That will never be possible these days. It was possible once, but those days are long gone.
Think about it.
Do you really expect the privately owned utility supply companies to supply power and maintain all the lines and equipment at zero cost, just so you can draw power whenever you feel like doing so ?
They keep changing the rules, especially as more and more people think they can zero out their power bills with a grid tie system.
Feed in tariff gets less, the maximum allowed size of your inverter, and total number of panels allowed under the rules keeps changing and shrinking. In Australia they are now trying to prevent people from going totally off grid by limiting battery size.
They absolutely have to do all this or run at a loss and go out of business.
Its a self perpetuating disaster for the power utilities, and the government will keep bringing in tighter rules to keep the whole system financially viable.
And you are never going to be able to beat that by playing by their rules.
Its like a rigged casino
The only way to win is not to play.
Go outlaw, just give them the middle finger and go totally off grid.