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EXPANDING YOUR SOLAR SYSTEM WITH 'NON-EXPORT'
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In years past, expanding your solar system was easy and practical. Net metering rules were simple and straightforward. You could add panels and expand your system by 50 percent, in some cases much more. Filing new utility paperwork was painless and your solar home maintained its 20-year NEM contract with the utility. That all went out the window in 2023 when NEM 3 came around and clapped back at NEM 1 and NEM 2 homes. No longer would utilities allow homeowners to expand their solar systems so easily. Instead, they thwarted meaningful system expansions by capping additions at just 1 kW or 10 percent of the existing system. That’s the equivalent of adding only two extra panels, which for most homes barely makes a dent in an annual True-Up bill. Utilities also layered in a consequence. Expand beyond that threshold and it triggers a release clause. That clause gives the utility the right to back out of your 20-year NEM agreement and lump your legacy system and new system together, forcing everything under NEM 3.
Homeowners found themselves stuck. They needed more energy but couldn’t add a meaningful amount of solar without destroying the very NEM agreement that made going solar so attractive in the first place. That’s when Non-Export systems entered into the conversation and became the pressure-release valve.
We truly have the California Solar & Storage Association (CALSSA) and other CA solar advocates to thank, because they took this issue straight to the California Public Utilities Commission and made a common-sense argument.
At the heart of their argument was a simple idea: If a properly designed system doesn’t send power back to the grid, doesn’t stress transformers, and doesn’t require new grid management, then in the utility’s eyes it should simply look like a reduced on-site load. Basically, a solar home should be allowed to expand its solar footprint without penalty.
CALSSA hammered these points home repeatedly, arguing that Non-Export systems should be recognized as a legitimate configuration and given a streamlined, fast-tracked interconnection pathway, without utilities using a system expansion as an excuse to blow up a homeowner’s existing NEM agreement. That advocacy paid off, and today solar homes throughout PG&E, SCE, and SDG&E territory can expand their solar system while preserving their current NEM rate plans.
How does Non-Export Work?
When a Non-Export solar expansion is paired with battery storage, any extra solar kilowatt-hours produced by the new system do not flow back to the grid. This is an important concept to grasp. The utility does not want, nor will it accept any of your new system’s excess solar generation. 100% of your new energy must be consumed on-site.
First, your original solar system, in conjunction with your new solar panels, powers your home in real time. When your home’s energy needs are met, the surplus energy from the new panels is funneled to the battery, in preparation to discharge kilowatt-hours for evening and nighttime usage. Meanwhile, your legacy system is freed up to export its extra kilowatt-hours under its original and favorable NEM 1 or NEM 2 rates.
At the heart of your Non-Export system is a PCS device. The PCS, or Power Control System, continuously monitors how much power your solar system is producing and dynamically throttles inverter output to prevent exporting. Its sole job is to keep grid flow from the new panels at zero kilowatt-hours. Once installed and configured properly, it quietly does its job in the background.
You might be wondering how Non-Export appears on your monthly statement or if it changes your True-Up cycle in any way. It does not. You keep your 20-year NEM agreement and your annual billing cycle. Your True-Up month stays exactly where it’s always been.
Why Batteries Are Required for Non-Export
Without the ability to export excess solar power to the grid, that energy must go somewhere. That somewhere is your battery. Without a battery, your PCS device kicks in and your newly installed panels shut down and are rendered useless. Your Non-Export panels, paired with a battery, offset the expensive kilowatt-hours you would otherwise import from the grid during on-peak rates and well into the night. The bonus is that you now have backup battery storage available, providing a layer of grid resilience. Instead of feeling like you’re being forced into a battery, I look at it this way. You’re finally installing the missing piece that makes solar work when the grid does not.
How Non-Export Shrinks Your True-Up Bill
This is where things get interesting. With your Non-Export system in place, you can cover EV charging, handle more of your daytime loads, and power nighttime usage through battery storage. This in turn means your legacy solar system is suddenly freed up. Those original panels are no longer struggling to keep up with your home’s growing energy demands. Instead, they’re liberated to send more daily kilowatt-hours back to the grid during daylight hours, maximizing NEM credits.
That’s where the magic happens, as hundreds to thousands of kilowatt-hours per year are freed up to export to the grid under favorable NEM rates, significantly reducing a homeowner’s annual True-Up bill, and in some cases bringing it all the way back to zero.
New Construction Homes, Pay Attention
If you bought a new construction home in the last several years, this applies to you. California mandates rooftop solar on all new homes, but it does not require those systems to be sized realistically. Builders are allowed to install minimum-compliance systems, often no more than eight to ten panels, and they rarely include a battery. I routinely hear from new construction homeowners whose very first True-Up bill comes in well over $3,000. In these cases, Non-Export systems paired with battery storage are the cleanest and most effective remedy.
Does Non-Export Pencil Out?
That depends. Adding solar and battery storage is a significant investment. Battery pricing sometimes causes sticker shock for homeowners who have never priced it out before. Realistically, if your annual True-Up bill is under $2,000, a Non-Export system may not pencil out. Below that threshold, the payback can be long. But once your True-Up approaches, or exceeds that range, or you expect your energy usage to increase, and you value the comfort and reliability of battery backup, then a Non-Export system deserves a serious look.
NEM 1 Homes, the Clock Is Ticking
If you are on NEM 1, the clock is ticking. Your 20-year agreement may be nearing its end. When it expires, your system will be transitioned to NEM 3 whether you like it or not. When that happens, your solar export credits drop dramatically, and batteries will become a necessity for your home. Futureproofing now by adding a Non-Export system with battery storage prepares your home before that flip to NEM 3 happens.
What’s the Process Looks Like?
Installing these types of solar configurations alongside legacy systems is far more complex than a standard solar project. It requires experienced engineers designing accurate plan sets and interconnection teams who understand how Non-Export systems are reviewed and approved by the utility. Installers must know how to commission the system properly, so it remains compliant with your existing NEM contract.
Accurate sales modeling is imperative. Make sure the company you choose is experienced and well-versed in Non-Export systems. Not all companies are willing or able to do this work. Engineering, interconnection, and commissioning all need to be precise. When it all comes together, Non-Export becomes one of the most powerful tools homeowners have to regain control of their energy future and lower their True-Up bills.
Used correctly, Non-Export turns a system expansion that utilities tried to curb into both a homeowner advantage and a hard-earned victory for rooftop solar.
Homeowners found themselves stuck. They needed more energy but couldn’t add a meaningful amount of solar without destroying the very NEM agreement that made going solar so attractive in the first place. That’s when Non-Export systems entered into the conversation and became the pressure-release valve.
We truly have the California Solar & Storage Association (CALSSA) and other CA solar advocates to thank, because they took this issue straight to the California Public Utilities Commission and made a common-sense argument.
At the heart of their argument was a simple idea: If a properly designed system doesn’t send power back to the grid, doesn’t stress transformers, and doesn’t require new grid management, then in the utility’s eyes it should simply look like a reduced on-site load. Basically, a solar home should be allowed to expand its solar footprint without penalty.
CALSSA hammered these points home repeatedly, arguing that Non-Export systems should be recognized as a legitimate configuration and given a streamlined, fast-tracked interconnection pathway, without utilities using a system expansion as an excuse to blow up a homeowner’s existing NEM agreement. That advocacy paid off, and today solar homes throughout PG&E, SCE, and SDG&E territory can expand their solar system while preserving their current NEM rate plans.
How does Non-Export Work?
When a Non-Export solar expansion is paired with battery storage, any extra solar kilowatt-hours produced by the new system do not flow back to the grid. This is an important concept to grasp. The utility does not want, nor will it accept any of your new system’s excess solar generation. 100% of your new energy must be consumed on-site.
First, your original solar system, in conjunction with your new solar panels, powers your home in real time. When your home’s energy needs are met, the surplus energy from the new panels is funneled to the battery, in preparation to discharge kilowatt-hours for evening and nighttime usage. Meanwhile, your legacy system is freed up to export its extra kilowatt-hours under its original and favorable NEM 1 or NEM 2 rates.
At the heart of your Non-Export system is a PCS device. The PCS, or Power Control System, continuously monitors how much power your solar system is producing and dynamically throttles inverter output to prevent exporting. Its sole job is to keep grid flow from the new panels at zero kilowatt-hours. Once installed and configured properly, it quietly does its job in the background.
You might be wondering how Non-Export appears on your monthly statement or if it changes your True-Up cycle in any way. It does not. You keep your 20-year NEM agreement and your annual billing cycle. Your True-Up month stays exactly where it’s always been.
Why Batteries Are Required for Non-Export
Without the ability to export excess solar power to the grid, that energy must go somewhere. That somewhere is your battery. Without a battery, your PCS device kicks in and your newly installed panels shut down and are rendered useless. Your Non-Export panels, paired with a battery, offset the expensive kilowatt-hours you would otherwise import from the grid during on-peak rates and well into the night. The bonus is that you now have backup battery storage available, providing a layer of grid resilience. Instead of feeling like you’re being forced into a battery, I look at it this way. You’re finally installing the missing piece that makes solar work when the grid does not.
How Non-Export Shrinks Your True-Up Bill
This is where things get interesting. With your Non-Export system in place, you can cover EV charging, handle more of your daytime loads, and power nighttime usage through battery storage. This in turn means your legacy solar system is suddenly freed up. Those original panels are no longer struggling to keep up with your home’s growing energy demands. Instead, they’re liberated to send more daily kilowatt-hours back to the grid during daylight hours, maximizing NEM credits.
That’s where the magic happens, as hundreds to thousands of kilowatt-hours per year are freed up to export to the grid under favorable NEM rates, significantly reducing a homeowner’s annual True-Up bill, and in some cases bringing it all the way back to zero.
New Construction Homes, Pay Attention
If you bought a new construction home in the last several years, this applies to you. California mandates rooftop solar on all new homes, but it does not require those systems to be sized realistically. Builders are allowed to install minimum-compliance systems, often no more than eight to ten panels, and they rarely include a battery. I routinely hear from new construction homeowners whose very first True-Up bill comes in well over $3,000. In these cases, Non-Export systems paired with battery storage are the cleanest and most effective remedy.
Does Non-Export Pencil Out?
That depends. Adding solar and battery storage is a significant investment. Battery pricing sometimes causes sticker shock for homeowners who have never priced it out before. Realistically, if your annual True-Up bill is under $2,000, a Non-Export system may not pencil out. Below that threshold, the payback can be long. But once your True-Up approaches, or exceeds that range, or you expect your energy usage to increase, and you value the comfort and reliability of battery backup, then a Non-Export system deserves a serious look.
NEM 1 Homes, the Clock Is Ticking
If you are on NEM 1, the clock is ticking. Your 20-year agreement may be nearing its end. When it expires, your system will be transitioned to NEM 3 whether you like it or not. When that happens, your solar export credits drop dramatically, and batteries will become a necessity for your home. Futureproofing now by adding a Non-Export system with battery storage prepares your home before that flip to NEM 3 happens.
What’s the Process Looks Like?
Installing these types of solar configurations alongside legacy systems is far more complex than a standard solar project. It requires experienced engineers designing accurate plan sets and interconnection teams who understand how Non-Export systems are reviewed and approved by the utility. Installers must know how to commission the system properly, so it remains compliant with your existing NEM contract.
Accurate sales modeling is imperative. Make sure the company you choose is experienced and well-versed in Non-Export systems. Not all companies are willing or able to do this work. Engineering, interconnection, and commissioning all need to be precise. When it all comes together, Non-Export becomes one of the most powerful tools homeowners have to regain control of their energy future and lower their True-Up bills.
Used correctly, Non-Export turns a system expansion that utilities tried to curb into both a homeowner advantage and a hard-earned victory for rooftop solar.