Perhaps there is a parasitic load rate that can incentivize a grid upgrade in a way that is fundable.
It seems like you don't understand markets. When there's a huge source of potential revenue, markets cause players to try and supply that market. You don't have to incentivize anything. As demand increases, capacity buildout increases. The reason people pay up front (like by investing in upgrades and new plants) is for future payoff. It's called investing.
A car consumers orders of magnitude more power than a home, it's not even comparable.
It's not quite an order of magnitude. If I were to do my regular 20,000 miles a year in an electric car it would take about 5,000 kWh to do it, which would increase my annual electricity usage by 42%. To reach an order of magnitude I would have to have about 25 people driving that much and charging off of my power.
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