The shows, originally planned as the festival’s opening and closing events in February 2021 but due to Covid restrictions had to be rescheduled, will both take place in the main auditorium at An Lanntair.
As well as giving the building resilience in the event of power outages in the main network, the project will also serve as a showcase for smart local grid solutions for the built environment.
Kara is believed to be the first person from the Western Isles to compete at this level.
Shaun Fraser has called for the focus over the next Parliament to be on recovery from the pandemic rather than arguing about referendums or the constitution.
The proposed Stornoway Wind Farm would consist of 33 turbines, most of which would be up to 180 metres tall.