Item No. ____4e_supp_____ 
Meeting Date: July 25, 2017 
Mechanical Energy Conservation
Stage 3 
C800658 
Seattle-Tacoma 
International Airport 

1

Port Legacy of 
Energy Conservation 
Airport completed over 50 conservation
projects since 2001 
Cumulatively, projects reduce 
~20% energy 
~3,000 metric tons/year GHG 
Annual energy bill by $1.9M (21%) 
Stage 1 Mechanical (2008) 
Stage 2 Mechanical (2014) 
Long-term savings from early conservation projects

Stage 3: Conservation Measures 
1. Improve chilled water production and distribution
network 
2. Demand based ventilation 
3. Air curtains 
4. HVAC constant volume (CV) to variable air (VAV) box in
Main Terminal 
5. Insulation 
6. Metering 
Conservation measures reduce both electricity and natural gas 
3

Stage 3: Main Terminal Door Air Curtains 
Install at 27 doors to Main Terminal 
Reduces conditioned air loss to outdoors with High Velocity Air
Curtains 



Infrared Heat Loss Image                  Normal Color Image              Example Unit  Sky Bridge 6 
4

Stage 3: Sustainability Benefits 
Contributes to two Century Agenda
objectives 
Reduces energy 
0.4% reduction in total electricity use 
6.1% reduction in natural gas needed to heat
Airport terminal 
Reduces 839 metric tons of carbon/year 
Reduces reliance on hydropower 
Increases energy resiliency 
Stage 3 advances our Century Agenda objectives 
5

Financial Return 
Energy Rate          Internal Rate    Net Present Value 
Assumptions          of Return        (NPV) 
(IRR) 
Renewable Energy        -0.3%          -$3.7M 
Rates 
Current/Historical         -6% to -7%      -$5.2 to -$5.5M 
Energy Rates 

Project justification based on sustainability benefits, not financial return 
6

Budget and Schedule 
Request          Total 
Project 
Design               $1.5M           $1.8M 
Construction           $5.3M           $5.3M 
Total                  $6.8M            $7.1M 
Schedule 
2018 Q3 - Complete Design 
2018 Q3  Start Construction 
2019 Q3  In use 
Request is $6.8M 
7

Questions? 

8