Electricity, at least here, mostly comes from natural gas and nuclear. TVA is still spending a ton of money on both of those, at least for now. The Texas failure had more to do with NG failure then anything and poor regulatory policies/requirements (probably would require a different thread to dive into).
I agree, there is nothing green about an all-electric vehicle, for me it would be about the performance. I would actually expect the towing performance to be more impressive with the electric truck but time will tell on the performance numbers...remember I said 10 years from now, I expect technology to improve significantly. If they can get the range up to 400-500 miles with decently quick recharge then I'd be fine with it.
The grid is an interesting and valid discussion in certain areas. Then again TVA just had some pretty significant incentives to add load to the system (electrification incentive to pay people not to install NG equipment) due to reduction in load on the grid over time. Buildings are becoming significantly more efficient and improving all the time.
At least on the Tesla side, you can get an 80% recharge in 20 minutes and get 300-350 miles on that charge. Not ideal but not terrible.
That's why I said "new." Increased demand will either require more supply, rationing, or massive price increases to convince users to not use the AC, television, washer, etc. The two most recent nuke plants in the US were started in 1973 and came online in 1996 and 2016 respectively (Watts Bar 1 and 2). As the environmental nazism will get far worse, I can't see nuke plants or any fossil fuel plants coming online in the foreseeable future without tremendous legal problems and excessive costs.
Performance should be hellaciously good, as you can put a lot of power into fairly small electric motors. So long as they can be charged, anyway. All comes back to the electricity...