Item No.:                    7c_supp 
Meeting Date:         December 9, 2014 
Standby Power Facility 
Seattle-Tacoma International Airport

Passenger Experience 



2

Problem 
The Airport currently has backup generation capability for limited life/safety
functions. During a precipitating event (man-made or natural), the vast majority
of the airport's electrical functions cease to operate.

Risk of Power Outage is Not Quantifiable 
Impact of Outage is Very High 
Frequency of Power Outage is Low 
2009 Howard Hansen Dam Incident 
2008 Car Pole Accident 
- South Main Substation lost 
2006 Windstorm 
- South Main Substation lost 
- PSE lost 10 percent of transmission 
Power into Sea-Tac has a single point of
failure at the (230kV) Maple Valley BPA
Substation. 

3

30  60 Min After Power Loss 

Emergency Power 
(3 MW) 
Emergency Egress 
Lighting 

Areas Dark 
No Power 
C1 Pump 
Station 

C4 Area 
ACC/911    Ops
Concourse A                                                    Central Mechanical 
4th Floor          Toll Plaza   Police 
Plant
Communication rooms shutting down due    Emergency Lighting Only 
to high heat (~1hr)                    Equipment on UPS shutting down 
Capable of 1 Jet Bridge on Concourse A            IT Equipment (Port & Airline) 
TSA Screening Machines 
Bathroom Egress Lights 
4

2013 STIA Peak Load (17.5  21 MW) 
22,000     Future Demands 
Airport Expansion (IAF, Northstar) 
August 
Electrical Ground Support Equip. 
21,000

20,000
Peak kW  19,000
18,000
Current Electrical Demands
17,000
Lights                              Comm. & Control Systems 
Elevators & Escalators                 HVAC & Environmental Controls 
16,000        Jet Bridges                         Information Technology Systems 
Baggage Conveyance                 STS, CNG Transportation Center 
Parking Garage                      Security 
15,000
Jan     Feb     Mar     Apr     May     Jun      Jul     Aug     Sep     Oct     Nov     Dec
STIA Peak Electrical Load by Month 
5

Back-up Power at Other Airports 
New terminals and operational buildings 100% Back-Up,
Atlanta (Hartsfield Jackson)
All others life/safety
Boston (Logan)         40% Back-Up with redundant utility power
Chicago (O'Hare)         100% Back-Up with redundant utility power
Dallas Fort Worth       10% Back-Up for Life/Safety only
Denver International      10% Back-Up for Life/Safety only
Bradley Terminal 50% -
Los Angeles (LAX)
Two new terminals 100% Back-Up
Las Vegas (McCarran)     100% Back-Up with redundant utility power
Honolulu            100% Back-Up with load shedding
Newark           75% Back-Up with more planned
Portland             60% Back-Up with load shedding
San Francisco         10% Life/Safety Only
St. Louis              100% Back-Up with load shedding


6

Standby Power Facility 
Scope: 
25 MW Standby Power Facility 
Expandable to 30MW 
48 hour fuel tanks 
SPF 
Dual fuel capable 
5 minutes to full capacity 
Preliminary Cost Estimate: $37.2 M 




7

Project Delivery Strategy 
Delivery Methodology: Building Engineering Systems 
- RCW 39.04.290 
- 2 step RFQ/RFP Performance Specification 
Benefits 
- Turn-key solutions available 
- Promotes innovative solutions from Industry 
- Majority of cost is generation equipment 
- Schedule: Ordering of long lead items during design 
RFQ / RFP Development: 3rd QTR 2015  4th QTR 2015 
Design: 1st QTR 2016  2nd QTR 2016 
Construction: 3rd QTR 2016  2nd QTR 2017 
Commission
Project         Develop Bid      Advertise                        Begin
Approval of
Approval       Documents       Project                     Construction 
Award 

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