SSE reported output from its renewable energy generating assets 10% lower than expected in the first nine months of the 2018-2019 financial year, as a result of dry and still weather.
The company generated 6.6 terrawatt-hours of electricity in the period, up slightly on the 6.5TWh produced in 2017-2018, according to its nine-month trading statement.
Wind output was 4.1TWh, compared with 4.0TWh the previous year, while hydro generation was down to 2.4TWh from 2.5TWh.
Overall installed clean power capacity at the end of December stood at 3.9GW, up from 3.8GW at the end of 2017.
SSE chief executive Alistair Phillips-Davies said: “We continue to make good progress in our core businesses of regulated energy networks and renewable energy, complemented by flexible thermal generation and business energy sales.
“We have also demonstrated our ability to create value for shareholders through the recent sales of stakes in our telecoms business and selected onshore wind farms with expected proceeds of over £1bn.
“We are also making progress in assessing the options for the future of the Energy Services business.
“SSE has a clear strategy and good long-term prospects for its high-quality core businesses and assets that contribute to the transition to a low carbon economy and will support the creation of value and delivery of our dividend plan in the years to come.”