Lithium & The Future, page-1485

I think he's referring to people whose pensions are reduced because they have too many assets. If you spend money on a PV + storage system that money is no longer an assessable asset (as it is part of your home) and so your pension goes up. Your pension has now gone up and you no longer have an electricity bill. i.e. you're better off.

Similarly, if you're on a high tax rate and have spare cash to invest. Any earnings that money makes are taxed at your marginal rate, but if you invest in PV and storage the savings you make are not taxed, so likewise you're better off.

Of course the above only works if the savings you make do indeed compete with grid power as the article asserts. But even if they don't, it might still be worthwhile if the margin is less than the tax savings.

Declaration: I am NOT a tax specialist (although I do pay tax). The above is my opinion only. It is based on my understanding of the tax laws. Please DYOR