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There are no MISO specific fees to become a Market Participant.  You will, however, incur costs to  register on the OATI webRegistry, obtain Digital Certificates and post collateral with MISO to meet the credit requirements.
 
References
OATI webRegistry: https://www.naesbwry.oati.com/
Digital Certificates: https://www.identrust.com/, http://www.entrust.com/, http://www.oaticerts.com/
Credit Requirements: https://www.misoenergy.org/markets-and-operations/market-participation/credit/#t=10&p=0&s=&sd=
 

Keywords: Market Participant, Fee, Cost, Register, Registration, Incur, Incurred