MISO requires organizations to register as Market Participants before participating in Open Access Transmission, Energy and Operating Reserve Markets. Your rights and obligations under the Tariff are determined by the market activities you identify during the application process.
Because the online registration tool is only accessible through our secure Market Portal, you’ll need to complete several steps before you can begin your registration.
Obtain a Digital Certificate
Next, obtain a client-side digital certificate from one of five MISO trusted Certificate Authorities. Note: Step 3 also requires a digital certificate. Check with OATI WebRegistry for a list of accepted certificate vendors.
Register with the OATI webRegistry
OATI WebRegistry replaced the TSIN Registry on November 13, 2012 and is now the system of record for electric industry information. Your registration should be in 'approved' status prior to moving on to Step 4.
Using the Online Registration Tool
We’ve developed an online tool to help you register as a Market Participant. You can access the tool once your system access request has been processed.
You are required to complete online sections and submit legal documents based on intended market activities. The type of market activities that you identify during the application process determine your rights and obligations under the Tariff, so please read the directions carefully.
Required Legal Documents
You’ll find the legal documents required for your organization in the online registration tool. Failure to submit them by stated Commercial Model deadlines will delay processing of your application. Download the documents, obtain the necessary signatures, then return them via overnight mail only to:
ATTN: Customer Service
720 City Center Drive
Carmel, IN 46032
The Network and Commercial Model Schedule indicates when Market Participants have opportunities to join the MISO.
For asset owning entities, applications must be received by stated Topology deadlines. Non-asset-owning entities may apply in accordance with stated Topology or Non-Topology deadlines.
Credit Application and Review
After receiving the credit application from the online registration tool, MISO conducts a thorough credit review to determine an Applicant’s ability to meet its financial obligations. In determining credit limits, we consider rating agency reports, financial conditions, third-party references and any other available information.
Credit approval is required before MISO grants Certified Market Participant status.
For more information on the MISO's Credit Policy, please refer to