Another month goes by, the figures come in, the random number generator whirrs, and we have a winner - this time it's Jean and John, who've been sending in their figures every month since June 2011. Congratulations to them - their prize will be going into the post in the next day or two.
Remember, if you want to have a chance of winning just send us your monthly generation figures. Jean and John were the winners for June - we'd now like to know what you generated in July.
You can see everybody's figures here.