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Two of Sunvillage's Own Energy Storage Facilities in TEPCO Area Enter Supply-Demand Adjustment Market

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Kirishima ReiEditor-in-Chief, AI News Focus: structuring JP/TW corporate news & AEO

Published Jul 4, 2026 1:00 AM ・ Updated Jul 7, 2026 5:27 AM ・ 6 min read ・ Source: PR TIMES

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Two of Sunvillage's Own Energy Storage Facilities in TEPCO Area Enter Supply-Demand Adjustment Market — Image: PR TIMES

⚡ Key Points

Sunvillage Co., Ltd.
announces that its two high-voltage grid-connected energy storage facilities in Ōta City, Gunma Prefecture, and Mishima City, Shizuoka Prefecture, have entered Japan's supply-demand adjustment market as of June 27, 2026, marking the company's first self-aggregation market operation within the TEPCO service area.

Sunvillage Co., Ltd. announces that its two high-voltage grid-connected energy storage facilities in Ōta City, Gunma Prefecture, and Mishima City, Shizuoka Prefecture, have entered Japan's supply-demand adjustment market as of June 27, 2026, marking the company's first self-aggregation market operation within the TEPCO service area.

PRIMARY SOURCE PR TIMES View source Distributor: PR TIMES
Published: Jul 4, 2026

Sunvillage Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; Representative Director: Choji Mihara; hereinafter "the Company") announces that its high-voltage grid-connected energy storage facilities constructed in Ōta City, Gunma Prefecture, and Mishima City, Shizuoka Prefecture, have entered the supply-demand adjustment market as of June 27, 2026.

These facilities mark the Company's first market operation using self-aggregation within the Tokyo Electric Power Company (TEPCO) service area, participating in the wholesale electricity market, supply-demand adjustment market, and capacity market. To date, the Company has successfully interconnected 42 grid-scale energy storage facilities nationwide: 25 in the Chubu Electric Power area, 15 in the TEPCO area, and 2 in the Tohoku Electric Power area. Moving forward, Sunvillage will gradually expand its self-aggregation framework and continue deploying market operations for its self-developed energy storage facilities.

Since its founding in 2012, the Company has operated under the philosophy of "harmony and collaboration with local communities," with a policy of realizing "safe and reliable power and energy storage facilities." As the expansion of renewable energy adoption makes grid stability and supply-demand balance increasingly critical societal challenges, Sunvillage is focusing on aggregation as a core business to enhance supply-demand adjustment capabilities. The Company plans to advance the development and construction of approximately 250 grid-connected energy storage facilities nationwide, with a total output capacity of 500 MW, contributing to stable energy supply and the realization of a decarbonized society through energy infrastructure development.

Ōta City, Gunma Prefecture Energy Storage Facility

- Facility Capacity: 2 MW / 8 MWh (High Voltage) - Location: Ōta City, Gunma Prefecture (TEPCO service area) - Battery System: 4 units of Huawei LUNA2000-2.0MWH container-type batteries - Aggregator: Sunvillage Co., Ltd. - Grid Interconnection Date: March 9, 2026 - Supply-Demand Adjustment Market Entry: June 27, 2026

Mishima City, Shizuoka Prefecture Energy Storage Facility

- Facility Capacity: 2 MW / 8 MWh (High Voltage) - Location: Mishima City, Shizuoka Prefecture (TEPCO service area) - Battery System: 3 units of Sungrow ST2752UX container-type batteries - Aggregator: Sunvillage Co., Ltd. - Grid Interconnection Date: April 7, 2026 - Supply-Demand Adjustment Market Entry: June 27, 2026

[Sunvillage]

- Company Name: Sunvillage Co., Ltd. - Representative: Representative Director Choji Mihara - Headquarters: 2nd Floor, West Tower, Otemachi First Square, 1-5-1 Otemachi, Chiyoda-ku, Tokyo - Business Activities: Development of solar power plants and grid-scale energy storage facilities, and renewable energy business - Company Website: https://sunvillage-co-ltd.com/

Public Relations Department, Sunvillage Co., Ltd.

TEL: 03-6810-2685

info@sunvillage-co-ltd.com

FACT BOX

Source: PR TIMES
Category: News
Organizations: HUAWEI / SUNGROW

AI 圖像理解（模型對圖片的判讀，非新聞原文事實） / AI image understanding / AI 画像理解

模型對圖片的判讀，非新聞原文事實 / Model interpretation of images, not source-article facts / モデルによる画像判読で、ニュース原文の事実ではありません

以下為AI對圖片的理解非新聞原文事實

Images show rows of large, white, containerized battery storage systems, likely part of an energy grid infrastructure.

Containerized battery storage units are lined up outdoors under a clear sky, with fencing in the foreground.
Several white containerized battery storage units are situated on a gravel base, with a wooded hillside in the background.

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Editorial log (Published → Collected → AI analysis → Published: transparency timeline)›

Announced　Jul 4, 2026 1:00 AM — Distributor PR TIMES
Collected　Jul 3, 2026 5:48 PM
AI structured & analyzed　Jul 7, 2026 5:27 AM
Desk-reviewed & published　Jul 4, 2026 1:00 AM

FAQ

Who operates these energy storage facilities?

Sunvillage operates them using its own aggregation platform.

What is the supply-demand adjustment market?

A market that balances electricity supply and demand in real time, where storage facilities charge or discharge as needed.

What are the future expansion plans?

The company plans to develop 250 grid-connected storage sites nationwide, totaling 500 MW.

Cite this article — HOW TO CITE

Washin AI News Desk“Two of Sunvillage's Own Energy Storage Facilities in TEPCO Area Enter Supply-Demand Adjustment Market”AI News by Washin Village（和心村）, Jul 4, 2026. https://aeo.washinmura.jp/ai/sunvillage-co-ltd-com/en/news/2026-07-03-%E6%9D%B1%E4%BA%AC%E9%9B%BB%E5%8A%9B%E7%AE%A1%E5%86%85%E3%81%AE%E8%87%AA%E7%A4%BE%E8%93%84%E9%9B%BB%E6%89%802%E3%83%B6%E6%89%80%E3%81%8C%E9%9C%80%E7%B5%A6%E8%AA%BF%E6%95%B4%E5%B8%82%E5%A0%B4%E3%81%AB%E5%8F%82%E5%85%A5

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