A julianboyle

Alderney 5 Energy Project World s First Geothermal (UTES) Cold Energy Storage System 2 years of operating history Julian Boyle, P.Eng. Manager of Strategic Energy Policy and Initiatives boylej@halifax.ca

Peel Energy Matters Summit May 27, 2012

Julian Boyle, P.Eng. boylej@halifax.ca

Alderney 5 Energy Project 1.

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Total Area = 330,000 ft2 2004 Energy Costs

Electricity $406,000 Oil $155,000 (@ $0.38/litre)

2007 Energy Costs $730,000 2011 BAU Energy Costs

$900,000

Alderney Landing Theatre Alderney Gate Office Alderney Library Dartmouth Ferry Terminal Dartmouth City Hall

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There were 5 Elements of Project ($2.7M, with $1M from Feds): #1 #2 #3 #4 #5

Lighting Retrofit District Energy - Heating and Cooling Piping New High Efficiency Gas Boilers Seawater Cooling System World’s first Geothermal Cold Energy Storage System (UTES) 2,000 Tonnes of CO2e reductions

Total Savings $400,000/year ($250,000 was original prediction)

$850,000 in Avoided capital ROI: 14.9%

Halifax Waterfront and Bathymetry BIO BIO

Alderney 5 Purdy s Wharf, etc

Emera

Purdy s Wharf & Casino & Historic Properties & New RBC Waterside

Emera

HALIFAX HARBOUR TEMPERATURES (temperature vs depth and month) 18 16

Sea level 5m deep

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Water temperature (C)

15m deep 25m deep

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Approx temp needed for direct cooling

8 6 4

Storage (UTES) uses available cold energy in winter and stores for peak summer use

2 0 Jan

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Seawater Harbour Temperature at Alderney intakes Summer 2010

Temperature

Summer 2011

Alderney 5 Energy Project: World s First Geothermal Cold Storage System How it works‌(play 2 minute animation)

Actual 3D Ground Temperatures

@ 425 dept

Cold Charging Approx. 1째C drop per month

@ 215 depth

@ 50 depth

Oct 5 2011 Feb 23 2011

May 2 2011

There is over 30 km of geothermal piping within borefield at Alderney

Seawater intakes and filtration manufactured locally by Connors Diving, September 2009

Alderney 5 Energy Project: 1 minute time lapse of construction‌

Thank You! Questions?

More info at‌ www.halifax.ca/facilities/Alderney5.html