What is Net Metering for Solar?

Solar for Homeowners | 8 min read
How Net Metering Works

Net metering is a method used by many utility companies to compensate you for the overproduction of electricity (kWh) generated in a given period by your solar system.

Net metering technically is not “selling” your solar-generated electricity to the utility company. Instead of money, you’re compensated with electricity credits which you can then use to supplement your electricity bill. 

How Does Net Metering Work?

On sunny days, your solar system produces energy. Some of that energy is used immediately by your home, farm, or business. However, depending on your electricity usage and your system’s production, it can create more electricity than you use during those sunny hours. 

On grid-tied systems, that excess electricity is pushed out through your electricity meter and to the utility grid. In return, the utility will give you a one-for-one credit for the electricity you “uploaded” to the grid.

When you use electricity while your solar system is not producing, like at night, you’ll draw electricity from the utility company. Instead of having to pay for that electricity, you can draw on those credits to “net” out your meter.

What’s so great about it? Net metering typically requires utility companies to credit you with the retail rate for your electricity, which is the rate you pay to buy electricity. This makes it easier to offset more power with solar energy. It essentially uses the electricity grid as a form of free energy storage. That way, you can have access to free electricity generated by your solar system 100% of the time, regardless of how brightly the sun is shining.


Virtual Net Metering

Also known as meter aggregation, virtual net metering is a program for solar owners who have more than one electricity meter within a short distance (usually around 2 miles) of one another.

Virtual net metering allows solar owners to aggregate their net metering credits and apply them to multiple meters. That means if you have more than one meter, you can potentially offset your total electricity usage from all meters with just one solar energy system.

The other solution would be to install a solar system at each meter. However, installing two smaller systems is typically less cost-effective than installing one large system. In most cases, it’ll be less expensive to install one large solar system that can meet the electricity needs of all your meters as opposed to two systems connected to each meter.

However, not all states and utilities allow virtual net metering.

How Does Your State Compensate You For Solar Energy Production?

While net metering is mandated for public utilities in many states, it’s not the case in all states. Additionally, some electricity co-ops and smaller utilities may not offer net metering, even if you live in a state that has net metering

System capacity limits, extra credit compensation, and virtual net metering or meter aggregation policies all vary from state to state and from each utility company. Some states, like New York, are slowly phasing out net metering in favor of newer compensation methods.

We’ll take a look at how each state measures up when it comes to compensating you for your solar-generated electricity. 

Delaware Net Metering Rules

Delaware requires all its electric utility companies to provide net metering for solar producers. However, there are some limits on the amount of electricity you can produce with a grid-tied system.

Overall, your solar system’s capacity cannot exceed 110% of your 12-month historical energy consumption. That means if you used 10,000 kilowatt-hours (kWh) of electricity last year, your solar system can only generate 11,000 kWh. 

After a year of collecting and using net metering credits, you’ll be able to roll over unused credits to the next year. Your other option is to sell the credits at the avoided-cost rate. Note that the avoided cost rate is less than the one-to-one retail rate associated with net metering. 

Delaware utilities also allow for meter aggregation or virtual net metering, which can help if your property has multiple electricity meters. However, there are some specific criteria you may have to meet to qualify.

Maryland Net Metering Rules

Maryland utility companies are required to compensate solar producers at the retail rate for any solar-produced electricity uploaded to the grid through net metering. That means Maryland solar owners get a one-to-one exchange for the electricity they upload to and pull off the grid.

However, grid-tied solar systems cannot exceed 200% of the owner’s annual electricity usage. That means if you use 10,000 kWh annually, your solar system’s annual production capacity can’t exceed 20,000 kWh.

If you have unused credits at the end of the year, the utility company will compensate you at the avoided cost rate. Note that this is less than the retail rate on which the net metering credits are based on. 

Virtual net metering and meter aggregation are allowed for certain solar systems. This includes agricultural customers, non-profit organizations, municipal governments, or affiliates.

New Jersey Net Metering Rules

New Jersey requires all their utilities to comply with net metering. That means they’ll compensate solar owners for excess electricity uploaded to the grid at the one-to-one retail rate. 

However, to connect your system to the grid and benefit from net metering, its annual production cannot exceed 100% of your annual electricity usage. 

Should you end up with excess credits at the end of an annualized period, you’ll be compensated at the wholesale electricity rate, which is less than the retail price that’s reflected in your net metering credits.

New Jersey only allows meter aggregation or virtual net metering for solar systems that offset electricity for public entities, like state and local governments, local agencies, and school districts. 

New York Net Metering Rules

New York previously required utilities to provide net metering to all homes and businesses with a grid-tied solar system. However, they began transitioning into a new compensation plan in recent years. Known as the VDER Value Stack, it recognizes that solar-generated electricity's value differs from traditional utility electricity.

If the VDER value stack is your compensation method, you won’t be credited with the retail rate of electricity as you would with net metering. Instead, you’ll be credited at the Value Stack Tariff rate. 

This variable rate increases and decreases based on various factors, including the time the electricity is produced, where the electricity is produced, and how much other solar energy is being produced in that area at that time. 

For many residential customers, this rate tends to be lower than what it would be with net metering.  For many commercial customers, the VDER value stack rate can be higher than the retail rate.


Until 2022, residential solar owners can choose between net metering and the VDER Value Stack Tariff. Large commercial systems, however, will have to use the Value Stack program.

After 2022, New York solar owners can still opt for net metering. However, they’ll have to pay a Customer Benefits Charge (CBC). This is to ensure that solar owners help to pay part of the loss incurred by the utility because of net metering instead of placing the entire financial burden on those who do not own solar. 

Excess credits for non-residential solar producers can be carried over indefinitely for solar owners who are grandfathered into net metering. Excess credits from residential producers will be compensated based on the generation rate, which is less than the retail rate associated with the net metering credit. 

All that said, the VDER Value Stack Tariff compensation method or the CBC will not significantly impact the financial return of solar investments in New York.  

Solar generating capacity is capped at 25 kW for residential, 100 kW for farmers, and 2 MW for non-residential.

Meter aggregation or virtual net metering is allowed for non-residential or agricultural systems, assuming they meet the specific requirements. 

Ohio Net Metering Rules

Public utility companies in Ohio are required to offer a form of net metering to their customers who generate solar electricity.  However, most public utilities will not credit any overproduction from solar in the course of a month at the retail rate but rather at the wholesale rate.  That means for each excess kWh of solar-generated, the system owners will not receive a credit one-for-one to draw off the grid.  This is known as Net Billing

Any solar system that produces more than 100% of a customer's load in the course of a year will be liable to lose net metering status altogether.  For this reason, a solar system should be sized at no more than 95% of a customer’s annual usage.

Many utility Cooperatives in Ohio offer no form of net metering, making it difficult for some customers to realize the benefits of solar.   

Ohio net metering regulations do not address virtual net metering or meter aggregation, meaning this will vary from case to case and from utility to utility. 

Pennsylvania Net Metering Rules

Pennsylvania requires its utility companies to offer net metering to the owners of solar systems. That means excess electricity produced by a grid-tied system will be compensated by a credit equal to the retail rate for that amount of electricity. 

Pennsylvania sets a cap for grid-tied systems, though it varies depending on the type of system installed. Residential solar systems cannot exceed 50 kW. Non-residential systems cannot exceed 3 megawatts (MW). Microgrid and emergency systems are capped at 5 MW. 

Should you end up with additional credits, you can roll them over from month to month. However, after the year-end (which typically is June), depending on your Utility, you may be compensated for remaining credits at the wholesale rate or the retail rate  Some Utilities such as PPL will even pay you in the form of a check for excess kWh generated over the course of a year and pays the “price to compare” on your PPL electric statement.  

Pennsylvania does allow virtual net metering and meter aggregation, meaning if you have more than one electricity meter, you can reap the benefits of net metering even if you only have one solar system connected to one of your meters. To virtual net meter, the properties must be in the same utility grid zone and within 2 miles of each other, and the billing account must be in the same name.

Virginia Net Metering Rules

Virginia mandates that their utility companies offer solar owners net metering. This means grid-tied solar energy systems will be compensated at the retail rate for the excess generation. This makes it easier for Virginian businesses, farms, and homes to offset their utility bill with clean energy. 

To connect to the grid and benefit from their net metering program, systems need to comply with the state’s system capacity limit. Residential systems can’t exceed 20 kW. 

Non-residential systems are limited to 1,000 kW or 1 MW. Agricultural systems max out at 500 kW. And no solar panel systems can exceed 100% of the customer’s annual electricity usage.

Should you end up with additional credits at the end of the year, you have two options. You can indefinitely roll these net metering credits over to the next billing cycle. Or, you can opt for the pay-out option.

The utility will compensate you for each kWh credit at the avoided cost rate in the latter option. This is less than the retail rate that’s reflected when trading a credit directly for electricity. 

Meter aggregation or virtual net metering is allowed for farms with solar and for school districts. This means you’re able to offset multiple meters with your solar-generated electricity even if the solar system isn’t connected to all of your meters. 

West Virginia Net Metering Rule

West Virginia requires its utility companies to offer net energy metering to solar systems located in the state. That means if your grid-tied solar energy system produces excess electricity and uploads it to the grid, you’ll receive credit. That credit will be equal to the retail cost of electricity, so you can substitute it one-for-one for any electricity you need to draw from the grid. 

For your solar system to be eligible, it must comply with West Virginia’s system capacity limits, which vary with customer type and utility. 

All residential systems are limited to 25 kW in capacity. For commercial solar systems connected to an investor-owned utility (IOU) that has more than 30,000 customers, their system is limited to 500 kW. Industrial systems connected to IOUs with over 30,000 customers can have a capacity of up to 2 MW. 

If the commercial or industrial solar system is connected to an IOU with fewer than 30,000 customers, the limit is 50 kW.

Excess credits can roll over from one monthly billing period to the next. However, there is no annual rollover, and credits cannot be sold, even for the lesser generation rate. 

Virtual net metering and meter aggregation is allowed in West Virginia, allowing solar owners with multiple electricity meters to offset their electrical needs with just one solar system.

What If My State Does Away With Net Metering?

The regulatory outlook for net metering remains positive, as states are doing all they can to encourage residents and businesses to switch to renewable energy. However, as we’ve seen with New York, states are adjusting it to ensure non-solar owners aren’t paying more to offset the costs. 

In short, just because net metering is a policy now doesn’t mean that will always be the case.

Should your state do away with net metering, history suggests you’ll likely be grandfathered into the policy. As long as you install your solar system while net metering is a policy, that should stay true for your system for its entire life. However, we can not 100% guarantee that will be the case. 

This is just one of several reasons why you shouldn’t wait to go solar. Install your system while net metering is a policy in your state, and take advantage of it for the decades-long lifespan of your solar system.

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