Net Metering Explained: The Rule That Prices Your Sunshine

Key Takeaways

• Net metering is the price tag on your exports — and therefore the single policy that moves solar payback more than any hardware decision.
• The classic version credits full retail (the grid as free battery); the successor, net billing, prices exports below retail — sometimes far below.
• The national drift is toward stingier exports with grandfathering for existing customers — making today's terms an asset worth locking and protecting.
• Three lines to read before signing anything: export rate, grandfathering length, credit rollover rules.

The meter math, plainly

A grid-tied solar home pushes power out at noon and pulls it in at night; the meter counts both directions, and net metering is the rulebook for settling them. Classic (full-retail) net metering makes it beautifully dumb: every exported kWh cancels an imported one at the same price, the annual ledger nets toward zero, and the grid performs the battery's job for free. Net billing breaks the symmetry: imports at retail, exports at a lower administered rate — the gap that California made famous and that batteries exist to arbitrage.

Which regime you're under decides system design more than sun does: full retail rewards sizing to full usage; net billing rewards self-consumption, load-shifting, and storage.

Why the rules keep changing

The policy fight is genuine on both sides. Utilities contend full-retail credits let solar homes ride the grid — its wires, its standby capacity — while paying little toward it, shifting fixed costs onto non-solar neighbors as adoption scales. Solar advocates counter that distributed generation delivers grid values (peak shaving, avoided transmission) the utility math undercounts. Regulators split the difference state by state, and the national trajectory is unmistakable: export compensation drifts downward as solar penetration rises, with Florida's intact full-retail rules increasingly the exception that proves it.

The buyer's takeaway isn't to litigate the economics — it's to notice the direction. Terms you sign today are commonly grandfathered for years or decades when rules change; the household that interconnects under good rules holds an appreciating contract, which is also why battery retrofits must be checked against grandfathering before touching anything.

Reading your own tariff in ten minutes

Your utility's net metering or interconnection page carries these; DSIRE indexes every state's framework.

The rollover line deserves its footnote: annual true-ups that pay out surpluses at wholesale (or wipe them) mean oversizing donates the excess — one more reason this site keeps repeating size to usage, not to roof.

The strategy that survives every regime

Whatever your state does: self-consumption never devalues. A kWh used as it's made is worth retail under every rulebook ever written, which is why the durable playbook — daytime loads, EV charging in the solar window, storage where spreads justify — keeps appearing across this site. Net metering sets the price of what you share; the habits set how much you need to. Read the tariff, lock good terms while they exist, and build the self-consumption reflexes that make the next rule change somebody else's problem.