ISO New England has just released its Electric Generator Air Emissions Report for 2011.  The bottom line?

• Total emissions of NO_x, SO₂, and CO₂ have decreased by 12.1%, 29.5%, and 10.2% from 2010 to 2011

• Emission rates for NOx, SO2, and CO2 have decreased by 8.7%, 25.8%, and 5.9% over the same time period

As our observant readers will have inferred, ISO reports that total energy generation was down by 4.6% from 2010 to 2011.  ISO attributes most of the emissions decrease to an increase in gas-fired generation and a corresponding decrease in coal- and oil-fired generation.  According to the ISO, coal consumption fell from 6.2 million tons to 3.0 million tons from 2010 to 2011, and residual oil consumption feel from 1.5 million barrels to 0.7 million barrels over the same period.

Taking a longer time horizon, the emissions decreases are more substantial, though CO₂ decreases are not as great as those for NO_x and SO₂.

• Total emissions of NO_x, SO₂, and CO₂ have decreased by 58%, 71%, and 11% from 2001 to 2011

• Emission rates for NOx, SO2, and CO2 have decreased by 60%, 73%, and 16% over the same time period (For reasons unknown to me, the ISO-NE reports the rate comparison for 2011 to 1999, but I have used 2001 as the baseline to make it apples to apples with the total emissions comparison)

The explanation for the decrease over the longer term?  “Increased use of new, more efficient natural-gas-fired power plants, a decline in the cost of natural gas, and the implementation of emission controls on some of the region’s oil- and coal-fired power plants.”

Sounds like a success story to me.  This blog is temporarily a sarcasm-free zone.