FERC has directed SPP to submit a compliance filing for its proposal to unwind credit payment obligations assessed under Attachment Z2 of its tariff for transmission service taken from 2008 to 2016.
In an order issued Sept. 18 at its monthly open meeting, the commission determined that SPP lacked specifics in its proposed five-year plan to process about $138.5 million in refunded transmission service revenue credits paid during the refund period (March 2008 through August 2015) and an additional $8.2 million to refund point-to-point rates that increased during that time (ER16-1341).
FERC directed the RTO to explain how the refunds from entities that elect the payment plan will be allocated to entities owed refunds and to lay out how the plan interacts with a separate short-payments plan. It ordered the grid operator to clarify the allocation of “necessary revenue reduction in proportion to the outstanding net amounts owed by each entity on an aggregate basis after netting together the individual amounts payable and receivable for that invoice date.”
“We acknowledge that an option for a five-year payment plan could provide needed flexibility to the parties that must make repayments, but details of the specifics of the payment plan, and what the impact on refunds of this plan will be, remain open questions,” the commission wrote. “Accordingly, we direct SPP to explain how it would proceed both for entities that owe and are owed refunds in a situation where an entity selected the five-year payment plan option but was unable to pay refund amounts during the five-year period.”
SPP’s response is due within 45 days of the order.
The Z2 issue has dogged SPP since 2016, when the grid operator owed $147 million plus interest to transmission customers for the historical period. Staff said in October 2024 that interest at that time stood at $33.4 million. (See “Grid Operator Waiting for FERC Order to Resettle Z2 Funds,” SPP Markets & Operations Policy Committee Briefs: Oct. 15-16, 2024.)
Under the attachment, transmission upgrade sponsors receive credits from any upgrade users whose service could not be provided “but for” the upgrade. The attachment also requires the RTO to invoice the charges monthly and to make any adjustments within one year.
However, software problems delayed the attachment’s final implementation for eight years before 2016, during which the RTO did not invoice for the upgrade charges. FERC approved a waiver request to settle more than 365 days in arrears, but in 2019, the commission reversed course and said SPP should have settled Z2 from only September 2015 forward. (See FERC Reverses Waiver on SPP’s Z2 Obligations.)
In January 2022, the grid operator updated its proposed refund plan and made an informational update to the commission in September 2024. If approved, SPP plans to send out refund invoices with interest for the refund period, accrued to the current invoice date.
Once a new settlement system is deployed in the coming months, invoices would be issued for the September 2015-January 2020 operating days. Additional resettlements from February 2020 would be run monthly in the current settlement system, along with normal current day Z2 settlements, until SPP catches up to the operating month.
SPP told FERC that the refunds and resettlement, before interest on refunds, total at least $657.8 million (as of June 2024). That amount grows by between $3 million and $4 million each month, it said.
The RTO has said it expects to resettle everything in about four years.
2nd Order 2222 Compliance Filing
Also at the open meeting, the commission accepted SPP’s second Order 2222 compliance filing, subject to another compliance filing to be submitted within 60 days (ER22-1697).
FERC found that in SPP’s December 2024 filing, the RTO complied with the first compliance order’s directives related to the commission’s decision to decline its jurisdiction over the interconnections of distributed energy resources to distribution facilities for the purpose of aggregation. The commission also found that SPP met Order 2222’s requirements of allowing distributed energy resource aggregators to register aggregations under one or more participation models to accommodate their physical and operational characteristics and proposing a maximum capacity requirement.
The commission rejected protests by Advanced Energy United, Sierra Club and virtual power plant operator Voltus that SPP’s proposed 2030 implementation timeline is “analogous” to MISO’s. (See FERC Permits 2030 Finish Date for MISO Order 2222 Compliance.)
The commission said it rejected MISO’s first timeline because the RTO proposed to defer Order 2222 implementation for several years. It said SPP’s proposal to implement the order in the second quarter of 2030 complies with the requirement for a “reasonable implementation date with adequate support to show that the proposal is appropriately tailored for its region and implements Order No. 2222 in a timely manner.”
“Here, SPP is not proposing to defer Order No. 2222 implementation. Rather, SPP has adequately explained why an effective date five years from the commission’s acceptance of its revised proposal is appropriate for its region due to its implementation needs,” FERC wrote.
Approved in September 2020, Order 2222 directed all FERC-jurisdictional regional grid operators to revise their tariffs to allow DERs to participate in their capacity, energy and ancillary service markets. (See FERC Opens RTO Markets to DER Aggregation.)
