They'll always charge more for what they sell than what they buy.
Last month I was charged $96.02 for the 143 kWh I bought from the grid, but only paid $25.30 for the 248 kWh I fed back into the grid.
LAST MONTH CHARGED FROM GRID $0.36 kwh PAID for putting BACK TO GRID $0.713 kwh WHAT PART OF THAT DONT YOU UNDERSTAND neil