

Volt is not part of the European Green Party. But within the EP European and national parties with overlapping goals form groupings. Volt joined the Green grouping (Greens/EFA) after the last election. As far as I know they might join the green grouping again or go with the liberal grouping (Renew/ALDE). They share goals with both of them. I would label them progressive liberals.
The concept of baseline power is no longer needed. Scientists wrote about that for years now. Battery storage and smart grids are growing faster and cheaper than nuclear ever could.