T. C. Power and Bro was a prominent mercantile business started by Thomas Charles Power in Fort Benton, Montana.
Daniel Webster Marsh helped establish the firm in Canada. Marsh opened up a store in Fort Walsh, Saskatchewan in 1876. As the Canadian Pacific Railway moved west, Marsh saw the opportunity to open up new stores. He opened up their stores in Maple Creek, Saskatchewan in 1883 and Calgary, Alberta in 1884. From 1884 to 1893 he managed the store in Calgary, while is nephew, Horace A. Greeley managed the store in Maple Creek.