A small town with a massive spark in electrical history

History · Published 20 October 2026 · Updated 21 October 2026 Swipe more like this →

In short: In 1886, a resident of Great Barrington, Massachusetts, achieved a global first that fundamentally changed how we power our world. By successfully demonstrating the first practical alternating current system with transformers, he paved the way for the modern electrical grid we rely on today.

While Great Barrington is known today as a scenic resort community and an Appalachian Trail hub, its historical significance includes a major leap in industrial physics. In November 1885, electrical engineer William Stanley, Jr., working for George Westinghouse, began installing a demonstration system to prove that alternating current (AC) was superior to Thomas Edison's direct current (DC). Stanley believed that his development of a series transformer was the key to making AC practical for wide-scale use. The town was originally known as Mahaiwe by the Mahican Indians. It served as a waypoint on the New England Path. In 1724, Captain John Ashley purchased much of the land for £460.

The breakthrough occurred in March 1886. Operating out of an "Old Rubber Factory" south of Cottage Street, Stanley used a Westinghouse steam engine to power a 500-volt Siemens generator. He strung power lines between trees and successfully lit 23 businesses along Main Street. Such a setup represented the initial functional display of transformer-based AC, enabling high voltage (500 volts) to be reduced into 100 volts for light bulbs while maintaining low energy waste across 4,000 feet. This setup allowed the system to power incandescent lamps at each location. The demonstration proved that AC could be distributed with very little power loss. It was a pivotal moment in electrical engineering history.

This local experiment provided the technical foundation for the AC systems that Westinghouse would begin installing across the country later that same year. Beyond its electrical legacy, the town's history is layered with complex narratives, from its origins as "Mahaiwe" (the place downstream) to its role in King Philip's War and its development as a Gilded Age retreat for wealthy families seeking relief from urban pollution. The area also served as a transit point for Henry Knox during the siege of Boston in 1776. In 2009, it was officially recognized as an Appalachian Trail Community.

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