The Timber Powerhouse of the Gami Plant
The Gami Power Plant Main Building (賀美発電所本館, Gami hatsudensho honkan) is the powerhouse of a hydroelectric station built in 1919 in Kamifukaogi-cho, Hitachiota City, Ibaraki Prefecture, and was registered as a Registered Tangible Cultural Property (structure) on November 8, 2004. It is owned by the Tokyo Electric Generation Company, and the plant is still in operation.
The Agency for Cultural Affairs records it as a single-storey wooden building with a sheet-metal roof and a building area of 189 square metres; its registration number is 08-0140. According to the Agency, it was built on the middle reaches of the Sato River, part of the Kuji River system.
Why It Was Registered
The Gami Power Plant Main Building was registered as a building that contributes to the historic landscape of the country. The Agency for Cultural Affairs describes a single-storey timber building with a gabled roof of batten-seamed sheet metal and clapboard walls; a raised clerestory roof and wide openings in the walls show careful attention to ventilation.
The roof is carried on timber Pratt trusses, and the generator room houses a single set of horizontal-shaft turbine and generator (Agency for Cultural Affairs). The Tokyo Electric Generation Company notes how the wooden powerhouse, the penstock behind it and the tailrace in front sit in harmony with their natural setting.
What to Look For
Outside, look for the clerestory rising above the ridge of the gabled roof and the large windows in the clapboard walls. These are the ventilation features the Agency points out.
Behind the powerhouse a penstock runs down the hillside, and in front the outfall carries the water back to the Sato River (Tokyo Electric Generation Company). Notice how the facilities line up along the path of the water.
Visiting the Gami Power Plant Main Building
The Gami Power Plant Main Building is a working power station and its interior is not open to the public. No official information on viewing points or parking could be confirmed. Do not enter the facility, and follow any posted guidance when viewing from outside. The Gami Power Plant page covers the station as a whole.
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Q&A
- When was the Gami Power Plant Main Building built?
- In 1919.
- When was it registered as a cultural property?
- It became a Registered Tangible Cultural Property on November 8, 2004.
- What does the powerhouse look like?
- A single-storey timber building with a gabled sheet-metal roof, clapboard walls, a ventilating clerestory and wide openings, roofed on timber Pratt trusses.
- What is inside the generator room?
- A single set of horizontal-shaft turbine and generator.
- Can you visit the Gami Power Plant Main Building?
- It is a working power station and the interior is not open; follow posted guidance when viewing from outside.
Basic Information
| Name | Gami Power Plant Main Building (賀美発電所本館) |
|---|---|
| Location | 320 Kamifukaogi-cho, Hitachiota City, Ibaraki Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered 2004/11/8 (Heisei 16) |
| Quantity | 1 building |
| Dimensions | Wooden, single storey, sheet-metal roof, building area 189 square metres |
| Owner | Tokyo Electric Generation Company |
| Public Access | Working power station (interior not open) |
References
- Gami Power Plant Main Building (Database of National Cultural Properties, Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00004310
- Cultural properties (Tokyo Electric Generation Company)
- https://tokyohatsuden.co.jp/csr/cultural_property/
- Sato River hydroelectric plants (JSCE Civil Engineering Heritage)
- https://committees.jsce.or.jp/heritage/node/956
Last verified: 2026.10.06
