When you install solar panels, your utility company compensates you for the excess electricity you send to the grid. The two most common compensation mechanisms are net metering and net billing. While both reduce your electricity bill, they work in fundamentally different ways. Understanding the difference is crucial for evaluating the financial viability of a solar installation. In this article, we compare net billing vs. net metering, examine real-world examples, and help you decide which policy structure benefits you more.
What Is Net Metering?
Net metering is a billing mechanism that credits solar customers for the full retail rate of electricity they export to the grid. Under net metering, your meter runs backward when you produce more power than you consume, effectively storing excess energy on the grid for later use. At the end of the billing period, you pay only for the net electricity you consumed from the grid.
For example, if your home uses 900 kWh in a month and your solar panels generate 1,000 kWh, you send 100 kWh to the grid. Under net metering, you receive a credit for those 100 kWh at the full retail rate, say $0.12 per kWh. Your net consumption is -100 kWh, meaning you owe nothing and may carry the credit forward. This one-to-one offset makes net metering highly favorable for solar owners.
Net metering policies vary by state and utility. Some states mandate net metering for certain utility types, while others have caps on enrollment. As of 2024, over 40 states have some form of net metering policy, though many are transitioning or have modified versions.
What Is Net Billing?
Net billing is a newer compensation model where exported solar energy is credited at a rate lower than the retail electricity price. Instead of a one-to-one offset, the utility buys your excess power at a predetermined “export rate” or “buyback rate,” often called a solar buyback rate. You still consume electricity from the grid when your panels aren’t producing, and you pay the full retail rate for that consumption. The two flows are tracked separately.
For instance, if your retail rate is $0.12/kWh and the export rate is $0.075/kWh, you receive only 6.25 cents per kWh you send to the grid. If you consume 900 kWh and generate 1,000 kWh, you pay for the 900 kWh at $0.12 ($108) and receive a credit of 100 kWh × $0.075 = $7.50, resulting in a net bill of $100.50. Under net metering, the same scenario would yield a bill of $0 (or a credit).
Net billing is becoming more common as utilities argue that net metering shifts costs to non-solar customers. It is also the standard in many European countries and is increasingly adopted in U.S. states like California (under NEM 3.0), Hawaii, and Arizona.
Key Differences Between Net Metering and Net Billing
The primary difference lies in the compensation rate for exported energy. Net metering credits at the full retail rate; net billing credits at a lower, often wholesale or avoided-cost rate. This has several downstream effects:
- Bill savings: Net metering typically yields higher savings because every kWh exported offsets a kWh you would have bought at retail price. Net billing reduces savings, especially for systems that export a large fraction of generation.
- Payback period: Under net metering, the payback period for a solar system is shorter. Under net billing, you may need to pair solar with battery storage to shift consumption and avoid low export rates, which increases upfront cost but can improve returns.
- Grid impact: Net metering encourages oversizing and exporting, which can strain the grid. Net billing incentivizes self-consumption and storage, aligning better with grid needs.
- Policy stability: Net metering policies have been subject to change, often grandfathering existing customers for 20 years. Net billing is newer and may be more stable in some regions, but rates can change annually.
Financial Comparison: Net Metering vs. Net Billing
To illustrate the financial impact, consider a typical residential solar system in California. Under California’s previous net metering policy (NEM 2.0), customers received full retail credit for exports. Under the new NEM 3.0, which is a form of net billing, the export rate is based on the Avoided Cost Calculator, averaging about $0.08/kWh versus a retail rate of $0.30/kWh. A 6 kW system in Los Angeles might generate 9,000 kWh/year. With 70% self-consumption, net metering would save about $2,700/year, while net billing would save roughly $2,100/year — a 22% reduction.
However, adding a battery can change the calculus. With a battery, you can store excess solar for evening use, reducing exports and increasing self-consumption to 90% or more. Under net billing, this could bring savings close to net metering levels, though the battery adds significant cost (typically $8,000–$15,000 installed). Solar payback vs. investment returns analysis shows that batteries under net billing can still yield positive returns if time-of-use rates are high.
Which Is Better for Homeowners?
The answer depends on your location, electricity rates, and consumption patterns. Here are scenarios where each policy is preferable:
Net Metering Is Better If:
- You have high retail electricity rates (e.g., $0.25/kWh or more).
- You have limited roof space and want to maximize savings per panel.
- Your utility offers full retail net metering with no caps or expiration.
- You cannot or do not want to invest in a battery.
- You have a net metering policy that grandfathers you for 20 years.
Net Billing Is Better If:
- Net metering is not available or has unfavorable terms (e.g., low cap, high demand charges).
- You are willing to invest in battery storage to increase self-consumption.
- Your utility offers a high export rate (e.g., time-of-use net billing with peak export rates).
- You want to reduce your carbon footprint by aligning consumption with solar production.
- You are in a state like California where NEM 3.0 is the only option for new customers.
For many homeowners, net metering is the clear winner in terms of simplicity and immediate savings. However, as more states adopt net billing, the optimal strategy shifts toward battery sizing for backup vs. self-consumption to maximize value.
Impact on Solar Business and Grid
Net metering has been a key driver of rooftop solar adoption, but utilities argue it leads to cost-shifting. A 2020 study by the Lawrence Berkeley National Laboratory found that net metering customers in California paid less than their share of fixed grid costs, leading to rate increases for non-solar customers. Net billing addresses this by compensating exports at a rate closer to the utility's avoided cost.
From a business perspective, net billing reduces the value proposition of solar-only systems. Solar installers in net billing states often bundle batteries to maintain customer savings. This has boosted the battery storage market. For example, in California, over 50% of new NEM 3.0 solar installations include battery storage, compared to less than 10% under NEM 2.0.
For grid operators, net billing encourages self-consumption and reduces the duck curve problem. However, it can also slow solar adoption, as the financial incentive is weaker. Policymakers must balance these factors.
How to Choose and Optimize Under Your Policy
If you are considering solar, first determine your utility's net metering or net billing policy. Check your state's regulatory website or your utility's tariff page. Key questions to ask:
- What is the export rate? (Retail, avoided cost, or something else?)
- Is there a cap on system size for net metering?
- Are there time-of-use rates that affect export credits?
- Can you add a battery later and still qualify?
- Will the policy grandfather you for a certain period?
Once you know the policy, you can model your savings using tools like the complete guide to distributed energy economics. For net billing, you may want to oversize your system slightly to account for battery charging losses. Also, consider load shifting: run appliances during the day to increase self-consumption. Under net metering, you can be more relaxed about timing.
For a detailed financial analysis, see how to calculate solar payback period. Comparing net metering vs. net billing is essentially a comparison of two compensation structures; the better one for you depends on your specific circumstances.
Conclusion
Net metering offers the best financial return for solar owners because it values exported energy at the full retail rate. However, net billing is becoming the norm in many regions, and it can still be profitable with the right system design, especially when paired with battery storage. The choice is not always yours — it depends on your utility's policy. But understanding the difference empowers you to make informed decisions about system size, battery investment, and energy usage patterns.
If you live in an area with net metering, lock in that policy if possible. If you are under net billing, focus on self-consumption and consider storage. Both policies can work, but net metering is generally better for the solar owner's bottom line.