Solar installed at the Inverness Water Treatment Works. Image: Scottish Water Work has started on Scottish Water’s latest solar installation, which is also set to include Invinity Energy Systems' vanadium flow batteries. The £2 million project is the largest single solar energy investment made by Scottish Water Horizons and will see 1MW of solar installed on land adjoining the Perth Waste Water Treatment Works by Absolute Solar and Wind. The 2,520 solar panels will be co-located with four vanadium flow batteries capable of storing up to 0.8MWh of energy. These will be provided by Invinity and are to be assembled at its manufacturing and testing facility in Bathgate, West Lothian.