If you’re already powering your home with solar and you’re an SCE customer, then I suggest you read more about how NEM (Net Energy Metering) works when going solar. I like to discuss more about how to better understand the billing that you’ll receive once your system has been officially activated.
With NEM, a credit is applied to your bill to offset all or part of the cost that’s associated with the energy consumed in your home. SCE will provide you with 2 bills, an annual bill that shows the “net” energy consumed over the previous 12 months and a monthly bill for nominal non-energy related costs such as tax and fees associated with being an SCE customer. The monthly bill will also show each month’s energy usage charge (if any), however you’re not required to pay these charges on a monthly basis because most likely your energy consumption may fluctuate throughout the year. That’s why there’s an annual bill that will include your energy usage charges for the last 12 months, termed by SCE as “relevant period”. Hence, your energy is tracked month to month and at the end of 12 months the energy is added together along with any credit you sent to SCE from your solar system.
Your electric bill after solar will show only Net kw/h which is the solar production and your house consumption combined. The utility NET kw/h equals solar production minus house consumption for that time. For example, if in the month of September your utility net is 200 Kw/h and your solar monitoring is showing production of 700 kw/h that means in September’s usage was 500 kw/h and 200 kw/h went back to grid. If NET is 0 then usage for that month was more than production.
At the end of 12 months, if you have a total amount due then it will be listed on the annual bill. If the bill is showing charges then it will be due. If you have excess energy credits your annual bill will not charge you, however, keep in that at the end of annual year those credits won’t be able to roll over to the following year or month of new relevant period.