Scroll down the page for these categories of FAQs:

  • Transmission Service Requests
  • System Impact Studies
  • Facility Studies
  • Other Procedures and Requirements  

Transmission Service Requests

How do I request transmission service?
Transmission Service customers need to make all requests using OASIS.

Do I need to get full access to the OASIS to make requests?
Transmission customers and market participants may register to request transmission service on OASIS.

Become a Market Participant 
Get access to OASIS

System Impact Studies (SIS)

How do I know if I need a System Impact Study for the transmission service?
After you request long term firm transmission service on OASIS, the Transmission Service Request (TSR) group engineer will post comments on OASIS about further actions.

What is the study deposit for a System Impact Study?
The study deposit is $20,000.

Is the deposit refundable?
MISO only charges for the cost of the study; therefore, any remaining balance after the study is completed, cancelled or withdrawn is returned to the customer.

When can I expect to receive the System Impact Study Agreement?
MISO will send a System Impact Study Agreement within 30 days after receiving the transmission service request on OASIS.

How long does it take for MISO to finish the System Impact Study?
MISO must finish the System Impact Study within 60 days.

What happens after the study results are posted to OASIS?
If the results indicate an acceptable transmission service request without requiring transmission upgrades, then the customer must submit two copies of the transmission specification sheets within 15 days of MISO’s request. If the results indicate that there are overloads that need to be fixed before service can be granted, then the transmission customer is offered a Facility Study Agreement.

What is the customer’s responsibility if there are no constraints and MISO agrees to accept the service?
The customer needs to submit spec sheets within 15 days after MISO’s request on OASIS.

What happens if the customer does not submit spec sheets within 15 days?
MISO will automatically retract the request from OASIS.

Facility Studies

When can we expect the Facility Study Agreement?
After the System Impact Study report is posted, Midwest ISO will e-mail a Facility Study Agreement within 30 days.

How long does the transmission customer have to sign the Facility Study Agreement?
A customer has 15 days to execute the Facility Study Agreement and send the $100,000 study deposit.

What happens if the customer fails to execute the Facility Study Agreement within 15 days?
MISO will refuse the transmission service request on OASIS. 

Are there any exceptions to the 15-day rule if the customer provides documentation explaining the delay?
No. According to Attachment J, MISO will be in violation of the Tariff if it accepts an agreement after 15 days.

Is any part of the Facility Study deposit refundable?
Yes. MISO only charges a customer for the actual cost of the study. MISO will return any remaining balance after completing and closing the Facility Study.

Other Procedures and Requirements

Is the customer responsible for paying Schedule 7 charges for point-to-point transmission service as well as the direct assigned transmission upgrade costs?
MISO has “and” pricing; therefore customers must pay both charges in addition to other charges depending upon the transmission service.

Can the customer submit eDNR for network integration transmission service after the transmission service is confirmed?
No. The customer is required to submit the eDNR form along with the spec sheets before MISO can grant service on OASIS.

If we submit a drive out point-to-point transmission service request and submit a corresponding service request on a neighboring transmission provider’s OASIS, are we required to sign the spec sheets within 15 days—even if we don’t have the other transmission provider’s study results?
Yes, with the exception of PJM. If the point-of-receipt or point-of-delivery is PJM, then MISO requests that the customer notify us when PJM’s results are available. Once the customer notifies MISO, we will require the customer to submit two copies of the spec sheets within 15 days.

Do we have to submit a five-year request to be eligible for rollover rights?
According to FERC Order 890, in order to be considered for rollover rights, the transmission customer must submit a transmission service request with at least a five-year term and give a one-year notice for renewal. Please check the posting on OASIS for more details.

Can we submit a rollover request for a redirect request?
Currently, there are no rollovers for the redirect requests but this may change in a couple of years depending upon North American Energy Standards Board (NAESB) recommendations on redirect renewal.

Can MISO provide conditional firm service based on its tariff?
No, MISO does not provide conditional firm service.