Affordable Clean Energy Rule

In June 2019, U.S. EPA adopted the Affordable Clean Energy Rule (ACE). ACE replaces the EPA’s Clean Power Plan controlling CO2 from electric generating units.

As the ACE rule has now been finalized, the MPCA will be responsible for working with other state agencies and stakeholders to determine Minnesota’s best path forward for implementing the rule.

To communicate with MPCA staff about the ACE rule, email

Developing Minnesota's plan

The ACE rule requires each state to develop a plan for developing and implementing limits on carbon dioxide emissions (C02) at coal-fired power plants. This 111(d) plan must establish enforceable CO2 emission rates for each affected coal-fired electric generating unit; processes for monitoring, recordkeeping and reporting; and a schedule for compliance. The plan must be submitted to EPA by July 2022 for approval.

In Feb. 2020, the MPCA hosted a webinar to discuss preparing Minnesota’s 111(d) plan. Representatives from MPCA and U.S. EPA summarized the rule and addressed the timeframe for implementation planning, MPCA’s evaluation of compliance options, information requests of the utilities, and options for evaluating cost effectiveness. Stakeholders were asked to provide comment regarding which proposed path forward was preferred. The MPCA received three comments, representing three different stakeholder groups.

PDF icon Implementing Affordable Clean Energy Rule in Minnesota (aq4-31)

PDF icon Implementing Affordable Clean Energy Rule (ACE) rule comments received by MPCA (aq4-31a)

HTML icon Webex: ACE rule implementation in Minnesota (Feb. 2020)

Federal-level litigation involving the ACE rule is ongoing.

Moving forward: Stakeholder engagement

The strongest theme of the comments that the MPCA received was to make sure that stakeholders are involved in the process to implement the ACE rule and the development of Minnesota’s 111(d) plan.

Starting calendar year 2021, the MPCA plans to begin hosting additional stakeholder meetings to help determine the best 111(d) plan for Minnesota. Meeting times, dates, and agendas will be made available to the public when they become available.

Tell us what you think!

To communicate with MPCA staff about the ACE rule, email