Smart LED Streetlights
Arlington County
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Inventory Overview
Dominion
12,000
County 6,000
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Inventory
What does it mean?
• 12 Million kWh of electricity per year=2,000 homes.
• 3 Million dollars in operation and management.
• A crew of 4 FTE, a fleet of 4 service vehicles, 6,000
service requests.
• 9,300 Metric tons of GHG (County only – 2,800
Metric tons) = 20 Million pounds.
* Considering all 18,000 lights
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Smart Streetlight System
• Centrally controlled
• Improved roadway safety
• Reduced power
consumption and GHG
• Helps incident and
emergency management
• Proactive maintenance system
• GIS web based inventory
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Smart Streetlight System
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What Are We Doing?
150W HPS(180W)
58W LED
68%
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www.lightingsupply.com
http://elementsofgreen.blogspot.com
Dimming Program
Dusk – 8PM
100%
8PM-10PM
75%
10PM-11PM
50%
11PM-Dawn
25%
80%
Residential Group
http://elementsofgreen.blogspot.com 7
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Power Consumption Savings
Power Consumption (in thousands kWh)
What does it mean?
4,500.00
Total County Lights Upgrade
4,091.39
3,750.00
3,000.00
Total County Lights Upgrade
2,250.00
1,430.98
1,500.00
702.64
750.00
HPS Lights
LED Lights w/o Dimming LED Lights w/ Dimming
* Considering 6,000 County lights only.
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LED Conversion + Dimming
WHAT WE GET?
After
Before
• 4 MkWh = 1,333 homes
• $3.0 M in O&M
• 9,300 Metric tons of GHG
(20 Million pounds)
• 0.7 MkWh = 117 homes
• $1.8 M in O&M
• Reduction of 2,350 Metric
tons of GHG (5.2 Million
pounds)
• Investment - $6M
• Payback – 5 years
• Benefit to cost ratio = 6
Design life – 30 years
County Target: Emission per
capita 13.2 to 3.0 Metric tons by
2050.
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2,350 Metric Tons: A Perspective
• CO2 emissions from 300,000 gallons of gasoline
consumed.
• GHG emissions from 500 passenger vehicles.
• CO2 emissions from 300 homes.
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Rate Comparison
County LED
County LED Light
Burning hours per
year
Annual
consumption per
light
Consumption /
month
Dom HPS
58 W
Dom LED
4,200
243,600 W (243.6 kWh)
20.3 kWh (Tier 3=20-25 kWh)
Consumption
Distribution Service
Basic Customer Charges
Distribution Charges
Elec. Sup. Service (ESS)
ESS Charge
Rider R, S, T, B, W
Fuel Factor
Sales and Surchages
kWh
$/ kWh
0.03
0.01
0.01
0.03
Total
Elec. Cost Per light $1.63
20.3
$5.67
$0.61
$0.20
$0.20
$0.61
$0.01
$7.30
Basic Cust. Charges $0.19
($7.30 - $5.67)
$5.67 distributed
to 30 lights/meter
Total
$3.82 (w/maint)
$1.82
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Some $ Facts
 Installation Cost for LED:
$1,055.22
 4-yr Revenue Credit:
$680.16
 Life of LED
25yrs
 Current Re-lamping
6yrs
 Re-lamping Cost: (25/6)x$396.41 =$1,651.71
($466.41-$100 (cobra lum.)+$30 bulb)
 Fixture replacement: 3 x $436.41 =$1,309.23

Elec cost of County LED: $1.82

Including maint.
: $3.82
Rate Calculations for Dominion
Electrical cost
$1.82
LED luminaire cost
$2.77*
Total
$4.34
Add 25% for maint.
$1.09
Total Monthly Cost
$5.43 (per light)
($466.41 - $30 bulb)
Net saving
$1,651.71 +$1,309.23 = $2,960.94
* (Based on $639.71 luminaire cost and adding 30%
profit on top of that)
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Mercury Concerns
 Approx 35million streetlights in the US
 Each HPS or MV contains: 10 – 100 mg
 On average, 2,000kg of mercury on the US streets
Questions?
 2000kg not recycled, where does it go?
 Mercury contents in LED: ....................0 kg
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Contact
Santosh Neupane(sneupane@arlingtonva.us)
Project Manager, Streetlight Engineer
703-228-0778
Arlington County
Shahid Abbas (Sabbas@arlingtonva.us)
Program Manager, ITS, Traffic Signals and Streetlights
703-228-7588
Arlington County
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