Net Metering Guide: Solar Credits, Net Billing, and Savings

Quick answer

Net metering is a billing arrangement that credits exported solar electricity against grid electricity you use later. The important detail is not the name of the policy; it is the value of each exported kWh and how credits are applied on your bill.

Some utilities still use close-to-retail net metering. Others use net billing, avoided-cost credits, time-of-use export credits, monthly credit limits, or annual true-up rules. Those differences can change payback and battery value.

Net metering vs net billing

Traditional net metering often credits exported solar near the retail rate. Net billing usually values exported energy separately, often below the retail import rate. The financial result can be very different even if both programs appear on a bill as solar credits.

• Retail net metering can make a full-offset system easier to justify because exports are valuable.

• Net billing can reward self-consumption because exported kWh may be worth less than imported kWh.

• Time-of-use export credits can make afternoon and evening production more valuable than midday exports.

Use the Solar ROI guide and Solar ROI Calculator to test export-credit assumptions before trusting a savings claim.

The bill pieces that matter

A solar bill is usually more than one number. To understand net metering, separate usage charges, exported-energy credits, fixed charges, minimum bills, taxes, fees, and any non-bypassable charges that solar may not offset.

• Imported kWh: electricity bought from the grid.

• Exported kWh: solar electricity sent to the grid.

• Credit rate: the value assigned to exported kWh.

• Fixed charges: monthly charges that often remain after solar.

• True-up: the schedule for reconciling credits, charges, or unused balances.

How net metering affects system size

The stronger the export credit, the easier it is to size a system around annual energy offset. The weaker the export credit, the more important it becomes to match solar production with onsite usage or consider storage.

• High export value can support larger systems if roof space and policy rules allow it.

• Low export value can favor smaller systems, load shifting, or battery storage.

• Export limits or interconnection rules can cap how large a useful system should be.

Before finalizing system size, use the solar system sizing guide to compare production goals against your bill structure.

When batteries become more interesting

Batteries are not automatically a financial win, but they become easier to evaluate when exported solar is worth much less than electricity bought from the grid or when time-of-use rates reward stored solar in the evening.

• Compare solar-only ROI against solar-plus-battery ROI.

• Check whether battery savings depend on time-of-use rates, outage value, or export-credit differences.

• Size the battery around critical loads before assuming whole-home backup.

If storage is part of the plan, review the solar battery buying guide and run the Battery Sizer.

Questions to ask your utility or installer

Net-metering rules change by utility, state, tariff, and date. A good proposal should explain the actual rate plan used in the savings estimate.

• What credit rate is used for exported kWh?

• Are credits monthly, annual, or tied to a true-up date?

• Do unused credits expire, roll over, or convert to a lower value?

• Do fixed charges, minimum bills, or non-bypassable charges remain?

• Are there system-size caps, export limits, or interconnection constraints?

• Does the proposal assume current rules remain unchanged for the full payback period?

Common net-metering mistakes

Most net-metering mistakes come from treating every exported kWh as if it equals the retail rate. That may be true in some places, but it is not a safe default.

• Assuming net metering and net billing are the same.

• Ignoring fixed charges that solar does not offset.

• Using a national average electricity rate instead of the actual utility tariff.

• Sizing for 100 percent annual offset when exported kWh have weak value.

• Forgetting that rules can change for new customers or future interconnections.

Recommended path through the net-metering cluster

Start here to understand export value. Then check costs with the solar cost guide, payback with the solar payback guide, and full return with the Solar ROI guide.

For a practical bill walkthrough, read how net metering affects your electric bill.

Bottom line

Net metering is not one universal rule. The real question is how exported solar is credited, what charges remain, and whether the policy supports your system size, payback, and battery strategy. Verify the tariff before accepting any savings estimate.