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Transmission Settlements and Pricing

The Monthly Transmission Settlements process financially settles Transmission Customers’ use of the MISO transmission system and our mandated, non-competitive Ancillary Services. Customer charges for transmission and Ancillary Services are calculated based upon the FERC-approved Tariff, and collected funds are distributed to Transmission Owners and providers of the mandated Ancillary Services. 

Transmission Settlements follows a calendar-month billing cycle by which MISO determines what charges Transmission Customers have incurred and the distribution of revenue to Transmission Owners and/or generators.  Customers also may count on us for technical assistance and support on MISO Transmission rate-related matters. Our processes provide non-discriminatory reviews of Attachments O, GG, MM, SS, and ZZ submissions annually.

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Attachments, Schedules and TO Data

Transmission rates are effective as of the date of their posting and will not reflect any retroactive adjustments due to FERC Orders or any other reasons.


Per docket ER18-783, rate changes were processed to incorporate the updated 2018 projected Attachments O/GG/MM/ZZ net revenue requirements for certain MISO Transmission Owners to reflect recent tax law changes included in the Tax Cuts and Jobs Act, approved by Congress on 12/22/17. For purposes of this update, the certain MISO Transmission Owners reflecting a reduction in federal corporate tax rate (and other related changes, as applicable) include the following:

  • Allete, Inc. dba Minnesota Power (MP)
  • Ameren Illinois Company (AIC)
  • American Transmission Company (ATC)
  • Ameren Transmission Company of Illinois (ATXI)
  • International Transmission Company (ITC)
  • ITC Midwest (ITCM)
  • Montana-Dakota Utilities (MDU)
  • MidAmerican Energy Company (MEC)
  • Michigan Electric Transmission Company (METC)
  • Northern Indiana Public Service Company (NIPS)
  • NSP Companies (NSP)
  • Otter Tail Power Company (OTP)
  • Vectren Energy

Additional changes reflected in the update include the following:

  • Schedule 2
    • In the NSP TPZ, interim rates were approved for Red Pine Wind in Docket ER18-563
    • In the ELTO TPZ, interim rates were approved for Carville GT1, GT2 & ST in Docket ER18-554

The following schedules changed: 2, 7, 8, 9, 26, 26-A, 37, 38, and 45.


The overall impact on MISO system rates follows:

  • Schedule 2: 1.21% increase
  • Schedules 7, 8, & 9: 5.09% decrease
  • Schedule 26: 7.48% decrease
  • Schedule 45: 17.22% decrease

These changes are effective March 1, 2018.

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