Net metering
Your utility's scheme for crediting power you export. The market gives that power a better buyer; unsold blocks fall back to net metering.
Under net metering your meter runs backwards when you export, and the utility credits you at a rate it sets, sometimes retail, often much less.
Selling on the market does not replace net metering. It sits on top of it. Blocks that clear are paid by the buyer; blocks that do not are credited by the utility exactly as before. You never do worse than net metering alone.