In the early 20th century, water was one of the primary sources for generating electricity in Connecticut, due to the increasing use of the Housatonic River as a power source. When CL&P was organized, the Bulls Bridge plant in New Milford was already in operation, its 6,000-kilowatt capacity comprising about a quarter of the total CL&P system capacity. Built in 1903, Bulls Bridge was the first large hydroelectric plant on the river and one of the first in the United States. It was also among the first to transmit electricity at a high voltage (33,500 volts) for any great distance. The line, completed in 1904, ran 26 miles to Waterbury. It was considered a pioneering development and attracted the attention of electrical engineers from all over the United States.
Building Bulls Bridge
After CL&P was formed, the development of the statewide electric power grid took shape with the consolidation of many local electric companies, the construction of large central generating stations, and the extensions of transmission lines to carry the power from the plants. Obsolete and inefficient units were dismantled and replaced with new, large power houses, transmission lines, and substations. Distribution systems in many cities and towns across Connecticut were rebuilt.
In 1917, CL&P had 43,436 customers and annual electric sales of 143,000,000 kilowatt-hours. By 1937, CL&P had approximately 2,300 employees, 160,790 customers, and electric sales of 646,000,000 kilowatt-hours, producing $15,200,000 in revenues. The electrification of Connecticut was occurring at a rapid pace in all segments of society - industrial, commercial, municipal, residential, and farm.
The efficiencies of the larger CL&P system brought lower electric rates to areas formerly served by smaller electric companies. In 1926, for example, CL&P acquired the electric companies serving Meriden, Woodbury, Westport, New Milford, and some neighboring towns. The charge for 100 kilowatt-hours in Meriden before the merger was $9; after the merger, it was $5.80 - an immediate reduction of 35 percent. Other small-town companies' charges for that amount ranged up to $15.
CL&P as it exists today is made up of more than 60 former operating companies. CL&P’s growth is reflected in the career of Richard F. Gretsch, who retired from the company in 1973 as a division manager.

CL&P office, Norwalk, CT, 1928
Gretsch began his utility career as a cadet engineer for Brooklyn Edison Company in New York in 1930. After World War II, he joined The Danbury and Bethel Gas and Electric Light Company and was elected president in 1948.
At that time, the company served Danbury, Bethel, Brookfield, and Newtown. In 1944, it was purchased by the Derby Gas & Electric Company, but continued to operate as a separate entity. Then, in 1953, it was consolidated with The Derby Gas and Electric Company and the Wallingford Gas Light Company to form The Housatonic Public Service Company. Gretsch was elected executive vice president of the enlarged Housatonic Public Service Company (HPS).
HPS grew as further consolidation occurred. In 1961, it was merged into CL&P and Gretsch became the Housatonic Division manager in charge of the company's activities from New Milford to Derby - a territory far larger than he had managed as head of Danbury and Bethel Gas and Electric Light Company.