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Utility rate growth and term
Community & shared solar
Escalator rate calculator
See exactly when a rising subscription price catches up to your utility savings, and whether your net savings shrink to zero before your contract ends.
How it works
Three steps to checking the escalator
Step 1
Find the exact escalator rate in your contract
Look for a specific percentage in your subscription agreement, not just a general statement about pricing. Some contracts have no escalator at all, which you'd enter as 0%.
Step 2
Use a realistic utility growth estimate
US utility rates have risen roughly 2.5% to 4% a year on average over the last decade. Check your own utility's recent rate history for a more specific figure, or use the credit rate vs utility rate tool to confirm your starting numbers first.
Step 3
Look at the full contract term, not just year one
A savings number that looks fine in year one can shrink significantly by year 15 or 20 under the wrong escalator. Compare the result against the price lock value calculator to see what a 0% escalator would be worth instead.
Understanding the escalator effect
Why an escalator can quietly erode long-term savings
An escalator raises your subscription cost every year regardless of what the utility rate does, so if it grows faster than your utility rate, the gap between the two shrinks year by year. An 8% escalator against 3% utility rate growth can push savings negative within just a few years, turning what looked like a good deal into a losing one over the back half of a long contract, an effect that compounds even further over the full 25 year horizon some contracts run. A rooftop PPA carries the same risk under a different name, covered by the PPA escalator rate calculator.
The counterintuitive case: equal growth rates still shrink savings
It might seem like an escalator matching utility rate growth exactly would keep savings flat, but that's not quite right. The escalator compounds on your already-discounted subscription cost, while utility growth compounds on the full credit value, so even matched growth rates cause your savings to shrink over time and can eventually turn negative on a long enough contract. Check the DSIRE database for whether your state restricts escalator rates, since this is regulated in a handful of jurisdictions.
Why a 0% escalator is the simplest contract to evaluate
With no escalator, your subscription cost as a percentage of the credit value never changes, so your savings only grow as the underlying utility rate rises. This removes an entire variable from your evaluation and is generally the most subscriber-friendly structure. Check the price lock value calculator for what avoiding an escalator is actually worth in dollar terms. The utility rate increase sensitivity calculator is a useful companion check on how much of your future savings actually depends on rates rising as projected.
What to do if your contract has a concerning escalator
If this tool shows your savings crossing into negative territory before your contract ends, ask the provider directly whether the escalator is negotiable or whether a shorter contract term is available. Run the subscription savings calculator with a shorter term to see if limiting your commitment avoids the crossover point entirely. The Department of Energy's community solar basics guide recommends reviewing the full escalator schedule in your disclosure documents before signing, not estimating it from a verbal summary.
Questions
Frequently asked
A subscription price escalator is an annual percentage increase built into your contract that raises what you pay the provider each year, separate from any change in the utility's credit rate. Escalators commonly range from 0% to 2% a year, though some contracts have none at all.
Yes, if the escalator rate is high enough relative to utility rate growth, your subscription cost can eventually exceed the bill credit value, making the subscription cost more than doing nothing. An 8% escalator against 3% utility rate growth can push savings negative within just a few years.
No, somewhat counterintuitively, savings still shrink over time even when the escalator rate matches utility rate growth exactly, since the escalator compounds on your already-discounted subscription cost while utility growth compounds on the full credit value. The two don't offset as directly as they might seem to.
A 0% escalator, meaning a fixed subscription price for the full term, is the most favorable and simplest to evaluate. If a contract does include an escalator, look for one meaningfully below typical utility rate growth of 2.5% to 4% a year to keep your savings growing rather than shrinking.