2026-GEN 00005 Published On: 05/15/2026
Question: A question for the 2026 Solar RFP and 2026 SC BESS RFP: If our project is contracted with Duke as a PV-only PPA but we have supplemental BESS being brought into the IC queue, can Duke contract with that BESS as a separate PPA?
Answer: No, in the upcoming 2026 SC Battery RFP the Companies are seeking South Carolina sited standalone storage bids that do not share an interconnection agreement with an existing generator and therefore are grid charged. To come through the solar and SPWS RFP, a project would be bid as SPWS from the start so that there is one contract governing the solar and paired storage collectively.
2026-GEN 00004 Published On: 05/12/2026
Question: Can you confirm there are no PSCAD / PSSE models due at time of IX application or RFP submittal for the 2026 Solar RFP and the 2026 SC BESS RFP?
Answer: PSSE models are required at the time of the interconnection application. Sections 7h, 7i and 8h of the Inverter Based Resource Data Request form located on the OASIS site (Duke_Energy_Inverter_Based_Resource_Data_Request_Form_(DEC,DEF,DEP).pdf (oati.com)) provides guidance for inverter and reactive power PSSE modeling.
2026-GEN 00003 Published On: 04/23/2026
Question: The RFP is ambiguous in projects that are qualified to bid based on Section III (g) of the RFP document. Can a project with a terminated PPA and a terminated IA bid for the RFP even if the PPA was executed in a prior RFP year between 2022 and 2025?
Answer: Market participants that have been selected in a prior RFP that have elected to terminate their Power Purchase Agreement and Interconnection Agreement (and pay any associated penalties) are eligible to submit a new Interconnection Request into the Resource Solicitation Cluster for 2026 and bid into the RFP. The project will be subject to all aspects of the 2026 RSC including the costs for the Interconnection Facilities and Network Upgrades identified in the 2026 RSC.
2026-GEN 00002 Published On: 04/16/2026
Question: For the 2026 RFP, will there be a new PV Curtailment portfolio view shared with market participants ahead of bids being submitted?
Answer: Please see the Excel file “Estimated PV Curtailment – 2025 CPIRP” showing the estimated curtailment in future years available in the 2026 Solar RFP:Q&A Documents page of this website. It includes two potential scenarios based on the results of the 2025 CPIRP modeling: the Recommended (NTAP) Portfolio and the High Load Sensitivity Analysis Portfolio. This information is subject to change due to several factors including shifts in projected loads, the pending merger of DEP and DEC, and future policy changes.
2026-GEN 00001 Published On: 04/09/2026
Question: The 2026 RFP does not include standalone storage. Are there any plans to include standalone storage in the 2027 RSC, or any other solicitations?
Answer: The Companies are currently planning on holding a 2026 Solar and Solar Paired with Storage RFP and also a 2026 SC Battery RFP. The latter will only seek standalone storage sited in SC, as required in the SC Energy Security Act (aka “Act 41”). This RFP website will include more information on the 2026 SC Battery RFP in the coming weeks, as the 2026 SC Battery RFP is still in development and the docket is still open in SC (Docket 2025-217-E).