Switching to cleaner-burning fuel will not be more expensive than installing scrubbers.

Northern Power can choose from among various kinds of scrubbers, some of which are more effective than others.

Northern Power is not necessarily committed to reducing harmful emissions from its plants.

Harmful emissions from Northern Power's plants cannot be reduced more by using both methods together than by the installation of scrubbers alone.

Aside from harmful emissions from the smokestacks of its plants, the activities of Northern Power do not cause significant air pollution.