First in a 3-part series on rates in California. Learn how to save money on your electric bill with the PG&E E-20S rate. Get the scoop on demand charges, blended costs and project examples.

1. A quick review of
PG&E’s E-20S Rate
IceBank Energy Storage
Terry Andrews
CALMAC Manufacturing Corp.
tandrews@calmac.com
(714)585-6121

2. PG&E’S E-20S RATE:
WHY IT IS A FANTASTIC RATE
FOR ENERGY STORAGE
Energy Storage for a Cooler Future ™

3. CALMAC Mfg.
Corp.2012©
PG&E’s E-20 Rate, Secondary Service (>1000 kW)
• There rate is very similar to the E19 rate
• The energy charges are simple, the demand charges magnify
the difference between day and night time costs
Chabot College
Hayward, CA

4. CALMAC Mfg.
Corp.2012©
PG&E’s E-20 Rate, Secondary Service (>1000 kW)
• Demand charges are additive
– (Summer peak period is noon to 6pm, May thru October)
• Summer demand charges include:
+ $ 18.53/kW during peak period
+ $ 14.71 /kW for the maximum demand
• What the heck is a maximum demand charge?
– It’s a facilities penalty charge for high peak demand that occurs
during the previous month….independent of time. It is defined in
the rate sheet as follows:
“…the maximum-demand charge per kilowatt
applies to the maximum demand at any time
during the month.”
$32.24/kW

5. CALMAC Mfg.
Corp.2012©
Base Load
Lighting
Fans
Pumps
Cooling
0
200
400
600
800
1000
1200
1400
1600
1800
2000
k
W
Max. Peak Demand – $18.53/kW
Max. Demand - $14.71
Effective Total Demand:
$32.24/kW
PG&E’s E-20S Rate – Effective Demand Charges
Almost $50,000 per month
In demand (kW) charges!

6. CALMAC Mfg.
Corp.2012©
Base Load
Lighting
Fans
Pumps
0
200
400
600
800
1000
1200
1400
1600
1800
2000
k
W
Charging
Storage
600 kW Shed
PG&E’s E-20S Rate – Effective Demand Charges
Max. Peak Demand – $18.53/kW
Max. Demand - $14.71
Effective Total Demand:
$32.24/kW
Save!!!!
$19,000/month

7. CALMAC Mfg.
Corp.2012©
Summer “Blended” Costs – Day vs. Night
26.3 cents (Peak) vs. 7.3 cents per kWh (Off-Peak)

8. CALMAC Mfg.
Corp.2012©
PG&E’s E-20 Rate, Secondary Service (>1000 kW)
• In the winter (November through April) there is no
peak period, the part peak period covers the day.
• If we assume the building is an office or a building
with a similar cooling load profile the peak is likely
to occur between 2pm and 5pm.
• Thus, at this time the demand savings might be
derived from reducing the size of maximum
demand and the maximum part peak demand
……but this is a significant charge:
$14.99/kW

9. CALMAC Mfg.
Corp.2012©
Winter “Blended” Costs, Day vs. Night
15 cents (Peak) verses 7.4 cents per kWh (Off-Peak)

10. CALMAC Mfg.
Corp.2012©
PG&E’s E-20S Rate, Summary
• The demand charges are significantly large and make day
time energy costs expensive.
• Focusing only on energy efficiency ignores a large portion of
the bill (demand charges)
• There are potentially large savings when shifting load in a
daytime peaking building.
• Electricity in the summer is approximately 72% cheaper at
night
• Electricity in the winter is approximately 50% cheaper at
night

11. CALMAC Mfg.
Corp.2012©
Project Examples
Edwards AFB
CA
Encinitas Civic Center
Encinitas, CA
Nordstrom Dept. Store
Hawaii
Los Positas
Livermore, CA

12. CALMAC Mfg.
Corp.2012©
Project Examples
Irvine Presbyterian Church
Irvine, CA
Los Angeles Community College,
Los Angeles, CA
Chabot College
Hayward ,CA
California State Lottery
Sacramento, CA

13. CALMAC Mfg.
Corp.2012©
College Campus
University of Arizona
Tucson, AZ
Production
22 Chillers – 34,350 tons
205 CALMAC IceBank™ tanks at two sites
30,750 ton hours of storage
Distribution
7 miles of underground pipes
5,500,000 gallons of water in the loop
11 Pumps – 3255 HP (0.095 HP / ton of refrigeration)
There are no pumps outside of the chiller plants
62,260 gpm circulation capacity (1.8 gpm / ton)
12 psi - total campus pressure drop
16 degrees – average yearly temperature rise of the
chilled water
Loads
176 buildings
11,750,000 square feet (342 tons / ft².)
Notable Results
Distributes the chilled water at an average of
0.683 KW/ton. Includes everything, chillers,
pumps, towers.
Thermal storage is saving $423,000/year
($2,063/tank/yr)

14. CALMAC Mfg.
Corp.2012©
Get Started with Pre-engineered Hybrid Storage Systems
You don’t have to start from scratch.
Air Cooled Hybrid Cooling with pre-selected
equipment combinations:
• A/C Chillers
• IceBank™ Tanks and Plate Frame HX’s
• Factory Assembled Smart Pumping Skid
• Pre-packaged controls
• Dashboards that document savings
Saves time and MONEY
• Design and Installation phase
• Commissioning phase
• Operation & Maintenance phase

15. CALMAC Mfg.
Corp.2012©
Jefferson County Community College StagingJefferson County Community College Running

16. Questions?
Thank You!
IceBank Energy Storage
Terry Andrews
CALMAC Mfg. Corp.
(714)585-6121
tandrews@calmac.com