German developer and operator of large-scale battery energy storage systems Green Flexibility has secured over EUR 1 billion (USD 1.03bn) for investments thanks to support from Swiss private equity firm Partners Group (<a href="https://www.six-group.com/en/products-services/the-swiss-stock-exchange/market-data/shares/share-explorer/share-details.CH0024608827CHF4.html#/" target="_blank">SWX:PGHN</a>), the companies said on Thursday.