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For someone who champions EV, I would expect you to actually have Up to date facts. The Porsche Taycan price is £83,367. When Tesla have finished developing their Tesla S Plaid, the cost will be closer if not more than the £150k for the top model Taycan.*sigh, I just can't resist. I hate incorrect assertions or only telling half the story.
The real situation is quite different to the picture you've painted, the Porasche Taycan can charge at over 200 kW using its 800v system. There are only 12 chargers capable of this in UK, across 3 locations, only 4 stalls per site.
Vast majority of UK rapid chargers are 50kW, less than a quater of Taycan's capabilities.
The 2000 rapid chargers you've quoted are all dotted around the place, usually 1 or 2 per site.
Whereas the 290 Tesla superchargers (source? is this up to date?) are built in clusters. Meaning Tesla superchargers have higher availability and thus more reliable as charging network. There are currently 52 locations (27 more are "coming soon"), using your 290 gives average of 5.57 stalls per site.
https://www.tesla.com/en_GB/findus/list/superchargers/United Kingdom
There is vehicles of similar price and size. It's not like Taycan or I-Pace are completely new and unique.
Let's see:
Comparable to Taycan: performance saloons: Panamera, E or S class, 5 or 7 series, etc.
Comparable to I-Pace: mid-size SUV's: Q5, Jag's own E-Pace, X3, etc
Model X is not similar price and size to I-Pace.
Model S is not similar price to Taycan. £100k vs £150k as shown in the TG video.
Home batteries?
Unfortunately Vehicle-2-Grid technology is still in its infancy. All 7kW home chargers installed today can only allow the power flow 1 way.
This is the future really. Get home, plug in the car, and use remaining charge in the car to reduce peak time demand on the grid (where the price should be most expensive). Overnight during off-peak, the car would charge up and ready for another day.
This is the reason for smart meters. You can then do per-hour or half-hour pricing. Which currently translates to much cheaper tariff during off-peak hours and slightly more expensive during peak times.
Eg. https://octopus.energy/agile/
Why are you trying to compare Electric cars with ice models. The comment was about comparing EV's and as there are so few like for like models true comparisons can't be made.
The 290 Tesla supercharger was correct in July this year. Source? There is this search engine called Google, try it. Around the same time there was 2000 alternative rapid chargers with plans to double that over the next few years. I don't see how you could believe 290 Tesla supercharger spread over the UK could be a better network than 2000 alternative rapid chargers spread over the same area.