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Operating Guides meet Storage As a Transmission Only Asset (SATOA)

MISO received FERC approval for Storage As a Transmission Only Asset (SATOA). This could open up more revenue streams for energy storage developers.

But, this SATOA is not a market resource. And does not belong in the generator interconnection queue. SATOA will be studied as any transmission project alternatives identified for a reliability need on the system. The key to operating SATOA (the SATOA owner operates the asset) is understanding MISO's role as a Reliability Coordinator. MISO as the RC is ultimately responsible for operating guides. SATOA operation (each SATOA would have an op guide) is codified in an op guide.

That op guide has the following details, picked up from MISO's FERC filing:

  • purpose of the SATOA facility,
  • coordination requirements between the Transmission Operator and MISO as the RC, for charging and discharging,
  • area or system load levels at which reliability issues may occur,
  • line facility outages that in combination could cause a reliability concern,
  • operational requirements of the SATOA needed to resolve reliability issues,
  • communication protocols, including that the SATOA may be discharged either by verbal communication between the RC and the TOP and/or that it may be discharged when triggered by automatic protective relay operation following a critical contingency,
  • limits on the operation of the SATOA above the maximum capacity determined to be needed to address the Transmission Issue, and
  • protocols to reflect the SATOA will not be used for congestion management when market congestion management protocols are available.

If transmission utilities increase their familiarity with storage via SATOA path, so be it.

The FERC docket # for MISO SATOA filing is ER20-588, for additional information.

Rao Konidena's picture

Thank Rao for the Post!

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