Electric light by the first practical electric arc light in 1806. By the 1870s, Davy's arc lamp had been successfully commercialized, and was used to light many public spaces. The development of a steadily glowing filament suitable for interior lighting took longer, but by the early twentieth century inventors had successfully developed options, replacing the arc light with incandescents. The energy efficiency of electric lighting has increased radically since the first demonstration of arc lamps and the incandescent light bulb of the 19th century. Modern electric light sources come in a profusion of types and sizes adapted to many applications. Most modern
Hartford Electric Light Company for producing heat and steam for their customers. The steam company introduced a new technology in 1881, an electric generator. It was Hartford's first electric service. The Hartford Electric Light Company (HELCO) in 1881 received its charter as an official company and took over the electrical part of Hartford Steam Company. At that time Hartford had about a thousand gaslights in 80 miles of the city streets. It began actual operations of the steam-powered electrical generating plant on Pearl Street in 1882. Austin Cornelius Dunham was the company's first president. The first major project the company did was electrical lighting