Pearl Street Station (1882): Edison's First Central Power Plant

Pearl Street Station, which began supplying electricity on 4 September 1882 in Lower Manhattan, was the first commercial central power station in the United States. Built by Thomas Edison’s Edison Electric Illuminating Company of New York, it sent direct current through underground cables to homes and offices in the financial district. It proved that electricity could be generated in one place and sold to many customers, the model on which every later power utility was built.

Background: a system, not just a lamp

After his team’s success with the carbon-filament lamp in 1879, Edison knew that lamps alone were not enough. Customers needed a reliable supply of electricity, just as they received gas from gasworks through pipes. Edison set out to build a complete system: dynamos to generate current, underground conductors to carry it, and fuses, switches and meters to deliver and measure it safely.

He chose a “First District” of roughly one square mile in Lower Manhattan, around Wall Street, because it was dense with offices and wealthy customers, including the banking house of Drexel, Morgan and Company, whose partners had invested in his company. Canvassers surveyed the district building by building to see how many gas lights each used.

Building the station

Edison bought two buildings at 255 and 257 Pearl Street in 1881. Inside, coal-fired boilers produced steam for high-speed engines driving large “Jumbo” dynamos, named after P. T. Barnum’s famous elephant. Each weighed around 27 short tons (about 24 tonnes) and could power roughly 1,200 lamps.

Laying the cables took months. Workers dug trenches along the streets and laid copper conductors inside iron pipes, insulated with a mixture of asphalt, paraffin and linseed oil. Edison often supervised the work himself.

Opening day

At about 3 p.m. on 4 September 1882, current flowed from Pearl Street into the district. Edison was at the Drexel, Morgan offices at 23 Wall Street, and the lamps there lit up as planned. The New York Times, whose offices were among the first customers, reported that the light was soft and steady, and compared it favourably with gas.

On the first day the station served a few dozen customers with several hundred lamps, and more buildings were connected in the following months. Electricity was supplied free at first, and regular billing began in 1883. Edison used electrolytic meters, in which current deposited zinc on plates that were weighed to calculate charges.

Operation and limits

The station supplied direct current at about 110 volts. Direct current could not be sent far without heavy losses, so the system could only cover customers within roughly a mile of the station. By 1884 Pearl Street served more than 500 customers with over 10,000 lamps. The station is also often said to have supplied waste steam to heat nearby buildings, an early example of combined heat and power.

The short range of direct current became a serious weakness as cities grew. Rivals backed alternating current, which could be stepped up to high voltages with transformers and sent over long distances. This conflict became the War of the Currents, which alternating current eventually won.

On 2 January 1890 a fire badly damaged the station. It was repaired, but larger stations replaced it, and it was closed in the mid-1890s. The building was later demolished.

Pearl Street and its rivals

Pearl Street was not the only early experiment in public electricity supply. In 1881 the small English town of Godalming in Surrey began lighting streets and some buildings with electricity from a water wheel on the River Wey, though the scheme was short-lived. In January 1882 Edison’s own company opened a coal-fired station at Holborn Viaduct in London, run by his associate Edward H. Johnson, to supply lamps along the viaduct and nearby buildings. On 30 September 1882, less than a month after Pearl Street, a hydroelectric plant on the Fox River at Appleton, Wisconsin, began lighting a paper mill and a house using Edison equipment.

In the early 1880s Edison’s companies actually sold more “isolated plants” than central stations: self-contained generators installed in a single factory, hotel, ship or mansion. J. P. Morgan’s own house in New York had one. Pearl Street mattered because it showed that a company could build one large plant, run wires under public streets and sell power to many separate customers at a profit. Within a few years Edison companies were building similar central stations in other American cities, and the idea spread to Europe.

Timeline

• 1879, 22 October: Edison’s team tests its long-lasting carbon-filament lamp.
• 1880, December: The Edison Electric Illuminating Company of New York is organised.
• 1881: Edison acquires 255-257 Pearl Street and begins laying cables.
• 1882, January: Edison’s Holborn Viaduct station in London begins operating.
• 1882, 4 September: Pearl Street Station starts supplying the First District.
• 1883: Customers begin paying for their electricity.
• 1890, 2 January: A fire damages the station.

Why it matters

Pearl Street Station turned electricity into a public service. Its combination of central generation, underground distribution and metered billing became the blueprint for power utilities worldwide. The company that ran it grew into Consolidated Edison, which still supplies New York City.