1. Pasadena Water and Power
Electric Vehicle Workshop
March 31, 2012

2. Topics
Pasadena Water and Power Electric Vehicle Workshop
• Plugging in to the Grid at Home
• Charge at Night…late at night (utility impacts)
• Cost of Gasoline vs. Home Charging
• PWP Incentives
• More Information
> www.PWPweb.com/EV
> Call the Program Answerline: 626-744-6970
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3. Plugging In to the Grid at Home
Pasadena Water and Power Electric Vehicle Workshop
• Your options
> 120 Volt wall socket (slooowwww)
> 240 Volt “Level 2” charger
• You will need permits for electrical work
> City Permit Center
• You may need to upgrade your service panel
> PWP Utility Service Planning
> Could trigger “undergrounding” requirement - $$$
• We can help guide you through
> PWP Answerline: 626-744-6970
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4. Sidebar: Energy vs “Demand”
Pasadena Water and Power Electric Vehicle Workshop
• Residential bills based on energy use (kWh)
• Demand (or power) is the maximum rate of
energy delivery to the customer (kW)
> Utility equipment and your electric service panel must
be sized to meet your maximum demand
• A microwave oven uses about 1 kW of power
> If you run it for 1 hour, then you consume 1 kWh
• A 100 W light bulb uses 0.1 kW of power
> If you run it for 10 hours, then you consume 1 kWh
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5. Power Demand (kilowatts)
Pasadena Water and Power Electric Vehicle Workshop
Typical Level 2
charger demand
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6. Charge at Night (Late)
Pasadena Water and Power Electric Vehicle Workshop
• Adding a Level 2 charger can be like adding
another house!
= !!!
• Delay charging to midnight - unplug by noon:
> Reduces strain on transformer feeding your house
> Reduces costs to procure energy
> Reduces need and cost to upgrade distribution
circuits and build new power plants
> ….Everybody saves!
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7. Demand (KW)
0
2
4
6
8
10
12
14
8/5/2009 0:00
8/5/2009 1:45
8/5/2009 3:30
8/5/2009 5:15
8/5/2009 7:00
8/5/2009 8:45
8/5/2009 10:30
8/5/2009 12:15
Pasadena Water and Power
8/5/2009 14:00
8/5/2009 15:45
8/5/2009 17:30
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8/5/2009 19:15
Date & Time
8/5/2009 21:00
8/5/2009 22:45
8/6/2009 0:30
Home Charging Scenarios
8/6/2009 2:15
8/6/2009 4:00
8/6/2009 5:45
8/6/2009 7:30
8/6/2009 9:15
Home Charging Scenarios
Delayed
Off Peak
Electric Vehicle Workshop
House Load
Uncontrolled

8. Utility Infrastructure Impact
Pasadena Water and Power Electric Vehicle Workshop
• Sparse EV adoption will not be a problem
• However…
EV “clustering” can
overload transformers
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9. Cost of Gas vs Home Charging
Pasadena Water and Power Electric Vehicle Workshop
• 800 miles/month (9,600 miles per year)
• Gasoline: $80-200 per month
Vehicle Type Mileage $4/gallon $5/gallon
Efficient Car 40 mpg $80 /month $100 /month
Less Efficient 20 mpg $160 /month $200 /month
• PWP Electricity: $35-70/month
> EV efficiency: ~0.375 kWh/mile => 300 kWh/month
> Electric costs varies significantly depending on your
current electric usage
> Time of Use (TOU) rates may reduce electric bills
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10. Time of Use Rates
Pasadena Water and Power Electric Vehicle Workshop
• Rates reflect varying demand on electric system
and costs to serve customers:
> Time of day:
 “On Peak” (daytime) – highest energy use
 “Off Peak” (night) – lowest energy use periods
> Season:
 Summer (June-Sept) – highest energy use
 Winter (Oct-May) – lowest energy use
• Designed to encourage “Off Peak” energy use:
> Lower costs, environmental impact
> Increase system reliability
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11. “Standard” TOU Rates (¢/kWh)
Pasadena Water and Power Electric Vehicle Workshop
• Customer pays for meter installation - $400+
• Could save $2.20/mo by charging Off Peak…
Annual
TOU Period Summer Winter
Average
On Peak 12.45¢ 8.89¢ 9.85¢
Off Peak 8.13¢ 7.89¢ 7.99¢
Flat Rate 9.32¢ 8.40¢ 8.73¢
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12. “Experimental” TOU Rates
Pasadena Water and Power Electric Vehicle Workshop
• Coming soon – watch PWPweb.com/EV
• Limited time offer for Residential EV owners
• May not be available for solar customers
> Technology and billing issues must be resolved
• Residential TOU meter installation fee waived
• Rates are set relative to the regular “seasonal-
flat” Residential electric rate:
> Lower cost “discount rate” at night
> Higher cost “premium rate” during the day
> Same discount or premium every day of the year
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13. “Experimental” TOU Rates
Pasadena Water and Power Electric Vehicle Workshop
• Two options choose from:
> EV-1: Discounted night and morning rates are limited
to a one year “trial period”
> EV-2: Greater savings for charging at night…
TOU Period EV-1 EV-2 Hours
On Peak +0 ¢ +4 ¢ Noon - 9pm
8am – Noon
Mid Peak -1 ¢ -2.5 ¢
9pm – Midnt
Off Peak -2 ¢ -4.5 ¢ Midnt – 8am
Savings* ($/mo) $ 6/mo $ 13.5/mo
*Savings vs flat rates when charging EV Off Peak 13

14. Experimental TOU Rates
Pasadena Water and Power Electric Vehicle Workshop
Flat
Rate
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15. Demand (KW)
0
2
4
6
8
10
12
14
8/5/2009 0:00
8/5/2009 1:45
8/5/2009 3:30
Off Peak
8/5/2009 5:15 (Midnt - 8am)
8/5/2009 7:00
8/5/2009 8:45
Mid
Peak
8/5/2009 10:30
8/5/2009 12:15
Pasadena Water and Power
8/5/2009 14:00
8/5/2009 15:45
On Peak
8/5/2009 17:30
(Noon - 9pm)
15
8/5/2009 19:15
Date & Time
8/5/2009 21:00
Mid
8/5/2009 22:45
Peak
8/6/2009 0:30
Home Charging Scenarios
8/6/2009 2:15
8/6/2009 4:00
Off Peak
8/6/2009 5:45
(Midnt - 8am)
8/6/2009 7:30
8/6/2009 9:15
TOU Rates Encourage Off Peak
Delayed
Off Peak
Charging and Household Energy Use
Electric Vehicle Workshop
House Load
Uncontrolled

16. PWP Incentives
Pasadena Water and Power Electric Vehicle Workshop
• Residential Customers
> No cash incentives for EV or charger
> Free energy use audit upon EV purchase
> “Bonus” incentives for energy efficiency retrofits
> Experimental TOU rates with Off Peak discount
> Waive TOU meter fee
• Commercial Customers
> Cash incentive of $500 for installing L2 chargers
accessible to public, limited to retail, entertainment
and hospitality locations (malls, restaurants, theaters,
parking lots)
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17. More Information
Pasadena Water and Power Electric Vehicle Workshop
• Pasadena Process and PWP Incentives
> PWP Website: www.PWPweb.com/EV
> PWP Answerline: 626-744-6970
• Other Resources
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18. Summary
Pasadena Water and Power Electric Vehicle Workshop
• Plugging in to the grid at home
> PWP can help with the process
• Charge at night…late at night
> Reduces costs and strain on infrastructure
• Filling the tank with electricity
> $35-70 per month for most residential customers
• PWP Incentives
> TOU rates and additional energy efficiency incentives
• More Information
> www.PWPweb.com/EV
> Call the Answerline: 626-744-6970
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