It’s clear to anyone paying attention to air pollution trends in New Hampshire that PSNH’s coal plants are a huge health and environmental liability for the state. And according to EPA data released last week, PSNH’s coal fleet continues to lead the state in toxic chemical releases: Merrimack Station in Bow remained New Hampshire’s number one toxic polluter in 2012, and Schiller Station in Portsmouth was number four.
That these largely coal-burning facilities (one of Schiller Station’s units burns wood) are still the biggest releasers of toxic chemicals in the state is even more sobering given that the capacity factors (the ratio of utilization of a unit compared to its potential) for PSNH’s coal units hit their lowest levels ever in 2012:
I’ll say it again: a coal plant running at less than 1/3 capacity (the Merrimack units together ran at 32.23% in 2012) still releases more toxic chemicals than any other facility of any type in New Hampshire. 2012 was also the first full year that the $420 million scrubber was operational at the plant.
While Schiller Station dropped from second place in 2011 to fourth place in 2012 in toxic chemical releases, it’s a good bet that Schiller will be back in the number 2 spot when the 2013 numbers are released next year. Why? Though they’re still very low, the capacity factor for Schiller’s coal units nearly doubled between 2012 and 2013 (from 12.54% to 22.95%).
The bottom line: Even with a $420 million pollution control project online and rock-bottom capacity factors, PSNH’s coal-burning units are the state’s worst and fourth-worst toxic chemical releasers. The Public Utilities Commission and New Hampshire Legislature should keep this in mind as they discuss the future of PSNH’s electricity generating assets.