DTE Energy is exploring electric vehicle integration and smart grid opportunities. They offer two electric vehicle charging rate options for residential customers - a time-of-use rate and a flat monthly fee. Under the time-of-use rate, customers charge 85% of their power during off-peak hours, showing charging can align with grid needs. DTE has also installed over 50 charging stations at their facilities and 34 available to the public. Workplace charging presents opportunities but also challenges around education, installation costs, and determining who pays for charging infrastructure and power costs.

1. June 5, 2013
EVS and Smart Grid Integration
ANA M MEDINA
DTE ENERGY
EVS and Smart Grid Integration
ANA M MEDINA
DTE ENERGY
Workplace Charging
Hawk Asgeirsson, P.E.
Manager - Power Systems Technologies
DTE Energy
asgeirssonh@dteenergy.com

2. DTE Energy is an Integrated Energy Company
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3. DTE Energy –
Electric & Gas Regulated Businesses
• Tenth largest US electric
utility
• 7,600 square mile service
• 2.1 million customers
• $4.9 billion in revenue
• Gen Capacity: 11,084 MW
• Annual Sales: 50,000 GWH
DTE Electric
• Eleventh largest US natural
gas utility
• 14,700 square mile service
territory throughout
Michigan
• 1.2 million customers
• 679 bcf of gas sales
• $1.8 billion in revenue
DTE Gas
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4. DTE Residential Program
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42%
58%
Flat
Charging Behavior
(Avg. % Usage during Off-Peak per customer)
Off Peak On Peak
85%
15%
TOU
Charging Behavior
(Avg. % Usage during Off-Peak per
customer)
Off Peak On Peak
PEV RATE OPTION #1
Time of Use (TOU)
PEV RATE OPTION #2
Flat Monthly Bill $40
Average Flat Rate Bill =
$41.60
Average TOU Bill = $30.
Incentive: Up to $2,500 to 2,500 Detroit Edison customers for EVSE & installation.
Two separately metered PEV rates offered – Flat Rate and Time-of-Use
(on-peak 9 AM to 11 PM M-F)
EV Rate (D1.9)1
Option
1
On-Peak 18 cents/kWh
Off-Peak 7.7cents/kWh
Option
2
Monthly Flat Bill: $40
Limited first 250 customers
Requires a 240 V separate meter
circuit

5. Workplace/Public Installations
DOE Workplace Challenge Partner
 Installed/facilitated 78 public/workplace
charging station in SE Michigan
 54 at DTE Energy facilities
 34 are publicly available
 Internal education
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6. Workplace/Public Installations
 Installation cost Level 2 – 240 volt
 $2,500 - $15,000
 Installation cost Level 1 – 120 volt
 $0 - $1,000
 What does it cost to charge
 Average charge 4.5 kWh ~ 50 cents
 INL public charging data
 8.4 kWh/week day ~ $1 per day (12 cents/kWh)
 15 DTE Energy employees own or lease
a PEV
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7. Workplace Charging Challenges
 Education and best practices for workplace
charging
 Installation options – Level 1 or Level 2
 Internal employee users group
 Who pays?
 DOE EV Everywhere Workplace Challenge
 calstart.org
 evworkplace.org
 goelectricdrive.com
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Questions?

11. Date: July 17 Tuesday
Day High Temp Low TempAvg. Temp
17 102 76 89
Distribution Circuit Load Graph
Summer 2012 high temperature day

12. Weekday Charging Profile
Comparison of TOU and Flat Rate
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0…
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AveragekW
Hour
Average of Flat-rate kWh
Avg
Average of TOD kWh Avg
Shaded = On-Peak

13. INL EV Project Data
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