2026-09-17PR

Grid-scale battery station now capable of "nega-posi operation": supplying 3,800kW of balancing capacity, twice its rated output

系統用蓄電所で「ネガポジ運用」が可能になりました 定格出力の2倍・3,800kWの調整力供出へ

Hirasol Energy announced that its Izumizaki Village grid-scale battery station in Nishishirakawa District, Fukushima, passed pre-qualification for "nega-posi" operation in the balancing market. The 1,900kW station was approved for 3,800kW of offerable capacity across four balancing products, with combined bidding also permitted. The company achieved this using its in-house J-EMS platform and self-made edge devices.

  • operating
  • 福島県西白河郡泉崎村
  • 1.9 MW
  • ヒラソル・エナジー株式会社
  • ヒラソル電設株式会社

Full account

  • Date: September 16, 2026, Hirasol Energy Co., Ltd. (HQ: Bunkyo-ku, Tokyo; CEO: Li Min)
  • Izumizaki Village grid-scale battery station (泉崎村系統用蓄電所), Nishishirakawa District, Fukushima; owned and operated by Hirasol; Tohoku Electric Power area
  • Passed balancing market (需給調整市場) pre-qualification for nega-posi operation; rated output 1,900kW, offerable capacity 3,800kW (2x)
  • Approved for Primary, Secondary ②, Tertiary ①, Tertiary ② products at 3,800kW bid cap each; combined multi-product bidding also enabled
  • Capacities per product are registered as shares of a common adjustment range, not additive; 3,800kW is a bid cap, not a constant bid; actual bids vary with state of charge and operating plans
  • Grid connection date: July 21, 2026
  • Hirasol group handled development, design, construction, procurement, procedures with the general transmission/distribution operator and OCCTO, EMS build, market bidding and control; Hirasol acts as aggregator via its J-EMS platform
  • Design/construction/equipment procurement: Hirasol Densetsu Co., Ltd.
  • Background: balancing capacity unit prices are being lowered in stages; better operation raises asset value without added equipment
  • Posi-only: bid limited to rated discharge output, exits market while charging. Nega-posi: offers curtailed charging (negawatt) plus discharge (posiwatt), up to 2x rated output; classified as "nega-posi type resource"
  • J-EMS forecasts demand and prices in the cloud, bids into wholesale and balancing markets, controls on-site equipment per dispatch
  • For Primary control, battery must stop charging and switch to discharge on detecting frequency change within 10 seconds (30 seconds offline), without cloud communication; achieved by building stop-charge-to-discharge as one action into in-house edge devices
  • Plans to roll out nega-posi know-how to other stations it operates to expand bidding opportunities and stabilize revenue
  • Photo shown is a different station
  • Company: University of Tokyo spinout, founded Feb 21, 2017; businesses include BESS development/operation, "百年ソーラー" long-term solar, FIP conversion and co-located storage, J-EMS DER control
日本語で読む

系統用蓄電所で「ネガポジ運用」が可能になりました 定格出力の2倍・3,800kWの調整力供出へ

  • 2026年9月16日、ヒラソル・エナジー株式会社（本社：東京都文京区、代表取締役：李 旻）発表
  • 福島県西白河郡の「泉崎村系統用蓄電所」（当社所有・運用、東北電力エリア）
  • 需給調整市場の「ネガポジ運用」事前審査に合格。定格出力1,900kWに対し2倍の3,800kWの供出可能量
  • 一次調整力、二次調整力②、三次調整力①、三次調整力②の4商品で供出可能量（入札量上限）3,800kW、複合商品入札も可能
  • 各商品の供出可能量は同一調整領域を共用する内数で単純合算されない。3,800kWは上限で常時入札ではなく、実入札量は充電状態と運転計画で変動
  • 系統連系日：2026年7月21日
  • 開発・設計・施工・機器調達、一般送配電事業者・広域機関手続き、EMS構築、市場入札・制御まで当社グループが一貫。当社が「J-EMS」でアグリゲーター
  • 設計・施工・機器調達：ヒラソル電設株式会社
  • 背景：調整力単価が段階的に引き下げられており、運用高度化で設備追加なく資産価値を向上
  • ポジのみ運用は定格放電出力が上限で充電中は退出。ネガポジ運用は充電抑制（ネガワット）＋放電（ポジワット）で最大2倍、「ネガポジ型リソース」に区分
  • J-EMSはクラウドで需要・価格を予測し卸電力市場・需給調整市場へ入札、指令に基づき機器制御
  • 一次調整力では周波数変化を検知し10秒以内（オフライン30秒以内）に充電停止→放電を完了する必要があり、自社製エッジ機器に一動作として組み込み実現
  • 今後、他の運用蓄電所へ順次展開し入札機会拡大・収益安定化
  • 写真は別の蓄電所
  • 会社：東京大学発、2017年2月21日設立。系統用蓄電所開発・運用、「百年ソーラー®︎」、FIP転換・蓄電池併設、J-EMS開発

Attached to: 泉崎村系統用蓄電所 →