Household prices are meaningless in this context, because they are artificially kept low in France and sometimes are affected by taxes and fees elsewhere.
The true comparison require a lot of data and work. One would have to first calculate how much subsidies that each government spend on energy production, how much tax money is spent on grid stability, how much the taxes are, how high the fee is for grid connection, and how much easy producer take.
Spot market prices is just whatever the price is in EU, since all the grids are connected and every country in EU must trade if they have surplus energy. It represent the collective supply and demand within EU.
Thanks to that indeed, but the future doesn't look great, as little has been done in the last 20 years. So France will have to do a lot in the next decade, and that may change our prices.
There's a important lesson about using nuclear power as an energy source in there. Contrast that with Germany which is shuttering their nuclear power plants in favor of renewables.
There is no such lesson. EDF is going bankrupt, France is spending billions trying to replace reactors aging out and about 20% or so of the ~70 billion decommissioning costs are funded.
The important lesson here should be that retail prices != prices.
