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July 4, 2001
Deep Lake Water Cooling project heats up
  
Works and Emergency Services -- An innovative project using water from deep in
Lake Ontario to cool downtown buildings is one step closer to implementation.
The City of Toronto Works Committee today endorsed staff recommendations to
execute an Energy Transfer Agreement with Enwave District Energy Limited.

The Deep Lake Water Cooling (DLWC) project involves building a new intake for
the Island Filtration Plant, upgrades to the Island Filtration Plant and the
John Street Pumping Station, and construction of a heat exchange facility with
all costs borne by Enwave. It is expected to be operational by 2003.

"This is an excellent example of a public/private sector partnership delivering
improved services to Toronto residents and business," said Works Committee
Chair, Councillor Betty Disero. "The Deep Lake Water Cooling (DLWC) project
provides a reliable source for cooling, long-term predictable costs and minimal
impact on the environment compared with traditional methods of air
conditioning."

"With each additional bad air day, it is becoming imperative that we take all
necessary measures to improve the air we breathe," said Dennis Fotinos,
president and CEO of Enwave.

The DLWC project will produce significant environmental and economic benefits.
Using deep lake water as a cooling source will reduce the demand for
electricity and enable removal of ozone depleting refrigerants from existing
building cooling systems. Based on the estimate peak cooling capacity of 40,000
tonnes, carbon dioxide emissions will be reduced by approximately 30,000 tonnes
a year, along with reduction in nitrous oxides, sulphur dioxide and fine
particle emissions. There will also be economic benefits to consumers to the
extent that district cooling using deep lake water is less costly than
conventional cooling using electric chillers. In addition, the City will
benefit from an improved raw water source that may result in reduced taste and
odour occurrences during warm weather.

Deep lake water cooling entails the year-round supply of water at 4 degrees
Celsius from an 85-metre depth in Lake Ontario through a new intake constructed
for the Island Filtration Plant. Following treatment at the Island Plant, the
potable water would be transmitted to the John Street Pumping Station, diverted
through an energy transfer loop to heat exchangers and then fed back to
discharge mains at a temperature of approximately 13.3 degrees Celsius. The
chilled water will then be distributed through Enwave's district cooling
network to consumers in the downtown core.

Enwave District Energy Limited is the second largest district energy company in
North America providing district heating and cooling to more than 115 customers
in Toronto's downtown core since 1982.

The Deep Lake Water Cooling report will be considered by Toronto City Council
at its meeting of July 24.


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