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Higher NOx prices may drive idling of coal units

  • : Coal
  • 22/06/27

US utilities may opt to idle a few coal-fired power plants this summer amid skyrocketing prices for NOx emission allowances.

Cross-State Air Pollution Rule (CSAPR) Group 3 seasonal NOx allowances have surged 14-fold this year. Argus assessed Group 3 allowance prices at $36,000/st on 24 June, up from $2,500/st on 3 January.

A number of utilities may need to buy NOx allowances by 1 June 2023 to meet their 2022 obligations under the CSAPR program. Typically, utilities would boost coal-fired generation in response to the kind of run-up in natural gas prices experienced this year.

But the higher allowance prices are complicating that decision making. And some utilities may conclude power prices are not high enough to justify the cost of needed allowances.

At the same time, utilities are already paying higher prices for coal because of a supply shortage in most regions of the US. Higher coal demand this year caught most producers by surprise, as they had already adjusted mining plans to account for retiring coal plants. And surging global demand has driven an increase in exports from Appalachia and the Illinois basin. The competition for that coal has driven prices to record levels.

Taken together, these factors have prompted utilities to watch costs closely. A few utilities say they may decide to idle coal-fired units.

One coal buyers said his company is still in the market for NOx allowances but has been having trouble finding enough. Other generators are competing for the same pool of allowances, while a few companies are holding onto allowances for future years, which is limiting available supply, he said.

Contributing to the NOx price rise is a proposal by the US Environmental Protection Agency (EPA) to [more than double the size of the Group 3 ozone NOx market](https://direct.argusmedia.com/newsandanalysis/article/2311171). EPA's proposal would expand the trading program next year from 12 to 25 states and set more aggressive NOx caps in an effort to help downwind states achieve the 2015 National Ambient Air Quality Standards for ozone. The proposal also would aim to greatly reduce the number of banked allowances in the new market.

The expansion of Group 3 is part of EPA's overall "good neighbor" plan to help cut smog across the US. It also calls for new NOx emissions for industrial sources in 23 states starting in 2026.

The CSAPR NOx market is demonstrating "the most complexity, volatility, and uncertainty I have seen," Aegis Hedging Solutions director of emissions trading Mike Taylor said.


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