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You would not be taxed for generated energy. Imagine that the cost for you to buy one kWh is ~20 cents. Currently, when you push power back into the grid you get 20 cents back from the power company. The government makes this so. However, the power company actually only really needs to bill you about 4-6 cents (depending on which one you ask). The rest is taxation. This means that after the government stops subsidising panels, you would just get 4-6 cents back per kWh.

Of course this makes the value proposition for moving power into the grid much worse, but it changes precisely nothing for power that you use from your panels (you are still getting 20 cents worth of power from a panel that has already been paid for by you).

For this reason it is best to rely on the subsidy as little as possible and maximise the power you use directly from the panel, either by changing your habits or by storing the power for later (in a battery). Sadly using batteries adds additional costs to this picture and is not currently worth it at all, even without subsidies.

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