Electricity Bill & Rebate

This month has been a good one financially. Not only have tax refunds come from the ATO (without the delay forecast by our tax agent) but also the rebate from the Federal Government from the Solar Homes and Communities Plan.
The only thing that hasn't come is my electricity bill, though the direct debits are occurring monthly. So I called my Electricity Provider and they have promised to send the bill within 10 days. It also looks like the Off-Peak Tariff is not happening - though without the bill I can't be sure.
Complicating the bill is the change is electricity costs in January which will make the bill a computational nightmare. Thanks goodness I have a computer and mathematically inclined offspring.
Today is a lovely fine autumn day so we are still generating 4KwH on these days.
Yesterday was an entirely different story with < 1 KwH only generated. However the water tanks are full, the garden growing as is the weedy lawn and the birds drinking the nectar from the flowering camellia's.