in fact trading or not quite taking up any business at all. These practical advantages make the station more economical and operationally robust in investors' eyes.