3/19/2024 Item 9
City Council
CITY OF Item #9: Informational Report
Regarding Route Analysis for
115kV Transmission Line
1852
RTC 24-1614
THE MISSION CIT
March 19, 2024
1 • SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
115kV Transmission Line
Northern to Kifer Receiving Station NORTHERN
RECEIVING
STATION
• Project Scope: Construct a new 115kV overhead adium
transmission line of approximately 2.24 miles between
Northern Receiving Station and Kifer Receiving Station. • Needed to accommodate approved and under construction Mission College
load growth and reliability
• Transfer additional power from new HVDC line (At NRS) and 101 NORTHA redistribute loads
KIFER
• System Operating Limit will be limited to ~ 819MW if SCOTT BL RECEIVING transmission line is not constructed STATION
• Key Items: constructability, existing utilities, power delivery, potential growth, aesthetics, tree removals, maintenance LEGEND
considerations, construction costs, and schedule • Route A Route B
• Informational report only - no decisions today Route C 2 POST MEETING MATERIAL
1 3/19/2024 Item 9
SILICON
VALLEY
POWER.
CTY OF SANTA CLARA
Schedule
Task Timeframe
Planning Jul. 2021 - Jul. 2022
Call for Proposals Jul. 2022 - Jan. 2023
Design Oct. 2022 - Nov. 2026
Easement Acquisition Jan. 2024 - May 2026
CEQA Jan. 2024 - Nov. 2024
CEQA Community Outreach Apr. 2024 - Jun. 2024
Permits Feb. 2024 - Nov. 2025
Material Procurements Oct. 2024 - Nov. 2026
Construction Advertising & Awards May 2026 - Nov. 2026
Construction/Close Out Nov. 2026 - Mar. 2028
3 SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
Routes
NORTHERN
Studied Three Routes RECEIVING
STATION
• Key consideration - feasibility and schedule (2028 OLe- completion date) San Tomas
Aquino Creek O
• Route C (Not Preferred) - West of San Tomas Aquino Creek • Majority within Creek boundaries © Mission College
• Replace existing 60kV line where available (101
• Easements and permitting - unknown if permits KIFER
would even be feasible and if feasible would not meet DOWER. -SCOTTIeL RECEIVING
STATION
schedule due to extensive permitting schedules
• Longest alternative
LEGEND
• Route A
Route B
Route C
4 2
3/19/2024 Item 9
SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
Routes
• Route B (Not Preferred) - Follows Route A on Lafayette NORTHERN
E RECEIVING
Street until diverging at Bassett and George Street to the STATION UPRR ROW and then crosses several private parcels to
KRS.
Lafayette! Agnew
• UPRR right of way is too narrow (concerns with Road
induced current on the rail lines and additional Street © Mission Collego
permitting and design review)
• Properties surrounding UPPR do not have sufficient 101) Bassett NORTH S CLA
George
space to place structures KIFER • Street
RECEIVING
• Require extensive easement costs and coordination SCOTT.BUG
STATION
• UPRR permits
Duane
Avenue
• Route A (Preferred) - Along Lafayette Street to Bassett LEGEND Route A
Street and Duane Avenue Route B
Route C
5 SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
Preferred Route
NORTHERN
RECEIVING
Total Route Spans 2.24 miles
STATION
OLek Stadium
• NRS to Agnew (Northern Segment)
• 0.74 miles
Lafayette Agnett
Road
• Overhead and underground
options © Mission College
• Lafayette Street (101
• Agnew to KRS (Southern Segment)
KIFER
• 1.5 miles SCOTT BIVO RECEIVING
STATION
• Replaces existing transmission
lines where available Duane
Avenue
LEGEND
• Lafayette Street, Bassett Street, Route A - Northern Segment Duane Avenue - Route A - Southern Segment
6 3
3/19/2024 Item 9
SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
Preferred Route
Northern Segment (0.74 Miles)
• Center median of Lafayette
Street
• No existing overhead
transmission
• Residential development on both
sides of Lafayette Street
• Studied both underground and
overhead
Looking South on Lafayette Street at Hogan Drive
SILICON
VALLEY
POWER.
CITT OF SANTA CLARA
Overhead Northern Segment
• Nine new poles within median
• Poles spaced every 350 feet on average and
~90-125 feet in height
• Located within existing ROW or easements
• Approximately $9.5 million
• Minimal utility relocation
• Would minimize landscape/tree removal as
part of design
• An overhead transmission line can deliver
more power and accommodate future
growth with the option for a future
underbuilt 60kV or 115kV transmission line Looking North on Lafayette Street just south of Hope Drive 8 3/19/2024 Item 9
SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
Underground Northern Segment
Approzimate Le malay tie sion More
Eistro Utility
• Constraints with constructability, schedule,
Electic Outbank wet foe 5 conduty
power deliverability, and aesthetics
Communication
• 25 existing utilities crossing or conflicts with ConsTron South of Agrew Ra.
Sound pota He
underground alignment in Lafayette Santary Sener South of Agnew Rid South of Agnew Rd
Wate South of Agnew R
• Requires relocation of 300 feet of two Nitral Gas (SP) South of Agnew Ra Ductbank with fre 5° conduts South of Agnew Rd
transmission gas mains for PG&E and DVR and one 4° consul Electria Ducbark ath four 5° conduts hom cane i
and one 4 condut
• The DVR shutdown can only occur twice a year Communicanon Nor ef Agnes Rd Nistral Gas (POSE)
Santary Seatr Beaten Hope De, and Agrew Rd
• PG&E work would be on PG&E schedule - will
Water (tersection of Hope Or.
not meet 2028 date Becaven Enervestr Do. and Hope
Nasural Gas - Transminsior Betacen Eisenhower De, and Hope 6-28
• Would also need to cross multiple utility lines
Bectic Intersesson of Enschone Dr.
Not of Evestoner Dr.
Could require not meeting minimum spacir 15° Srestight condut? North of Hogan De Santary Sewer Beaten Forway Gren Or. and Hogan
equirements or significant excavation up t
Natural Gas (PGSE) PersonFery Gun Doesn
20' deep PeacerFaren/ Gen te and ligan
Water
use CaseSP South of Fairway Gien Do
• Utty size is c
9 ATTACHMENT 4 - TYPICAL POLE TYPES -OVERHEAD SHIELD WIRE 30 KV RISER POLE
Underground Northern
TERMINATOR
Segment TRANSITION BETWEEN
OVERHEAD BARE CONDUCTOR OVERHEAD CONDUCTOR
TO UNDERGROUND CABLE) -(TWO SUB-CONDUCTORS
PER PHASE)
• Power Delivery: UNDERGROUND CABLE
TWO CABLES PER PHASE
• Can deliver up to 83% of the power of
ARRESTOR
overhead at 115kV due to heat dissipation (ELECTRICAL PROTECTION
FOR UNDERGROUND CABLE)
requirements.
DEADEND STRAIN INSULATORS
Further declines at the 230kV level to (INSULATED ATTACHMENT
VARIOUS SUPPORT HARDWARE POINT FOR OVERHEAD
79.9%. ARMS AND CABLE CLAMPS TO CONDUCTOR TO STRUCTURE)
SECURE CABLES AGAINST
• Underground alternative will limit MOVEMENT DURING OPERATION; future load growth and our ability to
serve currently entitled customers. CABLE SHROUD
(PHYSICAL PROTECTION FOR
EXPOSED UNDERGROUND CABLE)
• Aesthetics:
• Overhead alignment from NRS to riser
pole in median of Lafayette
• Additional riser pole just south of Agnew
on east side of Lafayette
• Approximately $19M (does not include CONCRETE FOUNDATION Typical Underground (SUPPORT FOR STRUCTURE AND
Riser Pole ENTRANCE OF CABLES INTO
PG&E costs) UNDERGROUND DUCTBANK)
10 5
3/19/2024 Item 9
Overhead Summary Discussion
Constructed
• SVP controls the schedule - can meet the 2028 at 230KV energization date without major gas line relocations or Energized DVR shutdown at 115KV
• Can accommodate future additional growth
• Can accommodate ~20% more power than the
underground alternative for already approved projects
7-
• Pole space provisions for future additional growth along Designed new transmission segments for 115KV-
• 50% less cost for the overhead northern segment compared (Future) 7-
to the underground alternative
• Ease of maintaining the system/restoration in emergency Typical
conditions Stacked
Configuration
11 • SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
Comparison of Northern Segment
Overhead Underground
Ability to meet 2028 schedule. Can not meet 2028 schedule Relying on PG&E for utility relocation
• DVR shut-down
Maximum transmission capacity Reduced transmission capacity Ability to accommodate future growth Lack of provisions for future growth Reduces construction disruption to the public Extended construction timelines with extended lane closures and traffic control
Ease of maintaining the system Longer restoration times in emergency situations Northern Segment Costs: ~$9.5 Million Northern Segment Costs: ~$19 Million Total Project Costs: ~$36 Million Total Project Costs: ~$45.5 Million 12 6
3/19/2024 Item 9
Preferred Route
Southern Segment (1.5 Miles)
• Initial perspective was to continue down the
median from Agnew to Montague (2,100
feet)
• Easier construction, less easements, cost
($2.15M)
• Opportunities to accommodate additional
future growth
• Did not recommend for aesthetic reasons
• Two existing 60kV overhead transmission
lines
1. East side of Lafayette Street Looking South on Lafayette Street just south of Agnew
2. West side of Bassett Street
13 Preferred Route
Looking South on
Lafayette Street just
south of Agnew
Southern Segment (1.5 Miles)
• Between Agnew and Montague, existing
60kV on the east side of Lafayette and west
side of Bassett would be replaced
• At Montague Expressway, continue on west
Looking South on
side of Bassett Street and replace 1,120 feet Bassett Street just of 6okV where existing and install 2,980 feet south of Montague of new overhead
• Final 980 feet of transmission line from just
north of Bayshore to KRS along Duane
Avenue would replace an existing 60kV
transmission line Looking South on
Duane Avenue just
south of Bayshore
14 7
3/19/2024 Item 9
* SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
South Of Agnew Segment
• 1.5 Miles of overhead lines (pole heights 110'-160')
• ~$4.3M estimated easement costs
From To Alignmer Approximate # Poles Poles
onsideratic of Easements Installed Removed
Agnew Road Montague East side of 4 Non-Residential 7 10 Expressway Lafayette and west Easements
side of Bassett
Montague Bassett and West side of 13 Non- 11 13*
Expressway George Street Bassett Residential
Easements
Bassett anc Kifer East side of 3 Non-Residential 7
heorge Stree receivin Bassett and Easements
Station Duane Street
*Distribution and
transmission
15 SILICON
VALLEY
POWER.
CITY OF SANTA CLARA
Next Steps
• Continue development of overhead design drawing package for 230kV primary and 115kV future underbuild along Lafayette and Bassett Streets
• CEQA Community Outreach
• Develop CEQA IS/MND for the project and return to Council in Fall 2024
• Prepare equipment specifications for long lead items (end of 2024, mid-2025, and end of 2025)
• Easement discussion and acquisition
• Construction contract award (Council action Q3, 2026) 16 8
3/19/2024 Item 9
City Council
CITY OF Item #9: Informational Report
IA Regarding Route Analysis for
115kV Transmission Line
1852
RTC 24-1614
THE MISSION CIN
March 19, 2024
17 Grain code Ram n
CAISO Transmission Line from
Hearsatan
PG&E Newark Station to SVP
Northern Receiving Station
• LS Power Project scope:
• Two High Voltage Direct Current (HVDC)
Terminals,
• +320 kV HVDC underground and overhead
transmission line between the terminals
(preliminary preferred route is ~8 miles)
• 230 kV interconnection at each station Legend
• Target in-service date by mid 2028 Existing Substation Preliminary New Project Terminal
• Monthly Project Coordination Meetings Preliminary Preferred Underground Cable Route (230kV HVAC)
• Future Interconnection Agreement between Preliminary Preferred Overhead Transmission Line Route 230kV
LS Power and SVP for Council Action. HVAC)
Preliminary Preferred Underground
Cable Route (320kV HVDC)
Preliminary Preferred Overhead
•= Transmission Line Route (320kV
18 9