2020 & 2024 Final LCR Study Results Sierra Area Ebrahim Rahimi - PowerPoint PPT Presentation

2020 & 2024 Final LCR Study Results Sierra Area Ebrahim Rahimi Lead Regional Transmission Engineer Stakeholder Call April 10, 2019 ISO Public ISO Public

Sierra Area Transmission System & LCR Subareas Legend: Table Mountain Sierra Overall 230 kV 230 kV 115 kV Table Mountain 60 kV 60 kV Caribou 115 kV Palermo 230 kV Drum Sierra Area 115 kV Colgate Summit 230 kV Palermo 115 kV 115 kV Placer Spaulding 115 kV Pease 60 kV Summit 60 kV Pease E. Marysville 60 kV Bogue 115 kV Subarea 115 kV Placer Pease E. Nicolaus Subarea 115 kV 115 kV Rio Oso 115 kV Drum – Rio Oso Subarea South of Rio Oso 230 kV Palermo South of Rio Oso Subarea Atlantic Subarea Brighton 230 kV Gold Hill 230 kV 230 kV Lodi Lake 230 kV 230 kV Lockeford 230 kV Eight Mile Rd 230 kV Bellota 230 kV Slide 2 ISO Public

New major transmission projects Project Name Expected ISD Year 2020 In Service Gold Hill-Missouri Flat #1 and #2 115 kV line reconductoring (May-18) Pease 115/60 kV Transformer Addition Mar-20 Year 2024 Rio Oso 230/115 kV Transformer Upgrades Jun-22 Rio Oso Area 230 kV Voltage Support Jun-22 South of Palermo 115 kV Reinforcement Project Nov-22 Slide 3 ISO Public

Power plant changes Additions: • No new resource addition Retirements: • No new retirements Slide 4 ISO Public

Sierra Area Overall: Load and Resources Load (MW) 2024 Generation (MW) 2024 2020 2020 Gross Load 1,798 1,847 Market/ Net Seller/ Battery 986 986 AAEE -22 -66 Solar 6 6 Behind the meter DG 0 0 Wind 0 0 Net Load 1,776 1,781 Muni 1,129 1,129 Transmission Losses 86 83 QF 39 39 Future preferred resource Pumps 0 0 0 0 and energy storage Load + Losses + 1,862 1,864 Total Qualifying Capacity 2,160 2,160 Pumps Slide 5 ISO Public

Pease Sub Area: Requirements Overload LCR (MW) Year Category Limiting Facility Contingency Table Mountain (Deficiency) Palermo 60 kV 115 kV Table Mountain – Pease Palermo – Pease 115 kV and 2020 B 59 60 kV line Yuba City unit Table Mountain – Pease Palermo – Pease 115 kV and 2020 C 88 Pease Pease – Rio Oso 115 kV 60 kV line 60 kV No X Pease 2024 B None None X requirement 115 kV Rio Oso Palermo – Pease 115 kV and Low voltage at 115 kV 2024 C 95 Pease – Rio Oso 115 kV Pease 115 kV Bus Contingency ISO Public Slide 6

Pease Subarea: Load Profiles ISO Public Slide 7

Placer Sub Area: Requirements Placer Higgins Bell Drum Gold Hill – Placer #2 Drum – Higgins Gold Hill – Placer #1 Overload Flint Newcastle Horseshoe LCR (MW) Year Category Limiting Facility Contingency (Deficiency) XX Gold Hill – Placer #1 115 Drum – Higgins 115 2020 B kV line and Chicago Park 56 kV line unit Gold Hill Drum – Higgins 115 Gold Hill – Placer #1 and 2020 C 93 kV line #2 115 kV lines Contingency Gold Hill – Placer #1 115 Drum – Higgins 115 2024 B kV line and Chicago Park 67 kV line unit Drum – Higgins 115 Gold Hill – Placer #1 and 2024 C 89 kV line #2 115 kV lines ISO Public Slide 8

Placer Subarea: Load Profiles ISO Public Slide 9

Drum – Rio Oso Sub Area: Requirements Palermo 230 kV Drum 115 kV Colgate Palermo 230 kV Pease LCR (MW) 115 kV Year Category Limiting Facility Contingency 60 kV (Deficiency) E. Marysville Bogue Placer 115 kV 115 kV Rio Oso 230/115 kV Palermo 230/115 kV #2 115 kV 2020 B 429 Pease E. Nicolaus #2 Transformer Transformer 115 kV 115 kV Rio Oso Rio Oso 230/115 kV #2 734 115 kV Rio Oso 230/115 kV 2020 C Transformer and Rio Oso (39 NQC/ X Rio Oso #1 Transformer Brighton 230 kV line 45 Peak) 230 kV West Sacramento X Atlantic 115 kV Brighton No Requirement due to Rio Oso 230/115 kV Transformer 230 kV Gold Hill 2024 B/C 230 kV Upgrade project 230 kV Lockeford Lodi 230 kV 230 kV Eight Mile Rd Bellota Overload 230 kV 230 kV Contingency ISO Public Slide 10

Drum Rio Oso Subarea: Flow Profiles ISO Public Slide 11

South of Rio Oso Sub Area: Requirements LCR (MW) Year Category Limiting Facility Contingency (Deficiency) Rio Oso 230 kV Rio Oso – Atlantic Rio Oso – Gold Hill 230 kV 2020 B 276 230 kV and Ralston unit Atlantic Brighton Gold 230 kV Rio Oso – Atlantic Rio Oso – Gold Hill 230 kV 230 kV Hill 230 2020 C 831 (88) Rio Oso – Brighton 230 kV kV 230 kV Lockeford 230 kV Lodi 230 kV Rio Oso – Atlantic Rio Oso – Gold Hill 230 kV 2024 B 185 230 kV and Ralston unit Eight Mile Rd Bellota 230 kV 230 kV Rio Oso – Atlantic Rio Oso – Atlantic 230 kV 2024 C 185 Rio Oso – Brighton 230 kV 230 kV ISO Public Slide 12

South of Rio Oso Subarea: Flow Profiles ISO Public Slide 13

South of Palermo Sub Area: Requirements Caribou 115 kV Table Mountain 230 kV Table Mountain LCR (MW) 60 kV Year Category Limiting Facility Contingency (Deficiency) Palermo Pease - Rio Oso Table Mtn.- Rio Oso 230 kV line 2020 B 1,091 230 kV 115 kV line and Belden unit Colgate Palermo DCTL of Table Mt. – Rio Oso 230 kV 1,569 Pease Pease - Rio Oso 115 kV 60 kV 2020 C and Colgate-Rio Oso 230 kV (142 NQC/ 115 kV line E. lines 148 Peak) Marysville Bogue 115 kV 115 kV Pease E. Nicolaus No additional requirements beyond what is needed for South of Rio 2024 B/C 115 kV 115 kV Oso and Placer sub areas. (274 MW) X X Rio Oso 115 kV Rio Oso 230 kV Overload Contingency ISO Public Slide 14

South of Palermo Subarea: Flow Profiles ISO Public Slide 15

Sierra LCR Area Overall: Requirements Contingency Overload Caribou 115 kV Table Mountain 230 kV Cate LCR (MW) Table Mountain Year Limiting Facility Contingency X gory (Deficiency) 60 kV X No requirement beyond what is needed for South of Palermo 2020 B Palermo (1569 MW) 230 kV DCTL of Table Mtn. – Colgate Table Mountain – Palermo 230 kV 2020 C Palermo and Table Mtn. 1,764 Pease Pease 60 kV 115 kV 60 kV Rio Oso 230 kV lines E. Marysville Bogue 115 kV 115 kV Table Mountain – Table Mountain – Rio Oso 2024 B 788 Pease E. Nicolaus Palermo 230 kV 230 kV and Belden unit 115 kV 115 kV Rio Oso 115 kV DCTL of Table Mtn. – Table Mountain – 2024 C Palermo and Table Mtn. 1,304 Pease 60 kV Rio Oso Rio Oso 230 kV lines 230 kV ISO Public Slide 16

South of Table Mountain Subarea: Flow Profiles No reliable PI data was available ISO Public Slide 17

Changes from 2019 to 2020 2019 2020 Subarea Load LCR Load LCR Pease 150 92 159 88 Placer 168 77 172 93 734 Drum-Rio Oso N/A 506 N/A 831 South of Rio Oso N/A 831 N/A South of Palermo N/A 1,702 N/A 1,569 South of Table Mountain N/A 1,964 N/A 1,764 Total 1,758 2,247 1,862 2,068 LCR decrease is mostly due to new transmission project implementation. N/A=Flow-through area. No defined load pocket. Slide 18 ISO Public

Changes from 2023 to 2024 2023 2024 Subarea Load LCR Load LCR Pease 157 75 157 95 Placer 174 89 174 89 Drum-Rio Oso N/A 0 N/A 0 South of Rio Oso N/A 554 N/A 185 South of Palermo N/A <629 N/A <274 South of Table Mountain N/A 1,924 N/A 1,304 Total 1,822 1,924 1,863 1,304 LCR reduction in 2024 is due to new transmission project implementation and generation adjustment within adjacent subarea after the first contingency. N/A=Flow-through area. No defined load pocket. Slide 19 ISO Public

Sierra Area Total LCR Need Existing Generation Capacity Needed (MW) Deficiency (MW) Total MW Need 2020 LCR Need Category B (Single) 1,091 0 1,091 Category C (Multiple) 1,764 2,045 275 NQC/ 281 Peak Existing Generation 2024 LCR Need Capacity Needed (MW) Deficiency (MW) Total MW Need Category B (Single) 761 0 761 Category C (Multiple) 1,304 0 1,304 Slide 20 ISO Public