Alberta commission takes comment on 3.3-MW cogen planned by ENMAX

The Alberta Utilities Commission will be taking comment until Feb. 19 on a recent application from ENMAX Generation Portfolio Inc. for approval to construct and operate a natural gas-fired combined heat and power cogeneration system at the ENMAX Downtown District Energy Centre, located at 435 Ninth Ave. S.E., Calgary.

This cogen system would consist of one 3.3-MW natural gas-fired generator and associated heat recovery equipment, and would be housed in the existing Downtown District Energy Centre building. The power plant is intended to supply power to the Downtown District Energy Centre and to export surplus power to the ENMAX Power Corp. 25-kV distribution system.

ENMAX Generation Portfolio (EGPI) applied on Jan. 13 with the commission for this project. EGPI is a subsidiary of ENMAX Energy Corp., which is a wholly-owned subsidiary of ENMAX Corp.

The Downtown District Energy Centre (DDEC) is a facility owned by ENMAX Corp. that provides district energy to downtown Calgary commercial and residential buildings. Hot water is produced in boilers at the DDEC and circulated through pipes to various heating loads in the downtown area. The DDEC was completed in 2010 and consists of 55 MWt of thermal boilers, pumps and a connection to the thermal distribution system that provides heat to up to 6 million square feet of floor space in the Downtown Calgary, East Village and Victoria Park districts.

The DDEC was initially designed to host a combined heat and power (CHP) unit, however at the time of its completion the facility was underutilized relative to its capacity and the installation of a CHP was deferred. Over the years there has been steady demand growth and an additional boiler has been added, bringing capacity to 55 MWt. The facility will be fully subscribed by 2018.

Under this project, a 3.3-MW natural gas-fueled CHP generator will replace the existing 750-kW diesel-fueled standby generator currently in service at the DDEC. The CHP unit will generate electricity both for the DDEC’s internal operation and the surplus will be exported into the distribution system for use by nearby loads. Waste heat will be recovered from the exhaust and cooling loops of the CHP and sold to the DDEC to offset its own fuel use (3.05 MWt).

A project contact is: Grant Weismiller, Vice President, Regulatory Applications, (403) 514-3105,

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.