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Last Modified - 02/14/2022

Storage as Transmission-Only Asset (SATOA) PAC004

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Secondary: Planning Subcommittee (PSC)

Active: Planning Advisory Committee (PAC)

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The title of this issue was updated in March of 2021 from “Energy Storage as Transmission Reliability Asset” to “Storage As Transmission-Only Asset (SATOA)” to reflect FERC Order 172 FERC ¶ 61,132, which allows for the selection of a storage facility as a transmission-only asset (SATOA) in the MISO Transmission Expansion Plan (MTEP). 

2021 phase is to address required revisions in Business Practices Manuals (BPM) 20, 27, and 29 required to implement SATOA. The Planning Subcommittee (PSC) will initiate review in Q2 2021. 
Revisions will address:

  • BPM-020 Transmission Planning: Changes to conform to the approved SATOA Tariff language
  • BPM-027 Competitive Transmission Process: Revisions to the competitive process to evaluate and select a Proposal for a SATOA as an Eligible Project
  • BPM-029 Minimum Project Requirements for Competitive Transmission Projects: Technical requirements necessary to create the minimum design and performance requirements in a Request for Proposals for a SATOA project eligible for the competitive process

 The current MTEP Reliability Planning process includes the opportunity for Transmission Owners and other stakeholders to propose solutions to reliability issues identified as needed to meet applicable reliability planning criteria (NERC, Regional, Local). 

Today, such proposed solutions could include a battery storage device in the MTEP Reliability Planning study as a transmission solution to an identified transmission issue.  However, there are some challenges that should be addressed prior to the development of the MTEP19 Reliability Planning models and associated studies, in order to facilitate proper evaluation of these energy storage (ES) device solutions, should they be submitted in this upcoming planning cycle.  Among issues needing resolution:

  • Project proposal submission details - database technicalities
  • Interconnection requirements and process
  • Planning evaluation considerations / modeling (Includes Cost and Cost Recovery consideration necessary to evaluate ESR against alternative transmission asset solutions) 
  • Functional control / State of Charge 
  • Facility retirement 

Issue complete January 2022 with adoption of final BPM language. 

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