As has already been noted, this article is essentially nonsense. I had a 7 kW home charger installed last year (for £600 after the grant was taken into account) and there was no problem with the supply -- as you would hope, given that even at full blast the charger draws less current than our 9.5 kW shower! (Note that the car regulates charging so that it does not always go at 7 kW.)
As for the cost of the charger, look at it in this 'back of an envelope' way. The electric car is doing about 3.5 miles per kWh in the winter (naturally, it was rather more when the weather was better). On my current electricity tariff, that means the 'fuel' cost is 5p per mile in round numbers. Let's be cautiously pessimistic and suppose that it will double to 10p per mile when my fixed rate tariff ends in a couple of months.
For comparison, my turbo petrol (non-hybrid) Toyota Auris averages around 40 mpg in winter. With petrol around here being £1.50 per litre, that means a fuel cost of 17p per mile. So, even with my pessimistic assumption about future electricity prices, the saving of 7p per mile would pay for the charger after about 8,600 miles, which is is only slightly more than my projected annual mileage for the electric car.
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