Not exactly.
Suppose you have renewable sources that on average generate 100GW. Well, some weeks they're going to average 90GW -- and that will be quite common -- in which case you'd need 10GW of something else. The long-term average (e.g. over 48 hours) is what matters because you'd always need to smooth out the short-term load with batteries.
Some weeks you'll need to make up 20GW, but that will be less often than a 10GW shortfall. Even less often, 30GW. Sometimes, but very rarely, the whole 100GW, or at least say 90GW.
This means that the first 10GW of peaker plants will be quite economical because they get used e.g. 15% of the time, but the last 10GW will only get used <1% of the time and not be competitive with nuclear running ~100% of the time.
So what you end up with is, say, 60GW of renewables, 40GW of nuclear and 50GW of peaker plants that run the ~5% of the time when you have low renewable generation. Instead of needing 100GW of renewables and 90GW of peaker plants, of which 40GW is almost never used.
Suppose you have renewable sources that on average generate 100GW. Well, some weeks they're going to average 90GW -- and that will be quite common -- in which case you'd need 10GW of something else. The long-term average (e.g. over 48 hours) is what matters because you'd always need to smooth out the short-term load with batteries.
Some weeks you'll need to make up 20GW, but that will be less often than a 10GW shortfall. Even less often, 30GW. Sometimes, but very rarely, the whole 100GW, or at least say 90GW.
This means that the first 10GW of peaker plants will be quite economical because they get used e.g. 15% of the time, but the last 10GW will only get used <1% of the time and not be competitive with nuclear running ~100% of the time.
So what you end up with is, say, 60GW of renewables, 40GW of nuclear and 50GW of peaker plants that run the ~5% of the time when you have low renewable generation. Instead of needing 100GW of renewables and 90GW of peaker plants, of which 40GW is almost never used.