A quick review ofPG&E’s E-20S Rate

IceBank Energy Storage

Terry AndrewsCALMAC Manufacturing Corp.tandrews@calmac.com(714)585-6121

PG&E’S E-20S RATE:

WHY IT IS A FANTASTIC RATE FOR ENERGY STORAGE

Energy Storage for a Cooler Future ™

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 CollegeHayward, CA

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

CALMAC Mfg.Corp.2012©

Base Load

LightingFans

Pumps

Cooling

0

200

400

600

800

1000

1200

1400

1600

1800

2000

k

W

Max. Peak Demand – $18.53/kWMax. Demand - $14.71Effective Total Demand:

$32.24/kW

PG&E’s E-20S Rate – Effective Demand Charges

Almost $50,000 per monthIn demand (kW) charges!

CALMAC Mfg.Corp.2012©

Base Load

LightingFans

Pumps

0200400600800

100012001400160018002000

k

W

Charging Storage

600 kW Shed

PG&E’s E-20S Rate – Effective Demand Charges

Max. Peak Demand – $18.53/kWMax. Demand - $14.71Effective Total Demand:

$32.24/kW

Save!!!!$19,000/month

CALMAC Mfg.Corp.2012©

Summer “Blended” Costs – Day vs. Night26.3 cents (Peak) vs. 7.3 cents per kWh (Off-Peak)

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

CALMAC Mfg.Corp.2012©

Winter “Blended” Costs, Day vs. Night15 cents (Peak) verses 7.4 cents per kWh (Off-Peak)

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

CALMAC Mfg.Corp.2012©

Project Examples

Edwards AFBCA

Encinitas Civic CenterEncinitas, CA

Nordstrom Dept. StoreHawaii

Los PositasLivermore, CA

CALMAC Mfg.Corp.2012©

Project Examples

Irvine Presbyterian ChurchIrvine, CA

Los Angeles Community College,Los Angeles, CA

Chabot College Hayward ,CA

California State Lottery Sacramento, CA

CALMAC Mfg.Corp.2012©

College Campus

University of ArizonaTucson, AZ

Production22 Chillers – 34,350 tons205 CALMAC IceBank™ tanks at two sites

30,750 ton hours of storage

Distribution7 miles of underground pipes5,500,000 gallons of water in the loop11 Pumps – 3255 HP (0.095 HP / ton of refrigeration)There are no pumps outside of the chiller plants62,260 gpm circulation capacity (1.8 gpm / ton)12 psi - total campus pressure drop16 degrees – average yearly temperature rise of the chilled waterLoads

176 buildings11,750,000 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)

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

CALMAC Mfg.Corp.2012©

Jefferson County Community College StagingJefferson County Community College Running

$ 84,000 REBATE!......IF IN CA

Questions?

Thank You!

IceBank Energy StorageTerry AndrewsCALMAC Mfg. Corp.(714)585-6121tandrews@calmac.com