I'm a little bit stunned about the ignorant (I mean that in the nicest way) math in this thread. No, EVs are not adding that much generation load to the grid. And you're making some kind of massive instantaneous change fallacy. EV penetration is not going to increase massively in a short amount of time.
First of all; the original post was about distribution network load. Not generation capacity. There's plenty of energy storage and generation capacity in Norway to handle much, MUCH higher EV penetration. It's all about the wires actually delivering the energy, and then only to relative fast-chargers. And then only to locations previously not outfitted with heater outlets.
Secondly; we already have 100% functional, 40-year tested overnight EV charging infrastructure in Scandinavia. It's called mantle heaters. These suck about 10-15kWh per day just to keep the fuel and coolant from freezing. That's well in excess of average energy need for cars. In winter, they service about 30-35% of all the cars at once. This is a solved energy distribution problem. You do that with thicker cables (typ. 250/300A), which cost very little extra on top of regular 100/133A LV three-phase distribution cable.
Thirdly; no, total energy demand will not go up appreciably. Say we invent a country with only passenger cars that has an average 100M vehicle kilometers per year demand at 15km/L, so 6.7M litres of gasoline per year. At 150Wh/km, that's going to be replaced by 15GWh of electricity. Say we lose 20% in transmission, distribution and charging (substitute whatever you think is right, I'll stick by TenneT's numbers + tesla chargers), that gives us 19GWh primary electricity remand.
A US gallon of gasoline requires about 6kWh to be produced (
https://greentransportation.info/energy-transportation/gasoline-costs-6kwh.html <--read for more context). We are displacing 6.7M L = 1.8M gal = 10.8GWh of refining/mining/distribution electricity cost. Total energy increase is thus only about a third.
But wait, there's more! The vast majority of charging does not happen at peak times, and electric grids (as well as generation) does not care about anything but peak demand as far as limits on the infrastructure go. Smart charging will further perform demand response on actual generation capacity to smooth out capacity. This leads to the assertion by most grid infra experts that most likely, no generation additions are required at all even for a 100% transition to electric road vehicles. At most, average energy increase numbers around 10% is what I see in literature. Not even the 50% you'd expect.
So, now you say: but what about the distribution network? Didn't we just discuss that being overloaded by Teslas in Norway?
Generation, transmission and distribution are sized to peak loads, not average loads. Because there is practically no demand response and no energy storage on the grid, generators have to modulate their electric output to instantaneous demand, which fluctuates quite widely. Here's a very typical dispatch curve for instance:
The first dotted line is average minimum load, the second is average and the third is peak. The very rightmost part of the graph, near 80GW, is still 25% over the typical peak and in most systems you can go over that a decent bit more before tripping anything if the load is sufficiently distributed. This means at any time of the day, only about 40-50% of dispatchable generation is actually online and most of the reserve just sits there for a few days of the year (or in case of the top 10% of generation: a few *hours* per year) when for some reason demand peaks that high.
So if you look at the integral demand on the grid, and this goes for both generation and distribution, it is at most maybe 20-25% of actual peak, we-run-this-baby-all-the-time capacity. There is plenty more juice to be strangled from the grid with literally zero upgrades, just by distributing demand into less problematic parts of the day.
This is the *big* opportunity for battery storage. Batteries have way too low energy density to do seasonal storage, but they are awesome for load-shifting a couple of hours. Then, instead of overloading the grid during peak hours and paying a higher price for electricity as a result (and possibly requiring massive upgrades), you actually consume that energy from the grid at low-demand times. This increases generator value as well over the entire day, alleviating some other intermittency issues with especially renewables and nuclear as well.