Dashboard

Now you are in the subtree of Lecture Notes public knowledge tree. 

[TECH] Electric Power Grid

The Electric Power Grid is the system of generation, transmission, and distribution of electrical energy, pioneered by Edison (DC, 1882), Tesla and Westinghouse (AC, 1890s), and now the foundational infrastructure of modern civilisation.

Overview

Thomas Edison's Pearl Street Station (1882, New York) was the first commercial power grid, using DC. Nikola Tesla's polyphase AC system (1888) and the Westinghouse AC grid at Niagara Falls (1895) proved AC's superiority for long-distance transmission (the "War of Currents"). By 1920 most of the developed world had electrical power.

The grid enables all modern manufacturing, computing, communications, and transportation. The International Energy Agency estimates that electricity is now the energy carrier for ~25% of global final energy consumption, with that share rising rapidly.

Key Actors

  • Companies: Edison Electric (now GE, 1892), Westinghouse Electric (1886), Siemens (1847), ABB (1988)
  • Inventors: Thomas Edison (1847–1931), Nikola Tesla (1856–1943), George Westinghouse (1846–1914)

Key Patents

  • Tesla, N. US Patent 381,968 (1888) — AC electric motor
  • Edison, T.A. US Patent 223,898 (1880) — incandescent lamp

Economic Value

Global electricity generation revenue: USD 3.5 trillion/year (IEA 2023). Industries enabled by electric power represent ~70% of global GDP (~USD 70T). Electric motors alone drive 45% of global electricity consumption, enabling manufacturing worth >USD 15T/year.

Notes

IEA World Energy Outlook 2023 for generation figures. McKinsey The Future of Electricity (2018) for enabled GDP estimate.

What This Enables

  • [TECH] Vacuum Tube Electronics — Mains AC power enables stationary vacuum tube equipment (radio transmitters, early computers) without batteries.
  • [TECH] Digital Computing — Large-scale computing requires megawatts of reliable electrical power.

Discovery Character

Surprise level: High — Widespread electric power transformed domestic life, manufacturing, and eventually computing in ways that exceeded all forecasts. Edison himself said the central station would make "light so cheap that only the rich will burn candles."

Mode: Edisonian (Edison) / Systematic-theoretical (Tesla). Edison's lab explicitly practised trial-and-error at scale: thousands of filament materials were tested for the lightbulb. Tesla's rotating magnetic field and polyphase AC system were theoretical insights (he visualised the rotating magnetic field in a flash while reciting Goethe). The eventual triumph of AC over DC (the "War of Currents") was settled by physics, not market forces alone.