Your numbers
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Usage and utility rate
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Community solar terms
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PPA terms
Community & shared solar
Community solar vs PPA comparison
Compare community solar's bill credit savings against a rooftop PPA's direct per-kWh rate, two structurally different paths to solar savings.
How it works
Two steps to your comparison
Step 1
Get real terms for both options
Pull your community solar credit rate and discount from an actual offer, and your PPA rate and escalator from a real installer proposal. Check the community vs rooftop solar comparison for the broader ownership-based decision this connects to.
Step 2
Confirm whether a PPA is even available to you
A PPA requires homeownership and a roof suited to solar, so confirm this option is actually on the table before comparing. If it isn't, community solar remains available regardless, and the savings vs installed solar tool can help with that fallback comparison.
Understanding community solar vs a PPA
Why the two structures produce different savings from similar rates
Community solar applies a discount to a separate bill credit rate, which is itself only loosely tied to your utility rate, adding a layer between the two figures. A PPA rate instead directly replaces your utility rate at the agreed per-kWh price, without that extra conversion step. This structural difference is often why a PPA can produce stronger savings even when the headline discount percentages look similar. The PPA cost calculator breaks down this per-kWh rate in more detail if you want to run your own numbers.
What you give up for a PPA's typically stronger savings
A PPA requires panels physically installed on your roof, so it comes with all the same requirements as owned rooftop solar: homeownership, a suitable roof, and a long-term tie to that specific property. Community solar avoids every one of these constraints since the array is offsite and unconnected to your home, making it accessible to renters and anyone without a solar-friendly roof. Check the vs installed payback crossover calculator for how rooftop ownership compares over a longer horizon. Check the DSIRE database for state-specific PPA regulations too, since a small number of states restrict or prohibit third-party PPAs entirely.
Why a PPA's own escalator matters just as much as community solar's
Most PPAs include an annual price escalator on the per-kWh rate, similar in concept to a community solar subscription escalator, and it should be factored into any long-term projection the same way. Check the escalator rate calculator for how this same mechanic plays out on the community solar side if you want a deeper look at that specific effect. The savings comparison between a loan and a PPA weighs this same escalator against a financed-purchase alternative.
Which option fits your situation
If you own a home with a suitable roof and want to maximize savings, a PPA is worth serious consideration alongside outright ownership. If you rent, your roof isn't suitable, or you simply want to avoid a long-term tie to your specific property, community solar remains the more flexible and accessible path. Use the ownership vs subscription comparison tool for the closely related choice between owning a system outright and subscribing to one. The Department of Energy's community solar basics guide notes that roughly half of households can't host rooftop solar at all, which rules out a PPA entirely regardless of preference.
Questions
Frequently asked
A power purchase agreement, or PPA, is an arrangement where a third party installs solar panels on your roof and you agree to buy the electricity they produce at a set per-kWh rate, usually below your utility rate. Community solar instead uses an offsite shared array and applies savings as a bill credit rather than a direct kWh purchase from panels on your own property.
Yes, a PPA requires installing panels on your roof, so it generally requires homeownership and a suitable roof, the same requirements as owned rooftop solar. Community solar doesn't have this requirement, since the array is located elsewhere and doesn't involve your property at all.
A PPA rate directly replaces your utility rate at a discount, while community solar applies a discount to a separate bill credit rate, which introduces an extra layer that can reduce the effective savings. In many cases a PPA's direct per-kWh discount produces a larger overall benefit, though this depends on the specific rates offered in each arrangement.
A PPA requires a suitable roof and homeownership, ties you to your specific property for the contract term, and often includes its own annual price escalator. Community solar avoids all of these constraints since it doesn't involve your roof or property at all, making it a better fit for renters or homes unsuited to rooftop panels.