Net metering, in plain English
Think of the grid as a giant battery you never pay to install. You put power in when the sun is up, you take it back out at night, and EPCOR keeps the tab. That tab is net metering.
Sun is up. The meter runs backward.
Your house gets served first, straight off the roof. Whatever is left leaves through the meter and your retailer credits it. You are not storing anything. The grid is doing the storing for you, and you never paid to install it.
After dark. The meter runs forward again.
No sun means no production, so the house pulls from the grid like every other house on the street. The difference is that you are spending credits you already banked instead of cash.
Billing period. The two directions get netted.
At the end of the cycle the software subtracts what you took from what you sent. Send more than you took and you carry a credit forward. That netting is the whole of net metering. Everything else on this page is detail.