SSE Renewables, part of British utility SSE PLC (<a href="https://www.londonstockexchange.com/stock/SSE/sse-plc/company-page" target="_blank">LON:SSE</a>), announced today that it was completed the construction of the required exploratory tunnel at the site of the Coire Glas pumped hydro storage project in the Scottish Highlands which has a targeted capacity of up to 1.3 GW.