Duke Energy Florida told the Florida Public Service Commission in an April 1 annual update of its Environmental Compliance Plan that it is working on new mercury controls for the coal-fired Crystal River Units 4 and 5 in order to comply with the federal Mercury and Air Toxics Standards (MATS).
The Duke Energy (NYSE: DUK) subsidiary said that earlier this decade it decided on these moves for MATS compliance:
- Anclote Units 1 & 2: DEF determined that the most cost-effective option for Anclote Units 1 and 2 is to convert them from oil to fire 100% natural gas rather than install emission controls in order to comply with MATS. The commission approved DEF’s petition to recover conversion costs and the conversion was done in 2013.
- Suwannee Units 1, 2 & 3: DEF determined that no further modifications are needed on these units in order to comply with MATS as they are currently capable of operating on 100% natural gas.
- Crystal River Units 4 & 5: DEF will utilize the existing electrostatic precipitators (ESPs), flue gas desulfurization (FGDs), and selective catalytic reduction (SCRs) for MATS compliance. DEF will also install chemical injection systems in 2015 to mitigate mercury re-emissions from the FGDs. DEF requested a one year extension for all mercury-related MATS requirements in December 2014. The Florida Department of Environmental Protection (FDEP) authorized a one-year extension to April 16, 2016.
- Crystal River Units 1 & 2: DEF determined that the use of alternative coals (along with dry sorbent injection, PAC injection, and ESP enhancements) is a feasible and cost-effective strategy to allow these units to continue running for a limited period of time in compliance with MATS and Best Available Retrofit Technology (BART) requirements until new generation can be built. This plan was approved by the commission in April 2014. Additionally, the FDEP granted a one-year extension to April 2016 for all MATS Units 1 and 2 requirements. With regard to Crystal River Units 1 and 2, the commission last year approved DEF’s need petition to construct the Citrus Combined Cycle Units which are scheduled for in-service in 2018 and will allow for the retirement of these coal units once the new combined cycle units are operational. DEF has also obtained permits necessary to install pollution controls needed to extend operation of Crystal River Units 1 and 2 in compliance with MATS and BART until the Citrus units are operational.