Generator Interconnection Studies & Agreements

1. Generator Interconnection Studies & Agreements Charles Hendrix

2. Generator Interconnection Service • Energy Resource Interconnection Service – allows a generator to be eligible to use the existing firm or non-firm capacity of the Transmission System on an “as available” basis • Customer must still request Transmission Service • Network Resource Interconnection Service – allows the Transmission Owner to construct the necessary upgrades to integrate the generator into the Transmission System in a manner comparable with other Network Resources • Customer must still request Transmission Service

3. Generator Interconnection Service • Neither Energy Resource Interconnection Service or Network Resource Interconnection Service gives the generator any right to deliver energy to any customer or point of delivery

4. Generator Interconnection Studies Process • Definitive Interconnection System Impact Study (DISIS) – Studied in Clusters • Facility Study • Limited Operation Study • Interconnection Agreement

5. DISIS – Powerflow Analysis • Models built from the Integrated Transmission Planning Models • Includes all upgrades with NTC • Includes a look over the 10 year planning horizon so no short term outages accounted for • SPP Footprint divided into 12 sub-regions (groups) for interconnection study purposes

6. DISIS – Powerflow Analysis • Distinct dispatch for each interconnection request in the cluster study for each season • All Energy studied to be sunk in SPP footprint

7. DISIS – Powerflow Analysis • AC Contingency Analysis • Constraints Identified and transmission reinforcements required for • ERIS – overloads with 20% sensitivity factor • NRIS – overloads with 3% sensitivity factor • Neither ERIS nor NRIS conveys right to deliver • Upgrade Costs shared on a MW impact basis

8. DISIS – Transmission Upgrades • If long lead time upgrades with NTC are found to mitigate the constraints identified in the DISIS Study, this is documented in the study as a required upgrade for the Generator • This requirement also documented in the Generator Interconnection Agreement (GIA)

9. Facility Studies • Performed by the transmission owner • +/- 20% estimate of interconnection facilities and network upgrades • Short Circuit Analysis – verify circuit breaker duty ratings

10. Limited Operation Impact Study (LOIS) • Customer may request to interconnect before the completion of long lead time upgrades identified in the DISIS • An additional study (LOIS) is evaluated taking the following into consideration • Customer’s requested COD • Higher-queued generation in service • Neglecting generators that haven’t built • Existing transmission infrastructure

11. Limited Operation Impact Study (LOIS) • AC Contingency Analysis • Constraints Identified – LOIS may be denied (or temporary cap identified) for • Overloads with 20% sensitivity factor • Otherwise Generator can interconnect on ‘as available’ basis until higher queued generator comes into service • Conditions documented in GIA

12. Interconnection Agreement • Draft GIA presented to Customer after completion of Facility Study • Customer given 60 days to negotiate with transmission owner for construction milestones • GIA is finalized, executed, and filed at FERC if necessary

13. Questions