smart led streetlights arlington county 1. inventory overview 2
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Smart LED Streetlights
Arlington County 1
Inventory Overview
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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
Inventory
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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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150W HPS(180W)58W LED
68%www.lightingsupply.com
http://elementsofgreen.blogspot.com
What Are We Doing?
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Residential Group
Dusk – 8PM100%
11PM-Dawn25%
10PM-11PM50%
8PM-10PM75%
80%
http://elementsofgreen.blogspot.com
Dimming Program
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What does it mean?
* Considering 6,000 County lights only.
Power Consumption Savings
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Before
• 0.7 MkWh = 117 homes• $1.8 M in O&M• Reduction of 2,350 Metric
tons of GHG (5.2 Million pounds)
• 4 MkWh = 1,333 homes• $3.0 M in O&M• 9,300 Metric tons of GHG
(20 Million pounds)
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County Target: Emission per capita 13.2 to 3.0 Metric tons by 2050.
LED Conversion + DimmingWHAT WE GET?
• Investment - $6M• Payback – 5 years• Benefit to cost ratio = 6
Design life – 30 years
After
• CO2 emissions from 300,000 gallons of gasoline
consumed.
• GHG emissions from 500 passenger vehicles.
• CO2 emissions from 300 homes.
2,350 Metric Tons: A Perspective
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County LEDDom LEDDom HPS
Consumption kWh 20.3Distribution Service $/ kWh Basic Customer Charges $5.67 Distribution Charges 0.03 $0.61 Elec. Sup. Service (ESS) ESS Charge 0.01 $0.20 Rider R, S, T, B, W 0.01 $0.20Fuel Factor 0.03 $0.61 Sales and Surchages $0.01 Total $7.30
Rate ComparisonCounty LED Light 58 W Burning hours per year 4,200
Annual consumption per light
243,600 W (243.6 kWh)
Consumption / month 20.3 kWh (Tier 3=20-25 kWh)
Elec. Cost Per light $1.63 ($7.30 - $5.67)
Basic Cust. Charges $0.19 $5.67 distributed to 30 lights/meter
Total $1.82 $3.82 (w/maint) 15
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
($466.41 - $30 bulb)
Net saving
$1,651.71 +$1,309.23 = $2,960.94
Elec cost of County LED: $1.82
Including maint. : $3.82
Rate Calculations for DominionElectrical cost $1.82
LED luminaire cost $2.77*
Total $4.34
Add 25% for maint. $1.09
Total Monthly Cost $5.43 (per light)
* (Based on $639.71 luminaire cost and adding 30%
profit on top of that)
Some $ Facts
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Approx 35million streetlights in the US
Each HPS or MV contains: 10 – 100 mg
On average, 2,000kg of mercury on the US streets
2000kg not recycled, where does it go?
Mercury contents in LED: ....................0 kg
Mercury Concerns
Questions?
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Santosh Neupane([email protected])Project Manager, Streetlight Engineer703-228-0778Arlington County
Shahid Abbas ([email protected])Program Manager, ITS, Traffic Signals and Streetlights703-228-7588Arlington County
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