1. Photovoltaic and Storage Integration Workshop “Operational Issues” Kenneth Ragsdale October 15, 2012 ERCOT

2. 2 Presentation Outline October 15, 2015ERCOT Photovoltaic and Storage Workshop 1.Solar PV Resources a)Registration b)Testing c)COP values and telemetered values a)Limiting the Output from a Solar PV Resource b)Compliance (treated as an IRR) 2.Energy Storage Resources a)Registration (Currently Modeling as GR and CLR) b)NPRR 340 c)NPRR 461 d)Various Caps and Floors for Energy Storage Resources e)Mitigated Offer Cap (MOC) for Energy Resources f)ERCOT RTC/RTD Proposal g)FRRS Pilot (technology neutral) 3.Miscellaneous a)Limitations on when Storage Resources can withdraw from the Grid b)Capacity Demand Reserve Values

3. 3 Solar PV Resources October 15, 2015ERCOT Photovoltaic and Storage Workshop a)Registration b)Testing c)COP values and telemetered values i.Limiting the Output from a Solar PV Resource ii.Compliance (treated as an IRR)

4. 4 Storage Resources: Current Approach October 15, 2015ERCOT Photovoltaic and Storage Workshop

5. 5 NPRR 340 Introduction and Definition of Duration- Limited Resources October 15, 2015ERCOT Photovoltaic and Storage Workshop Posted 3/21/11, currently tabled Testing Requirements Qualifications for AS. (One hour requirement) ERCOT is drafting a new NPRR to provide a testing approach for Resources with unique operational restrictions (HSL and MPC) http://www.ercot.com/content/mktrules/issues/nprr/326- 350/340/keydocs/340NPRR- 23%20TAC%20Report%20080411.dochttp://www.ercot.com/content/mktrules/issues/nprr/326- 350/340/keydocs/340NPRR- 23%20TAC%20Report%20080411.doc

6. 6 NPRR 461: Energy Storage Settlements Consistent With PUCT Project 39917 October 15, 2015ERCOT Photovoltaic and Storage Workshop Posted 5/02/12, under discussion at RCWG Energy Storage Resource Wholesale Load Energy Storage Load Locational Price for when the ESR is net load for the 15 minute Settlement Interval. http://www.ercot.com/content/mktrules/issues/nprr/451- 475/461/keydocs/461NPRR-09_ERCOT_Comments_100512.dochttp://www.ercot.com/content/mktrules/issues/nprr/451- 475/461/keydocs/461NPRR-09_ERCOT_Comments_100512.doc

7. 7 Various Caps and Floors for Energy Storage Resources October 15, 2015ERCOT Photovoltaic and Storage Workshop Draft (un-numbered) NPRR posted on 2/15/12 WMS meeting page, still under discussion Draft changes to Verifiable Cost Manual posted on 1/27/12 ETWG meeting page, still under discussion Startup Offer and Minimum Energy Offer Generic Caps Energy Offer Curve Caps for Make-Whole Calculation Purposes Mitigated Offer Cap Mitigated Offer Floor Verifiable Costs Minimum and Maximum Resource Prices http://www.ercot.com/content/meetings/wms/keydocs/2012/0215/15_ draft_nprr_caps_and_floors_for_energy_storage_resources.dochttp://www.ercot.com/content/meetings/wms/keydocs/2012/0215/15_ draft_nprr_caps_and_floors_for_energy_storage_resources.doc http://www.ercot.com/calendar/2012/01/20120127-ETWG

8. 8 RTC/RTD Proposal and Energy Storage Resources October 15, 2015 1.The main components of RTC/RTD proposal are: Real-Time Commitment (RTC) Application Real-Time Dispatch (RTD) Application 2.The outputs of RTC are: Commitment Instructions for Generation, Load and Energy Storage Resources. 3.The outputs of RTD are: Dispatch Instructions (Energy MW Base points) for Generation, Load and Energy Storage Resources. LMP at all Settlement Points and Electrical Buses. Link to RTC/RTD Strawman: http://www.ercot.com/content/meetings/metf/keydocs/2012/0830/05_real_time_mkt _enhancement_strawman_8_24_2012.doc ERCOT Photovoltaic and Storage Workshop

9. 9 Fast Responding Regulation Service Pilot October 15, 2015 Scheduled for Board vote in November 2012. Pilots a new Ancillary Service that could be provided by Resources with limited duration. See September TAC presentation: http://www.ercot.com/content/meetings/tac/keydocs/2012/0907/11._Fas t_Responding_Regulation_Service_Pilot_Presentation_TA.ppt “Frequency Regulation Compensation in the Organized Wholesale Power Markets: http://www.ferc.gov/whats-new/comm- meet/2011/102011/E-28.pdfhttp://www.ferc.gov/whats-new/comm- meet/2011/102011/E-28.pdf ERCOT Photovoltaic and Storage Workshop

10. 10 Last Slide (Miscellaneous Issues) October 15, 2015ERCOT Photovoltaic and Storage Workshop Should there be any restrictions on when Energy Storage Resources can withdraw from the grid? What is the appropriate “Effective Load-Carrying Capability” for Solar PV and for Energy Storage Resources used in the CDR development?