Solar Net Metering Explained

What is net metering?

Net metering is a billing arrangement between solar panel owners and their electric utility. When your solar panels produce more electricity than you're using at that moment, the excess flows into the electric grid. Your utility gives you credit for this exported electricity, which offsets the cost of electricity you import from the grid at other times.

The term “net” refers to the netting of imports and exports. At the end of each billing period, your utility calculates the net difference between what you pulled from the grid and what you pushed to it. If you exported more than you imported, you may have a credit balance that rolls forward.

How the meter works

With traditional net metering, a bidirectional meter tracks electricity flowing in both directions. When you're drawing power, it registers positive. When you're exporting, it registers negative. At the end of the month, the utility reads the net position.

Modern smart meters can record both import and export separately in 15-minute intervals. This enables more sophisticated billing arrangements like time-of-use rates and time-of-export credits, where the value of your exports depends on when you generate them.

How billing credits work

The mechanics of net metering credits determine how much value your solar system delivers. Not all net metering is equal.

Monthly billing cycle

Each month, your utility calculates:

• Total imports: Electricity you drew from the grid (mostly at night and on cloudy days)
• Total exports: Electricity you sent to the grid (mostly midday when solar peaks)
• Net position: Imports minus exports (or vice versa)

If you were a net importer, you pay for the difference at your applicable rate. If you were a net exporter, you receive credits. How those credits are valued is where policies diverge.

Credit rollover

Most net metering programs let credits roll forward month to month. You generate excess credits in sunny summer months and use them during darker winter months. At the end of a “true-up” period (typically 12 months), the utility settles any remaining balance.

What happens to leftover credits at true-up varies by state. Some utilities pay out at avoided cost. Others forfeit unused credits. Others let them roll indefinitely.

Net metering credit valuation

The value of your exported electricity is the most important variable in solar economics. Three main approaches exist:

Retail-rate (1:1) net metering

Under retail-rate net metering, every kWh you export earns a credit equal to the full retail rate you pay for imports. If you pay 15 cents per kWh, you receive 15 cents per kWh credit for exports.

This is the most favorable policy for solar owners. It means you're effectively “storing” your excess solar in the grid at no cost and retrieving it later at the same value. Systems can be sized larger because oversized production still has full value.

Retail-rate net metering has been the standard historically but is becoming less common as solar adoption increases.

Avoided-cost net metering

Under avoided-cost net metering, exports are credited at the utility's avoided cost — what the utility would have paid to generate or purchase that electricity from another source. This is typically the wholesale market price, which may be 3-8 cents per kWh depending on the region.

With avoided-cost compensation, solar owners receive significantly less for exports than they pay for imports. A system that exports heavily may have poor economics, even if total generation covers annual usage.

Time-of-export rates

Time-of-export rates vary the credit value based on when you generate power. Exports during peak demand hours (typically late afternoon into evening) receive higher credits. Exports during off-peak hours (including midday when solar is most abundant) receive lower credits.

This approach recognizes that electricity value varies by time of day. Solar power generated at noon is worth less than power available at 6 PM when demand peaks. California's NEM 3.0 policy uses time-of-export rates, dramatically reducing the value of midday exports.

State-by-state variation

Net metering policies are set by state regulators and vary significantly. There is no federal net metering mandate. Each state (and sometimes each utility) has its own rules.

Strong net metering states

States with favorable policies typically offer:

• Retail-rate or near-retail credits
• Indefinite credit rollover
• No caps on system size
• No extra fees for solar customers

New Jersey, Massachusetts, and New York have historically strong net metering, though policies evolve. Pennsylvania offers net metering for systems up to 50 kW at retail rate for most utilities.

Transitioning states

California transitioned to NEM 3.0 in April 2023, reducing average export values by roughly 75% for new solar installations. Arizona moved away from retail-rate net metering several years earlier. Nevada reduced net metering credits, then partially restored them after public backlash.

Weak or no net metering states

Some states have no statewide net metering requirement, leaving policies to individual utilities. Alabama, Tennessee, and South Dakota are among states where net metering access varies by utility and may be limited or unavailable.

Why policies vary

State policies reflect different perspectives on cost allocation. Net metering critics argue that solar customers shift grid costs to non-solar customers. Proponents counter that solar provides grid benefits (reduced peak demand, avoided transmission losses, emissions reductions) that justify retail-rate credits.

The debate is technically complex. Both sides cite studies supporting their position. The political outcome depends on which perspective dominates in each state's regulatory process.

When net metering isn't enough

Net metering has limitations that affect solar system design and economics:

Timing mismatch

Solar produces most electricity at midday. Most households use most electricity in the morning and evening. Without storage, much of your solar production is exported. If export credits are low, this mismatch hurts economics.

Fixed charges

Net metering credits typically offset only the variable portion of your bill (the per-kWh charge). Fixed monthly charges for grid connection, metering, and customer service remain. In states with high fixed charges, solar savings are limited even with perfect net metering.

System size limitations

Many net metering programs cap system size at your historical usage or a specific kW limit. Oversized systems may not receive net metering credit for excess generation, or may be forced onto less-favorable rate schedules.

True-up losses

If you over-generate annually and your utility pays out leftover credits at avoided cost (not retail), you lose value on every kWh that wasn't used within the year.

Why net metering is changing

Several factors are driving net metering policy changes:

Solar penetration

When solar was rare, net metering costs were trivial. As adoption grows, the aggregate cost of credits increases. Utilities argue that non-solar customers bear these costs through higher rates.

Cost-shift concerns

The “cost shift” argument holds that solar customers use the grid (for nighttime power and as a backup) but pay less toward grid maintenance because they have lower net usage. Grid costs are then spread across fewer kWh from non-solar customers, raising their rates.

Solar advocates dispute the cost-shift framing, arguing that solar provides grid benefits (reduced generation costs, avoided transmission investment, environmental compliance) that offset or exceed the credit costs.

Utility economics

Traditional utility business models earn returns on capital investment. Rooftop solar reduces demand for utility-scale generation investment. Some observers see net metering changes as utilities protecting their business model. Others see it as legitimate cost allocation.

The battery storage question

As net metering credits shrink, battery storage becomes more attractive. The math is straightforward:

• Without storage: You export excess solar at the credit rate and import later at the retail rate
• With storage: You store excess solar and use it later, avoiding both the export and the import

If export credits equal retail rates (1:1 net metering), storage provides little bill benefit — you're “storing” in the grid for free. But if export credits are 5 cents and retail rates are 15 cents, every kWh you store instead of export saves 10 cents.

Battery economics

Battery storage adds $5,000-$15,000 or more to a solar installation. The payback depends on:

• The gap between export credit value and retail import rate
• How much excess solar you generate daily
• Time-of-use rate structures (batteries can shift usage to cheap hours)
• Backup power value during outages
• Available incentives (federal tax credit applies to batteries)

In California under NEM 3.0, battery storage is nearly essential for good solar economics. In states with strong retail-rate net metering, batteries are primarily for backup power, not bill savings.

Frequently asked questions

What is net metering for solar?

Net metering is a billing arrangement where solar panel owners receive credit for excess electricity they send to the grid. When your panels produce more than you're using, the excess flows to the grid and your meter runs backward (conceptually). You receive a bill credit that offsets electricity you draw from the grid later.

How much do you get paid for net metering?

Net metering credit values vary by state and utility. With retail-rate (1:1) net metering, you receive the same rate for exports as you pay for imports — often 10-20 cents per kWh. With avoided-cost net metering, credits may be 3-8 cents per kWh. Some states use time-of-export rates where the credit depends on when you generate power.

Is net metering going away?

Net metering policies are changing but not disappearing entirely. Many states are reducing the value of credits, switching from retail-rate to avoided-cost compensation, or introducing time-of-export rates. California's NEM 3.0 significantly reduced export credits in 2023. Check your state's current policy before sizing a solar system.

Should I get batteries if net metering is changing?

Battery storage becomes more valuable when net metering credits shrink. If you're paid 5 cents per kWh for exports but pay 15 cents per kWh for imports, storing your solar power and using it later saves 10 cents per kWh versus exporting it. Run the numbers with your specific rates and credit values to determine payback.

Do I still need to pay a utility bill with net metering?

Usually yes. Most utilities charge fixed fees for grid connection, maintenance, and customer service regardless of how much solar you generate. You'll also pay for any electricity you use beyond what your solar produces and your credits cover. A fully net-zero system means your credits offset all usage charges, but fixed fees remain.