Supplier comparison
Constellation vs Inspire Clean Energy
Constellation Energy offers a broad portfolio of fixed and variable plans across deregulated states. Inspire Clean Energy specializes in 100% renewable plans. Here's how they compare for Pennsylvania shoppers.
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Written by John Spencer
Updated May 2026
Free comparison · No credit check required · 781 plans from PA suppliers
What you're actually comparing
This comparison serves shoppers deciding between a broad-portfolio national supplier and a green energy specialist. The choice comes down to how much you value renewable energy focus versus plan diversity.
- Constellation Energy — offers multiple rate structures (fixed, variable), term lengths, and both green and conventional plans
- Inspire Clean Energy — focuses exclusively on 100% renewable plans, with a narrower but specialized offering
Both suppliers use Renewable Energy Certificates (RECs) for their green plans. RECs match your usage with renewable generation on the grid. The difference is Inspire's exclusive focus versus Constellation's broader portfolio.
Constellation Energy
Parent company
Constellation Energy Corp (independent)
Established
1999
Customers (nationwide)
2+ million
States served
16+ states
PA PUC license
Active
Green energy options
Limited
Inspire Clean Energy
Parent company
Inspire Energy Holdings
Established
2014
Customers (nationwide)
1+ million
States served
6 states
PA PUC license
Active
Green energy options
Yes
Current plans from each supplier
Fixed-rate plans (3+ months) from each supplier, sorted by rate.
Constellation Energy plans (May 2026)
Constellation Energy
What you get: A 90-day customer satisfaction guarantee that gives you the ability to cancel your contract during the 90-day period without an early termination fee.
Available in West Penn Power territory
Constellation Energy
What you get: A 90-day customer satisfaction guarantee that gives you the ability to cancel your contract during the 90-day period without an early termination fee.
Available in Penelec territory
Constellation Energy
What you get: A 90-day customer satisfaction guarantee that gives you the ability to cancel your contract during the 90-day period without an early termination fee.
Available in PECO Energy Co territory
Constellation Energy
What you get: A 90-day customer satisfaction guarantee that gives you the ability to cancel your contract during the 90-day period without an early termination fee.
Available in Penn Power territory
Constellation Energy
What you get: A 90-day customer satisfaction guarantee that gives you the ability to cancel your contract during the 90-day period without an early termination fee.
Available in PPL Electric Utilities Corp territory
Constellation's best fixed-rate plan is 12.79¢/kWh. Their PA portfolio includes 7 residential plans across 2 different term lengths.
Inspire Clean Energy plans (May 2026)100% renewable
Inspire Clean Energy
Inspire is a clean energy supplier on a mission to give consumers better options when it comes to their electricity. With our fixed-rate plan, we offer a secure rate, personalized expert support, and …
Available in PECO Energy Co territory
Inspire Clean Energy
Inspire is a clean energy supplier on a mission to give consumers better options when it comes to their electricity. With our fixed-rate plan, we offer a secure rate, personalized expert support, and …
Available in West Penn Power territory
Inspire Clean Energy
Inspire is a clean energy supplier on a mission to give consumers better options when it comes to their electricity. With our fixed-rate plan, we offer a secure rate for 12 months, personalized expert…
Available in PECO Energy Co territory
Inspire Clean Energy
Inspire is a clean energy supplier on a mission to give consumers better options when it comes to their electricity. With our fixed-rate plan, we offer a secure rate for 12 months, personalized expert…
Available in West Penn Power territory
Inspire Clean Energy
Inspire is a clean energy supplier on a mission to give consumers better options when it comes to their electricity. With our fixed-rate plan, we offer a secure rate, personalized expert support, and …
Available in Duquesne Light Co territory
Inspire's best fixed-rate plan is 10.36¢/kWh. All 14 of their PA plans are 100% renewable-backed.
Other PA suppliers may offer lower rates or different green options. This page compares these two specific suppliers — for the full picture across all PA-licensed competitive suppliers, see our Best Electricity Plans or Best Green Energy Plans page.
21 plans from these two suppliers of 781 total PA plans
How Constellation and Inspire compare
Best fixed-rate plans
Constellation
12.79¢
6-month term
Inspire (100% renewable)
10.36¢
3-month term
Renewable energy approach
Inspire Clean Energy: All plans are 100% renewable-backed through RECs. This is their entire business model — if you want renewable energy, that's all they offer.
Constellation: Offers both green and conventional plans. Their current PA portfolio has limited 100% renewable options.
The RECs work the same way for both suppliers — they match your usage with renewable generation on the grid. The difference is specialization versus diversity. Learn more about RECs →
Plan diversity
Constellation offers 7 plans with term lengths of 6 months, 8 months.
Inspire offers 14 plans with term lengths of 3 months, 12 months.
When each supplier fits better
When Constellation makes more sense
- You want to compare green and conventional options side-by-side
- You prioritize rate over renewable energy sourcing
- You want more term length options to match your needs
When Inspire makes more sense
- You're committed to 100% renewable energy — that's non-negotiable
- You prefer a supplier whose entire business is green energy
- You don't need to compare conventional options
Note: These observations reflect each supplier's current Pennsylvania plan portfolio as of May 2026. Supplier offerings change — check current plans before making a decision.
What's the same regardless of which you choose
- Your utility continues delivering electricity and handling outages
- Both are PA PUC-licensed and bound by PA consumer protection rules
- Green plans from both use Renewable Energy Certificates (RECs)
- Switching takes 1-2 billing cycles
- Neither requires a deposit for residential enrollment
See which plans are available at your address
Plan availability varies by utility territory. Enter your ZIP to see which plans are available in your area.
What to verify before enrolling
Verify the renewable energy claim
Check the Plan Information Document (PID) for REC sourcing details. Both suppliers use RECs, but sourcing (wind, solar, mix) may vary.
Understand the rate after the initial term
Both suppliers' plans roll to a higher variable rate when the fixed term ends. Set a calendar reminder 30 days before term-end.
Check the early termination fee
ETFs typically range $50-$200. Verify the specific amount before signing.
Verify PA PUC license status
Both suppliers hold active PA PUC licenses. Verify at puc.pa.gov.
Frequently asked questions
Is Inspire Clean Energy actually greener than Constellation's green plans?
Both use Renewable Energy Certificates (RECs) to match your usage with renewable generation. Inspire's entire portfolio is 100% renewable-backed, while Constellation offers both green and conventional plans. The RECs themselves work the same way — the difference is Inspire's exclusive focus on renewable options.
Should I choose a green-only supplier or a supplier with both green and conventional plans?
If you're committed to renewable energy and want a supplier whose business model aligns with that, Inspire's specialization may appeal. If you want to compare green and conventional options from one supplier, Constellation's broader portfolio gives you more choices. Neither approach is objectively better.
How does Inspire's pricing compare to Constellation's?
Current lowest fixed rates: Constellation 12.79¢/kWh, Inspire 10.36¢/kWh. Inspire's 100% renewable plans may carry a premium, but this varies by market conditions and promotional periods.
Does choosing a green supplier change my utility service?
No. Your utility (PECO, PPL, Duquesne Light, etc.) continues delivering electricity regardless of supplier. The same electrons flow to your home — the difference is how the supplier accounts for your usage through RECs.
Which supplier has more plan options?
Constellation currently offers 7 plans in PA; Inspire offers 14. Constellation's broader portfolio includes multiple rate structures and term lengths. Inspire focuses specifically on renewable plans.
Related resources
Plan data sourced from PA Power Switch and updated weekly. Supplier metadata from public corporate records. Read our methodology →
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Free comparison · No credit check required · 781 plans available