Chugoku Electric Power Co., Inc. Hikimi Power Station Main

Chugoku Electric Power Hikimi Power Plant Main Building: A Western-Style Architectural Gem Hidden in the Mountains of Shimane

Deep in the rugged mountains of western Shimane Prefecture, where Japan's heaviest snowfalls blanket the valleys each winter, stands a surprising vision: a small, elegant building that looks almost like a country chapel. In fact, this is no chapel at all, but the Hikimi Power Plant Main Building of the Chugoku Electric Power Company, a hydroelectric station that has been generating electricity continuously since 1928. Officially registered as a Tangible Cultural Property of Japan in 2015, this quietly beautiful building invites travelers to reflect on how modernity, industry, and architectural ambition once reached even into Japan's remotest valleys.

Historical Background

In the early twentieth century, Japan was racing to electrify its cities and industries, and engineers were searching every corner of the archipelago for rivers steep enough and abundant enough to turn turbines. The Hikimi River, a tributary of the Takatsu River system, was a prime candidate. Fed by the high ranges along the border between Shimane and Hiroshima Prefectures and swollen by some of the heaviest snowfall in western Japan, it carried both volume and velocity in generous measure.

The Izumo Electric Company (Izumo Denki), a regional utility that would eventually be absorbed into today's Chugoku Electric Power, began developing the Hikimi River for hydroelectric generation in the 1920s. The Hikimi Power Plant began operation in July 1928 (Showa 3), with an initial output of 2,000 kilowatts. Just two months later, in September of the same year, the company completed the larger Toyokawa Power Plant further downstream. A third plant, Sumikawa, followed in 1943. Together, these three stations — all still in operation today — trace a remarkable century of continuous power generation in one of Japan's most mountainous and snow-bound regions.

Of the three, the Hikimi Power Plant lies farthest upstream. At the time of its construction, the idea of bringing substantial hydroelectric capacity to this remote corner of Iwami — the old name for this part of Shimane — was an ambitious undertaking, and the resulting architecture reflects the civic pride and optimism of the age.

Why It Was Designated a Cultural Property

On March 26, 2015, the Hikimi Power Plant Main Building was officially added to Japan's register of Tangible Cultural Properties (Toroku Yukei Bunkazai) for buildings. The registration honors the structure on several grounds: its contribution to the historical landscape of the nation, the skill and restraint of its design, and the difficulty of reproducing such a building today. The same registration was granted simultaneously to the Toyokawa Power Plant Main Building, recognizing the two sister structures as paired landmarks of the Hikimi River valley.

What makes the building historically valuable is not merely its age, but the ambition behind it. At a time when most utilitarian industrial structures in rural Japan were plain timber sheds, the architects of the Hikimi Power Plant designed a permanent, fire-resistant concrete-block building and chose to dress it in the refined vocabulary of Western architecture. The result is regarded as a leading example of early twentieth-century industrial heritage in the Iwami mountain region and a rare surviving witness to the modernization of rural Japan.

Highlights and Architectural Features

The Main Building is a single-storey structure with a partial second storey, built of large concrete blocks and roofed with steel sheeting. Its footprint is modest — just under 200 square metres — yet its silhouette is memorable, with a tall generator hall forming the main volume and a two-storey office wing attached to one side.

The exterior is where the building truly charms. Shallow pilasters articulate the walls, dividing them into bays. Within each bay, rectangular window openings are stacked in two tiers, crowned at the top by a subtle segmental arch niche. The overall effect is crisp and rhythmical, bringing to mind the proportions of a small European chapel set incongruously among Japanese cedar forests. Local literature often describes the building's appearance as reminiscent of a small country church.

This deliberate borrowing of Western ecclesiastical and civic design vocabulary was characteristic of early Showa-era public works in Japan. By investing a remote industrial facility with such careful detailing, the builders were making a quiet statement about the dignity of modern infrastructure and the cultural aspirations of the young utility industry.

Continued Operation

Nearly a century after it was commissioned, the Hikimi Power Plant is still producing electricity — a working monument rather than a static relic. The flow-type (run-of-river) system it employs takes water from a weir upstream, channels it along a gently graded conduit, and releases it through a penstock to the turbines below, exploiting the natural drop in elevation rather than damming the valley. This was the dominant design philosophy for Japanese mountain hydroelectricity in the 1920s, and the Hikimi plant is one of the country's most elegant surviving examples.

Visitor Information

Please note that the Hikimi Power Plant is an active, operating facility owned and managed by Chugoku Electric Power Company. The interior is not open to the public, and visitors are asked to appreciate the Main Building from public roads and viewpoints outside the plant's grounds. Photography from public areas is generally welcomed, and the approach along the Hikimi River makes for a beautiful drive in any season.

The plant lies in the Hikimi district of Masuda City, reached by driving east from central Masuda along National Route 488 and its connecting roads. Public transport into the upper Hikimi valley is limited, so a rental car is strongly recommended for international travelers. The route passes through forests, terraced fields, and small mountain hamlets, and the building comes into view suddenly beside the river — a scene worth pausing for.

Winter visits require caution, as Hikimi is one of the snowiest parts of Japan west of Honshu. Spring through autumn is the most comfortable season, with fresh greenery in May and vivid foliage from late October through mid-November.

Surrounding Attractions

The Hikimi area is famed above all for Hikimi Gorge (Hikimi-kyo), a designated part of the Nishi-Chugoku Sanchi Quasi-National Park. The gorge is traditionally divided into four sections — Mae-Hikimi, Oku-Hikimi, Omote-Hikimi, and Ura-Hikimi — each offering a different character of scenery. Omote-Hikimi is a gentle four-kilometre stretch of translucent river accessible by car, while the more dramatic Ura-Hikimi is a steep-walled ravine best explored on foot, rewarding hikers with views of the Godan-no-taki (Five-Tier Waterfall) and the gorge's deepest pool. In Oku-Hikimi, the 53-metre Dairyuzu Waterfall is the reward at the end of a modest trail through a rhododendron grove.

After a day of exploring, many visitors head for Hikimi-kyo Onsen "Yasuragi no Yu," a hot spring bathhouse fed by two natural sources. The waters are gently radioactive and renowned locally as a "bijin no yu," or beauty bath, with effects reputed to benefit muscle ache, chills, and circulation. Outdoor baths, cypress-wood tubs, and a sauna offer a welcome pause after hiking.

Further afield, the central area of Masuda City preserves important cultural heritage of its own, including the temples and gardens associated with the medieval painter Sesshu, and the coastline of the Sea of Japan offers seafood, sunsets, and quiet beaches to round out a visit to this overlooked corner of Shimane.