{
  "language": "en",
  "interfaceLanguage": "ar",
  "url": "https://voltformer.com/ar/news/greenvolt-power-breaks-ground-600mw-2400mwh-siedlce-bess-poland",
  "slug": "greenvolt-power-breaks-ground-600mw-2400mwh-siedlce-bess-poland",
  "category": "energy-storage",
  "publishDate": "2026-09-20",
  "sourceName": "Greenvolt Power & Polskie Sieci Elektroenergetyczne (PSE)",
  "sourceUrl": "https://greenvoltpower.com/news/groundbreaking-siedlce-600mw-bess-poland-september-2026",
  "readingTimeMinutes": 5,
  "tags": [
    "Greenvolt Power",
    "BESS",
    "Poland",
    "PSE",
    "Capacity Market",
    "400 kV",
    "Grid Storage"
  ],
  "content": {
    "title": "Greenvolt Power Breaks Ground on 600 MW / 2,400 MWh Siedlce BESS in Poland, Central Europe’s Largest Grid Storage Hub",
    "summary": "Greenvolt Power has officially broken ground on the 600 MW / 2,400 MWh Siedlce utility-scale battery energy storage project in eastern Poland, representing Central and Eastern Europe’s largest standalone grid storage installation.",
    "sections": [
      {
        "heading": "Direct High-Voltage Interconnection to PSE 400 kV Transmission Grid",
        "paragraphs": [
          "Awarded a 17-year capacity agreement under Poland’s state capacity market auction, the 4-hour Siedlce BESS facility is situated adjacent to PSE’s 400 kV Siedlce Ujrzanów substation.",
          "The plant incorporates three dedicated 250 MVA 400/33 kV step-up transformers, containerized lithium iron phosphate (LFP) energy storage enclosures, and centralized liquid thermal management systems engineered for continental winter temperatures."
        ]
      },
      {
        "heading": "Stabilizing the Synchronous Continental European Connection",
        "paragraphs": [
          "With the Baltic States recently desynchronizing from the Russian IPS/UPS grid to synchronize fully with Continental Europe (ENTSO-E), the Siedlce battery facility will provide critical fast frequency response (FCR) and automatic frequency restoration reserve (aFRR).",
          "Commercial operation is targeted for late 2027, unlocking multi-gigawatt onshore and offshore wind integration across the Polish electricity network."
        ]
      }
    ]
  },
  "companies": []
}