SSE's renewables output dropped 19% below expectations in the six months to September 30.
It's due to adverse weather conditions, which represents a 7% shortfall relative to the full year's planned output.
Progress is continuing on a number of net zero projects, with the Acorn cluster being one of two projects to be selected to advance to Track 2 of the cluster sequencing process.
SSE is also finalising the commissioning of Seagreen, Scotland's largest and the world's deepest fixed bottom offshore wind farm.
And first power is expected on the world's largest offshore wind farm in the coming days.
A license to develop a wind farm at Dogger Bank, about 100km off the east coast of England, was awarded in 2010.
'Key milestones' reached
SSE's full-year performance remains subject to weather conditions, plant performance and market conditions.
Finance Director George Alexander said: "Our primary focus remains on delivery of our five-year plan out to 2027, which is the platform for up to £40bn of investment in net zero over the next decade.
"We have reached key milestones in the construction of our flagship renewables projects while gearing up to accelerate the build-out of critical network infrastructure and offering much-needed flexibility to the system.
"Our strong balance sheet and financial discipline continue to allow us to progress growth options within our diversified pipeline selectively. In the long-term, there remains broad support for the accelerated build-out of secure, affordable, low-carbon electricity infrastructure - both in the UK and internationally - enabling the continued creation of shareholder and societal value."
FTSE 100
The UK's top share index, the FTSE 100, was up eight-points at 7,420 shortly after opening this morning.
Brent crude futures were up 0.69% this morning at $86.40 a barrel.
Companies reporting today
Ferrexpo has a Q3 production report.
Imperial Brands and Pennon both have trading statements.
Volution Group is reporting full year results.