Item No. 8a_supp 
Electric Utility Switching Project - Meeting Date: July 9, 2019 
Supervisory Control And Data
Acquisition(SCADA) 
Commission Meeting 
July 9, 2019 
CIP: 800699

Overview 
Request Commission authorization for the Executive Director to: 
1.  Increase the authorized funds for the Electric Utility Supervisory Control and
Data Acquisition (SCADA) project in the amount of $10,350,000 
2.  Advertise and award a major works construction contract at Seattle-Tacoma
International Airport 
3.  Use Port crews and small works contracts to assist with the project. 
Total estimated project cost is $11,950,000, an increase of $2,300,000 
Project presented to partner airlines on June 27, 2019 
Favorably received 
Majority in Interest (MII) approval expected in August 

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SCADA  What and Why 
Supervisory Control and Data Acquisition (SCADA) systems 
Data acquisition 
Networked data communication 
Data presentation 
Control 
Employee safety 


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SeaTac Airport Power Distribution System 
12.5KV Medium Voltage Distribution System 
Fed via 2 substations 
PSE Substation Sea-Tac  South Main Substation 
PSE Substation Bow Lake  North Substation 
Distribution to 26 Power Centers 
Alternate Utility Facility (AUF) integration 




4

Project Budget 
Previous approvals and estimates: 
Design authorization granted on August 4, 2015 for $1.6M with a
total estimated project cost of $9.65M 
Today's request: 
Increase total estimated project cost by $2.3M to $11.950M 
$2.3M increase includes: 
New Electrical Command & Control Center (EC3) room at $650K 
Required Puget Sound Energy Bow Lake substation upgrades at $900K 
Pre-design budget shortfall of $750K

5

Schedule 
Design Complete:   1st Quarter 2020 
Construction start:  2nd Quarter 2020 
In-use date:   2nd Quarter 2022 



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Questions? 
Thank you for your time! 


This Photo by Unknown Author is licensed under CC BY-SA 
This Photo by Unknown Author is licensed under CC BY-NC-ND 


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