---
title: "Choshi Offshore Demonstration"
source: https://hafrok.com/projects/jp-choshi-offshore-demonstration/
identifier: jp-choshi-offshore-demonstration
updated: 2026-10-13
---

# Choshi Offshore Demonstration

Source: https://hafrok.com/projects/jp-choshi-offshore-demonstration/  
Data as of: 2026-10-13

Located 3km off Choshi, Chiba Prefecture. Also includes a met mast.

| Field | Value |
|---|---|
| Country | Japan |
| Sea basin | Northwest Pacific |
| Capacity | 2.4 MW |
| Turbines | 1 |
| Lifecycle stage | Operational |
| Owners | TEPCO · NEDO |
| Coordinates | 35.681, 140.821 |
| Commercial operation (announced) | 2019-01-01 |

## Milestones

- **Final investment decision** — 2010-05-19 (achieved)
- **Offshore construction** — 2010-12 (achieved)
- **First power** — 2013-03 (achieved)
- **Commercial operation** — 2019-01-01 (achieved)

## Offtake

Offtake regime: Japan FIT (NEDO demo -> commercial FIT from Jan 2019)


## Sources

Every figure above traces to one of these. Quoted passages are held but not republished; follow the link for the original wording.

- unknown, date not stated — https://www.4coffshore.com/windfarms/choshi-offshore-demonstration-project-japan-jp03.html
- GEBCO Compilation Group, 2020 — https://www.gebco.net/data_and_products/gridded_bathymetry_data/
- TEPCO, 2019 — https://www.tepco.co.jp/en/rp/ourbusiness/wind/choshi.html
- 4C Offshore, 2018 — https://www.4coffshore.com/news/tepco-launches-first-commercial-offshore-wind-farm-nid9934.html
- The Wind Power, 2026 — https://www.thewindpower.net/windfarm_en_18505_choshi-offshore.php
- Kajima Corporation, 2013-02-27 — https://www.kajima.co.jp/news/press/201302/27c1-j.htm
- offshoreWIND.biz, 2013-03-04 — https://www.offshorewind.biz/2013/03/04/2-4-mw-turbine-produces-first-power-off-choshi-japan/
- offshoreWIND.biz, 2019-01-09 — https://www.offshorewind.biz/2019/01/09/tepco-ponders-1gw-offshore-wind-farm-japan/
- Japan for Sustainability, 2010-05-19 — https://www.japanfs.org/en/news/archives/news_id030136.html
- DTU Wind Energy / World Bank (Global Wind Atlas), 2026 — https://globalwindatlas.info/
- NEDO, 2013 — https://www.nedo.go.jp/content/100534312.pdf
- Mitsubishi Heavy Industries Technical Review, 2011-09 — https://www.mhi.com/technology/review/sites/g/files/jwhtju2326/files/tr/pdf/e483/e483042.pdf

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Hafrok · https://hafrok.com/projects/jp-choshi-offshore-demonstration/ · please cite the page you took a figure from.