PSC: Storage as Transmission-Only Asset BPM-029 and BPM-027 (PAC004) (20210810)

During the August 10, 2021 Planning Subcommittee (PSC) meeting, MISO presented revisions to Business Practices Manual 027 (Competitive Transmission Process) and Business Practices Manual 029 Minimum Project Requirements for Competitive Transmission Projects to address Storage as Transmission Only Assets (SATOA) and requested Stakeholder feedback.

 The Transmission Owners request that the BPM language relating to Competitive Developer provisions for Storage as a Transmission Only Asset must be clear regarding the limitations on competition included in Order 1000 and reflected in Attachment FF with regard to existing transmission facilities, which may not be an Eligible Project open to competition:

• VIII.A.2.2. Upgrades to Existing Substations: Upgrades to existing substations include any expansions, replacements or modifications made, in part or in whole, to any existing substation or portion thereof that is owned by one or more Transmission Owners, and where some or all of the plant within the existing substation is classified as transmission plant. These upgrades include, but are not limited to: (a) Replacing facilities and/or equipment within an existing substation footprint; (b) Installing additional plant within an existing substation footprint; (c) Modifying facilities and/or equipment within an existing substation footprint; (d) Expanding an existing substation footprint within the existing substation site boundaries and installing additional plant within the expanded area; (e) Acquiring additional land adjacent to the existing substation in conjunction with installation of additional plant within the boundaries of this additional land, including facilities to interconnect such plant to the existing substation plant; and (f) Developing an additional footprint near the existing substation to facilitate effective expansion of the existing substation as further described below in Section VIII.A.2.2.1.