Expand any existing NEM system

Using Enphase technology, you can add more solar for California homeowners 
while preserving their NEM 1.0 or NEM 2.0 status.

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In California, many homeowners on NEM 1.0 or 2.0 consume more energy than their existing solar systems produce. Relying on expensive grid energy to make up the difference means missing out on the full savings and earnings potential of a solar-powered home.

Homeowners can now expand their systems without being moved to NEM 3.0/NBT 

Existing systems can have either Enphase microinverters or another brand of inverter 

Add advanced functionality with battery backup and solar charging of electric vehicles

More capacity. More capabilities.

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Add an IQ Battery 5P


A simple way to maximize bill offset for homeowners
with high nighttime energy needs, and even add backup
for more resilience and energy independence.
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Add an IQ EV Charger


Save money by charging EVs with excess solar energy,
and use the additional production of an expansion
system to generate the extra energy needed.
Learn more

How it works

1

Identify homeowners
who produce less
than they consume

 

 

2

Determine expansion
size based on existing
production shortfall

 

 

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3

Design and install an
expansion system to
meet their needs

 

 

Available configurations

The simplest and least expensive option to add a grid-tied expansion system, with or without batteries.

NEM-expansion-Configuration1

The best option for homeowners wanting to add an expansion system with battery backup capability.

NEM-expansion-Configuration 2

NOTE: Effective November 2024, utility companies have stopped accepting NGOM for system expansions. As an alternative, use configuration 1 or 2.

NEM_1.0_2.0_expansion_config_3

                                                              See more possible sub-configurations here.

Design considerations

  • The existing and expansion systems operate independently of each other
  • Only the existing system can export to the grid for NEM 1.0/2.0 credits 
  • 100% of the energy produced by the existing system can be exported at the NEM 1.0/2.0 rate  
  • Added batteries can only be charged by the expansion system  
  • The existing system may only have batteries attached in limited situations; see configuration diagrams for details
  • Use Solargraf to easily size and design the expansion system, determine if batteries would be useful, and generate a proposal showing potential savings

Get started

Add an expansion system to access powerful savings potential and support growing energy needs.

Application filing handbook

Step-by-step instructions for submitting expansion system applications to California utilities.

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NEM 1.0/2.0 Expansion
Video

Get an introduction and overview of NEM expansion
systems from the Enphase Training Team.

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NEM 1.0/2.0 Expansion Presentation

Everything you need to know about selling, sizing, and configuring NEM expansion systems.

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Solargraf Expansion
Video

See a short orientation video to learn more about using Solargraf to design your expansion systems. 

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Solargraf Expansion
Instructions

Full details on using Solargraf to design expansion systems and generate proposals.

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