With 37GWh of electricity generated, carbon emissions were down 3.5% compared to the previous year, and 16% overall since 2006/07.
The data, unveiled in its 2016 Sustainability Report, comes as Scottish Water secured £9m to boost 24 existing solar sites. The water utility company already has 25 sites with hydro turbines, as well as 18 wind-powered sites.
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The schemes form part of a £3.5 billion six-year investment plan to improve drinking water quality, enhance the environment and support the economy.
Chris Toop, General Manager for Scottish Water's energy programme, said: "These investments help to reduce the long-term cost of providing vital water and wastewater services to customers.
"The benefit from our whole energy programme now exceeds £6m annually and we have ambition to do more."
Andrew MacDonald, head of Scottish Water Horizons, added: "We continue to harness the vast natural and renewable energy resources that Scotland has.
"As a Hydro Nation we are driven to extract sustainable benefits from every phase of the water cycle using both proven and innovative technologies."
(LM/JP)
