<P> As of 2008, Alberta's electricity sector was the most carbon - intensive of all Canadian provinces and territories, with total emissions of 55.9 million tonnes of CO equivalent in 2008, accounting for 47% of all Canadian emissions in the electricity and heat generation sector . </P> <P> Calgary Power's first major project became the construction of the province's first large - scale hydroelectric plant, located at the Horseshoe Falls . The Horseshoe Falls Plant's opening on May 21, 1911, allowed Calgary Power to meet the needs of the city . According to the Morning Albertan, Calgary mayor J.W. Mitchell was aroused from a Sunday nap to flip the switch which officially opened the plant and connected the city with its first large - scale source of electricity . In 1911, Calgary Power supplied 3,000 horsepower of electricity to the city at a cost of $30 per horsepower . The city had 44,000 people in 1911, and the emerging need for mass transportation was met by the booming streetcar industry, which accounted for a significant share of the city's electric usage . By 1913, Calgary Power had constructed the Kananaskis Falls Plant as an additional source of power . </P> <P> In 1947, two years after the war ended, Calgary Power moved its head office from Montreal--then the nation's largest city and prime business center--to Calgary, reorganized, and incorporated as Calgary Power Ltd . At that time, Calgary Power supplied the province of Alberta with 99 percent of its hydroelectric power . Also in 1947, Calgary Power built its Barrier Hydro Plant and used it to test the use of a newly developed remote - control operation system . The automation efforts worked well enough that Calgary Power soon converted all of its plants to the Barrier Plant system . A control center that could operate the company's entire system was built in Seebe in 1951 . </P> <P> Calgary Power continued to expand through the 1950s and 1960s, developing its first underground distribution lines and building dams on the Brazeau and North Saskatchewan rivers . The reservoir built on the North Saskatchewan project, Lake Abraham, became the largest man - made lake in the province . Also at this time, Calgary Power began exploring thermal energy generation, since few sites remained that were suitable for hydro power development . The company built its first thermal generating plant in 1956 near Wabamun Lake, west of Edmonton and near large coal reserves . </P>

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