Tariff Administration 

As a Regional Transmission Organization (RTO),  MISO is responsible for administering its Open Access Transmission, Energy and Operating Reserve Markets Tariff and rate schedules and is the sole the sole decision-making authority on provision of transmission service. Administration of the tariff includes:

  • Calculating available transfer capability (ATC).
  • Evaluating and approving all requests for transmission service.
  • Performing transmission system impact studies.
  • Communicating with transmission customers.
  • Coordinating use and administration with other transmission providers in the region.

Transmission Service Requests

MISO Tariff Administrators consider requests for transmission service submitted to the MISO OASIS node and approve requests if transfer capability exists.

History of the Tariff

The Federal Energy Regulatory Commission (FERC) approved MISO’s initial Open Access and Transmission Tariff (OATT) in the fall of 1998. MISO began providing transmission service under its OATT on Feb. 1, 2002. FERC must approve any changes to the tariff. Learn more about the history of MISO.

Tariff Navigation

Easily navigate 1,800+ pages in the MISO tariff using the eTariff tool.

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