As more people became connected to the electric grid, Insull's company, which had an exclusive franchise from the city, grew steadily. By 1920, when it used more than two million tons of coal annually, the company's 6,000 employees served about 500,000 customers. Annual revenues reached nearly $40 million. During the 1920s, its largest generating stations included one on Fisk Street and West 22nd and one on Crawford Avenue and the Sanitary Canal.
