In his article, David Hetherington goes through the numbers, and concludes that a small amount invested in solar reaps significant savings. To gain similar returns in shares, the initial investment would have to be 3 times as large.
What's more, he's talking about being totally self-sufficient (which means the added cost of batteries). Staying on the grid, and producing power from solar panels, costs even less.
[See my solar maths]
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