France has a lot of water power which helps with balancing the grid and Germany never had more than 30% of nuclear in the mix, so basically little load followin

France has a lot of water power which helps with balancing the grid and Germany never had more than 30% of nuclear in the mix, so basically little load following was required. Also, both countries, as most industry nations, tried hard to shape the consumption to be constant over time. Like extra cheap electricity in the night which lead to heating systems which would electrically heat up over night and dispense the heat during the day. Also, the European grid helps a lot with balancing, electricity is constantly traded and exchanged between the countries.