80 percent of Europe's electricity could be produced from renewable power without any greater risk of blackouts or flickers.
...
95 percent of our electricity from renewable sources without causing interruptions in the power supply.

Why is this required? Would 'civilization' collapse if we were unable to guarantee uninterrupted power? How about reconfiguring electricity distribution systems with robustness to handle intermittent power? (As it is now, I believe, the power grid does not cope well with interruptions. Nor is it well setup for powering various subparts independently, I think...) If we are truly serious about renewables and sustainability I don't see why 'full power all the time' should be kept as a non-negotiable requirement.