In this biography
Quick facts
- Born
- 11 November 1859
- Died
- 16 July 1938
- Birthplace
- London, England
- Country
- United States
- Nationality
- Not independently established
- Known for
- Chicago central-station development, electricity pricing and regional utility finance
- Known for
- Chicago central-station development, electricity pricing and regional utility finance
- Life
- 1859–1938
Why this life matters
Chicago central-station development, electricity pricing and regional utility finance.
Timeline
Key moments
Edison secretary
Moved to the United States to work for Thomas Edison.
Chicago Edison
Became president of the Chicago electricity business.
Purdue address
Explained central-station economics to electrical engineering students.
Combination
Chicago Edison and Commonwealth Electric became Commonwealth Edison.
Clerical skills opened an electrical-business career
Samuel Insull was born in London on 11 November 1859. He learned stenography and worked for George Gouraud, Thomas Edison’s London agent, before moving to the United States in 1881 as Edison’s private secretary. Loyola University Chicago’s finding aid records his subsequent responsibility for Edison manufacturing concerns and the establishment of the Schenectady works. The early career joined office skills with the organisation of a developing industry. Insull entered electrical business through administration and production rather than by first qualifying as a research scientist or inventing a generating machine.
Chicago shifted his attention from manufacture to supply
In 1892 Insull left the manufacturing side of the industry and became president of Chicago Edison. His business strategy encouraged a wider market for electric service through changes in prices, promotion, equipment and organisation. Technical development involved other engineers. The IEEE historical account, for example, connects Louis Ferguson’s investigation of generating equipment with the adoption and improvement of large steam turbines. This collaboration placed commercial decisions alongside engineering evaluation. The resulting station was useful only if equipment, distribution and customers could be brought together at a workable cost.
Load factor connected engineering to a pricing argument
In a 1898 address to Purdue’s electrical engineering department, published that June, Insull explained why a central station’s pattern of use mattered. Capacity had to accommodate maximum demand, while revenue came from electricity used over time. A customer’s annual consumption alone therefore did not describe every cost associated with serving that customer. His discussion of load factor made that relationship explicit. It remains a historical managerial argument with testable quantities, not a complete present-day tariff prescription or proof that every commercial decision in his later career was justified.
Sources for this section: [4]
Expansion and financial collapse require separate assessment
Chicago Edison and Commonwealth Electric combined as Commonwealth Edison in 1907. Insull’s interests subsequently extended into regional networks and holding companies. The business structure eventually collapsed during the Depression, and he faced criminal proceedings after his return from Europe. Loyola’s chronology records acquittals in federal trials in 1934 and 1935; accusation should not be rewritten as conviction. He died in Paris on 16 July 1938. His papers preserve substantial material on those later proceedings. The record supports studying both the operational economics he advanced and the distinct financial arrangements that later failed.
Quick answers
Frequently asked questions about Samuel Insull
- Do two customers using equal kilowatt-hours necessarily create the same maximum demand?
- No. Ten kilowatts for four hours and five kilowatts for eight hours both use forty kilowatt-hours, but their individual peak demands differ.
Keep exploring
Lives connected to this story
- Coleman Sellers II
Compare central-station demand with Niagara’s distinct problem of conversion and power transmission.
Sources and further reading
Explore the evidence
These references support the biography and offer further reading. Official records, first-person accounts and independent reporting provide different perspectives; image records document attribution and licensing.
- 1. Harold L. Platt, Encyclopedia of Chicago, Chicago History Museum and Newberry LibrarySamuel Insull: Electric Magnate
The article is an inspected 1898 primary text. Its historical tariff argument is distinguished from modern advice and from the later holding-company collapse.
- 2. Loyola University Chicago ArchivesSamuel Insull Papers: selected biographical notes and scope
- 3. IEEE Engineering and Technology History WikiHistory of IEEE: central-station technical development
- 4. Samuel Insull, Scientific American Supplement No. 1178; Project Gutenberg transcriptionThe Development of the Central Station, 25 June 1898