We pay $50 per month real money for the service, regardless of the net metering. If we are net producers in a given month, we pay nothing additional for power, and get a credit (in kwh) that rolls forward to the next month. If we are net users, after applying any rolled forward credits, we pay for the net usage in addition to the $50. Once a year, any rolled forward credits not used are paid to us at what amounts to wholesale rates, so we start over with zero credit balance.