Community & shared solar
Community solar 50% offset calculator
See the subscription size and savings for covering half your usage, a common middle-ground choice between a small trial subscription and a full offset.
How it works
Two steps to your 50% offset numbers
Step 1
Enter your annual usage
A 50% offset uses half of this figure as its target. Most standard programs comfortably accommodate this size, but you can confirm with the minimum subscription size tool if your usage is on the smaller side.
Step 2
Add your credit rate and discount
These determine your actual dollar savings on top of the fixed 50% offset. Compare the result against the 100% offset calculator to see the full picture of what going bigger would look like.
Understanding a 50% offset subscription
Why 50% is a common middle-ground choice
A 50% offset balances meaningful savings against a moderate subscription commitment, without the full cost exposure of a 100% offset. It's a natural choice for subscribers who want real dollar impact but aren't ready to commit their entire usage to a single provider or contract term. The DSIRE database keeps the current program details, and it is worth a look before you decide.
How the savings scale with offset size
The dollar savings from a 50% offset are roughly double what you'd see from a 25% offset at the same discount rate, and half of what a full 100% offset would deliver. The per-kWh economics don't change with offset size, only the total dollar amount does, since a larger offset simply applies the same discount to more of your usage. Confirm your effective rate stays consistent with the subscription cost per kWh tool. The Department of Energy's community solar basics guide covers the underlying credit mechanism this per-kWh consistency relies on.
When a 50% offset fits best
This level works well for subscribers who want to see a real impact on their bill without fully committing their usage to community solar, or who are pairing a subscription with a partial rooftop system that covers the other half. See the community vs rooftop solar comparison for how that pairing plays out. A rooftop system sized for a similar partial offset can be checked with the panel count for a 90% offset tool as a nearby reference point. It's also a reasonable choice if you expect your usage to grow and want headroom under a provider's maximum subscription cap.
Deciding whether to go higher
If your 50% offset savings look strong and you're comfortable with the contract terms, moving to a full offset is a straightforward next step for most providers, subject to available capacity. Run the 100% offset calculator to compare the full numbers before deciding. A grid capacity limit can also affect how much headroom is actually available, covered by the grid export cap calculator. Check the DSIRE database for your state's specific subscription cap rules too.
Questions
Frequently asked
A 50% offset is a common balance between subscription cost and savings, covering half your usage without the full commitment of a 100% offset. A 10,800 kWh household with a 10% discount and a 50% offset saves roughly $76 a year.
A 50% offset delivers roughly double the dollar savings of a 25% offset and half the savings of a 100% offset, since the discount rate applies proportionally to whatever share of your usage you subscribe to. The per-kWh rate and effective discount stay the same across all three levels.
Some subscribers choose 50% to keep their subscription cost lower, to leave room for future usage growth without exceeding a program's cap, or because a provider's available capacity doesn't support a full offset for every subscriber. There's no penalty for choosing a partial offset.
In most programs, yes, the discount percentage is the same regardless of subscription size, since it applies per kWh rather than as a flat bonus for larger subscriptions. Confirm this with your specific provider, since a small number of programs do offer size-based discount tiers.