Folsom Powerhouse State Historic Park
🏆 Official Guide: Folsom Powerhouse State Historic Park — One of America’s earliest and best-preserved AC hydroelectric power stations in California — built in 1895, it transmitted electricity 22 miles to Sacramento and is now a National Historic Landmark with original generators, turbines, and Tennessee-marble switchboard intact.
Folsom Powerhouse State Historic Park preserves a pioneering achievement in American engineering — one of the earliest and most complete alternating current (AC) hydroelectric power stations in the United States. Built on the banks of the American River in Folsom, California, the powerhouse began operations on July 13, 1895, and successfully transmitted electricity 22 miles to Sacramento — proving that long-distance AC power transmission was viable. The facility served Sacramento’s electrical needs for over 50 years.
Visitor Information
| Detail | Information |
|---|---|
| Location | 9980 Greenback Lane, Folsom, CA 95630 |
| Built | 1895 — operational for 50+ years |
| Admission | Free (nominal parking fee) |
| Hours | Wed–Sun, typically noon–4/5 PM (check current hours) |
| Tours | Guided docent tours available |
Designations
| Designation | Significance |
|---|---|
| National Historic Landmark | Nationally significant engineering achievement |
| National Historic Civil Engineering Landmark | Pioneering AC transmission infrastructure |
| National Historic Mechanical Engineering Landmark | Original turbine and generator technology |
What to See
| Feature | Details |
|---|---|
| Original Generators | Vintage 1895 generators — preserved in operating position |
| Turbines | Water-powered turbines from original installation |
| Switchboard | Tennessee-marble control panel — remarkably intact |
| Building | Original brick-and-granite powerhouse — looks like 1895 |
| Visitor Center | Educational exhibits on hydroelectric power history |
Activities
| Activity | Details |
|---|---|
| Guided Tours | Docent-led tours of powerhouse machinery and history |
| Museum | Visitor center with hydroelectric power exhibits |
| History | Pioneer AC power — changed American infrastructure |
| Photography | Scenic American River setting, historic architecture |
| Nature | Trails along American River / Lake Natoma views |
Frequently Asked Questions
Why is the Folsom Powerhouse historically important?
The Folsom Powerhouse was one of the first hydroelectric plants in the world to successfully demonstrate long-distance AC power transmission. When it began operating in 1895, it transmitted electricity 22 miles to Sacramento — proving that Nikola Tesla’s AC system could power cities from remote water sources. This achievement helped win the “War of the Currents” against Thomas Edison’s DC system and shaped the modern electrical grid.
Is there a fee to visit?
Admission to the powerhouse and visitor center is free. There may be a nominal parking fee. Guided tours led by volunteer docents are also free. Group and school tours can be arranged in advance through the California State Parks website.
Can I see the original machinery?
Yes — the powerhouse has been meticulously preserved to look as it did in 1895. The original generators, turbines, and Tennessee-marble switchboard are all on display in their original positions. It’s one of the most complete and well-preserved early hydroelectric facilities in the United States.
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