Spanish renewables firm Zelestra has started building a 6.5-MWdc solar farm in the region of Puglia, southern Italy, which forms part of a solar duo that will supply clean energy under contracts with Swiss energy group BKW AG (<a href="https://www.six-group.com/en/market-data/shares/share-explorer/share-details.CH0130293662CHF4.html#/" target="_blank">SWX:BKW</a>).