The transformer next to you house owned by the utility is called a distribution transformer.
The transformer in a substation is called a substation transformer.
A Tesla charging at 40A (about the max you can expect) is 9.6 kW not 15 kW.
My car charges at 72 amps, 17.28 kW at 240 volts. Even so 9.6 kW for a longer time is the same problem on the average. It will just be a bit later on the adoption curve when this starts to be a problem for distribution. I can also see a lower charging rate meaning an EV owner being more careful to charge every night.
Charging a Model 3 LR using the supplies cord (32 A) is 7.68 kW
Ok, lets work with this number then since the model 3s will be the vast majority of Teslas on the road going forward and I guess it is reasonable to expect most will use the mobile cord on a 14-50 outlet rather than install an HPWC.
In the North Texas area out peak load is usually June - September, Monday - Friday, Noon to 8 PM.
Weekends and holidays are excluded because industry and business are generally shut down or at greatly reduced usage.
Not sure why you are posting this. The overall demand peak is not of consequence for this discussion. What is important is the load on the residential grid during the residential demand peaks.
When my house was built, most people (and builders) installed A/C units with 8.0 SEER or so. Average size was 3-4 tons.
Now I think the standard is 12.0 SEER and my next unit will be far above that. So a 3.5 ton 8.0 SEER unit draws about 5.25 kW while a 3.5 tom 12 SEER unit draws about 3.5 kW. That is a difference of 1.75 kW. We also know that LED lighting, LED TV's, refrigerators, washers and dryers have reduced demand. So there is some wiggle room.
In your area what do they use for backup heat to the heat pump? Where I am it is usually straight electric. That is the issue since straight electric at 15 kW is what will be seen as a load. If the distribution transformers and wiring are sized to the demand of the heat pumps, you can see the distribution grid will already be stressed on cold nights. No?
I have natural gas so my winter demand is almost nothing. But those with all electric service often end up with a winter peak demand higher than their summer peak (even with a heat pump you'll be running some resistance heat at the peak) so that can determine their transformer and service sizing giving more overhead for adding extra load in the summer.
Yes, that is exactly my point. But I haven't heard anyone say they size distribution with full knowledge of each home's exact consumption configuration. That also changes. My old house had oil heat. Then an air conditioner was added. Then the AC was replaced with a heat pump. I don't see any indication the transformers have changed in my neighborhood.
While we're discussing extra capacity, our sizing algorithm always over sizes by a certain amount because we do not want to have to come back to the house or subdivision and add capacity and we know that people seem to add load in various ways.
What is the algorithm? How much does it oversize? Whatever that amount is I doubt it allowed for the comparatively large extra capacity needed for EV charging.
Fun fact - Our research shows that on the average a water heater (5 kW) adds only about 500 W to the peak demand at the generating level. Probably close to that at the substation transformer level. Water heaters just don't run much between noon and 8 PM.
Generation is not the issue. Even if they run a lot of watts, they don't run for hours. They typically run for a few minutes and shut off. When hot water is used they run enough to replace the hot water used. Unless someone takes a shower, that's not so much. Since even in the smaller statistical scale of local distribution running for 5 or 10 minutes is not such a big deal.
Generation in Texas has been 'deregulated' for many years so as load grows generation will also grow.
We in Texas now get 20% of our generation from wind. And it will only grow. So our Teslas get greener every day.
As far as I know generation is deregulated everywhere in the US. But don't assume generation will magically keep up with demand. There are places where deregulation simply means prices increase since a constant shortage of power is in the interest of the generating companies. Not entirely unlike OPEC. Ask someone in California. I understand there are still issues with supply there, especially now that they have so much solar generation which fails every day and supplies nothing in the evening.