The difference between how much electricity you generate and use. A negative Total Usage number means that you generated more electricity than you used for that billing period. Market Net Metering Credit is based on 60% of your excess generation. For this example, 384 kWh were generated. The credit is calculated using 60% of that, 230 kWh. Net Met Cr: The net metering credit is the sum of the following: distribution, transmission, transition, and fixed basic service. Review our service rates and supply costs.