I too have solar, about 5kw (pretending 100% efficient) with a premium feed in. In Victoria you don't get credited for generating, only for what you feed back to the grid. If you're not mining, and use the "average" amount of electricity for a regular household, sure, you could have close to free electricity, on a premium tariff, good luck with that on the standard tariff. I haven't fed anything in (hence no credit) for months. Best I can get is an offset on daytime use, which, is still better than nothing. It would want to be a mighty solar array to get free power, for mining purposes.