CWNGCanadian Western Natural Gas (Canada)
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Interest in the use of expanders in regulating stations in Canada was initiated in 1985 when Canadian Western Natural Gas (CWNG), now ATCO, sponsored a review of their distribution system to evaluate the energy production potential.
However, a more detailed study of the CWNG distribution system showed the potential for energy recovery.
Prototype units were installed at CWNG in Calgary, with Consumers Gas in Ontario and with British Gas in Manchester, England.