With current tech you can get fairly easily (not necessarily cheap) to 80% renewables penetration in Europe. The rest of the 20% could then be covered by coal,

With current tech you can get fairly easily (not necessarily cheap) to 80% renewables penetration in Europe. The rest of the 20% could then be covered by coal, gas, biomass and nuclear. Mind you if the goal is to get Russia out of the European gas market, by greatly increasing the amount of renewables we use the rest could be supplied by LNG + Norwegian/Dutch/English fields.