Quick definition
An aggregator is the company you actually deal with when you sign up for community solar. They handle marketing, enrollment, monthly billing, and your bill credits, while a separate developer typically owns and operates the physical solar farm you're subscribed to.
Think of it like a cell phone carrier reselling network access it doesn't own the towers for. The aggregator is your point of contact, but the underlying asset belongs to someone else.
At a glance: New York's program rules use the term subscriber organization for this role, while Illinois's Shines program defines aggregator as its own distinct term, so the exact label you'll see depends on which state's community solar market you're in.
Why it matters
Community solar lets people who can't put panels on their own roof, renters, apartment dwellers, homes with too much shade, still get a share of solar power and a credit on their electric bill. The aggregator is who makes that arrangement work day to day, since the solar farm itself doesn't deal directly with hundreds or thousands of individual subscribers.
This separation matters most when something goes wrong. Say your monthly bill credit looks off, or you want to cancel your subscription. You're calling the aggregator, not the solar farm's owner or your utility. The aggregator sets your subscription size, your credit rate, your contract length, and your cancellation terms, all within the boundaries your state or province's community solar program allows, whether that's New York's rules for what NYSERDA calls a subscriber organization, or Illinois's own definition of an aggregator in its official program glossary.
It also matters when comparing offers. Two aggregators can sell subscriptions to different solar farms in the same region with meaningfully different credit rates, fees, and contract terms, even though the underlying electricity is functionally identical. The aggregator, not the farm, is usually what you're comparing when shopping for community solar. For the numbers behind Aggregator (community solar), the net billing vs net metering comparison in our Grid & Off-Grid section walks through the calculation step by step.
Where you'll see this
Before signing up with any aggregator, run their offer through the community solar eligibility checker to confirm your utility territory actually qualifies for their program.
If more than one aggregator serves your area, the community solar provider comparison tool lines up credit rates, fees, and contract terms across aggregators so you're not comparing blind. In states with a separate credit market for the renewable attributes of that power, the aggregator is often also the counterparty handling REC delivery, worth checking against the SREC market price comparison tool if that applies to your program.
This term comes up any time you're enrolling in a subscription, reading a community solar contract, or trying to figure out who to call about a billing question. Illinois's clean energy program glossary defines an aggregator in the same way, for its own community solar rules.
Frequently asked
Not usually. A separate developer typically builds and owns the physical solar farm, while the aggregator handles subscriber sign-up, billing, and customer service. Some companies do both, but it's not the norm.
The solar farm itself keeps producing power regardless, since it's usually owned separately. In most cases another aggregator takes over billing and account management, though your credit rate or contract terms could change during the transition.
It depends on your contract and your state's or province's community solar rules. Some programs let you transfer to a different aggregator for the same project, while others tie your subscription to the original aggregator for the full contract term.
Both, usually. Your utility still bills you for the electricity you actually use, while the aggregator bills you separately for your community solar subscription and applies the bill credit your utility issues.