Constellation vs Southern Federal Power: Texas Electricity Head-to-Head
Constellation offers 24 plans starting at 10.5c/kWh while Southern Federal Power has 24 plans from 8.6c/kWh across all 6 Texas TDU service areas. Here is how their rates, terms, renewable options, and fees compare.
Rate Curve Comparison
Lowest average rate across all usage levels (8.8c/kWh vs 10.5c/kWh). Consistent pricing regardless of how much electricity you use.
Shows the best available all-in rate from each provider at 500, 1,000, and 2,000 kWh usage levels. The best plan may differ at each tier.
Best Plan Per Term Length
| Term | Constellation Best Plan | Rate | Fee | Southern Federal Power Best Plan | Rate | Fee | Winner |
|---|---|---|---|---|---|---|---|
| 6 Month | Simple Switch 3EFL | 10.5c | $50 flat | Variable AdvantageEFL | 8.6c | None | Southern Federal Power |
| 12 Month | 12 Month Usage Bill Credit EFL | 11.3c | $150 flat | SoFed Better Rate - 10EFL | 11.1c | $249 flat | Southern Federal Power |
| 24 Month | 14 Month Usage Bill CreditEFL | 11.8c | $150 flat | N/A | N/A | N/A | Constellation |
| 36 Month | 36 Month Usage Bill CreditEFL | 12.8c | $150 flat | SoFed Better Rate - 36EFL | 13.4c | $249 flat | Constellation |
Plan Type Breakdown
Constellation
Southern Federal Power
Cancellation Fee Comparison
Constellation
Southern Federal Power
Renewable Energy Deep Dive
Constellation
Southern Federal Power
Full Plan Tables
Which Provider Fits You Better?
Looking for the Lowest Rate?
Better fit: Southern Federal Power
Southern Federal Power has the lower advertised rate at 8.6c/kWh (1,000 kWh usage), compared to 10.5c/kWh.
Want a Long-Term Price Lock?
Better fit: Constellation
Constellation has the better option for locking in a rate on a 24-month or longer contract.
Need Flexibility?
Better fit: Southern Federal Power
Southern Federal Power has more flexible cancellation terms, including short-term or lower-commitment plans.
These rates are based on 1,000 kWh average usage. Your actual savings depend on YOUR usage pattern.
WattTrim analyzes your real Smart Meter data to find the plan that saves you the most - across all providers, not just these two.
Always Free
Trim My BillFrequently Asked Questions
Is Constellation cheaper than Southern Federal Power?
Based on current plan data, Southern Federal Power has the lower advertised rate, offering plans starting at 8.6c/kWh compared to 10.5c/kWh from the other provider at 1,000 kWh of usage. Your actual cost depends on your usage pattern and the specific plan you choose.
Does Constellation offer renewable energy plans compared to Southern Federal Power?
Neither Constellation nor Southern Federal Power currently lists any 100% renewable plans in our tracked Texas service areas, though many standard plans include some percentage of renewable content.
What are the cancellation fees for Constellation vs Southern Federal Power?
Constellation charges $50 - $150 on its tracked plans, while Southern Federal Power charges $39 - $249 on its tracked plans. Always review the Electricity Facts Label (EFL) for the exact fee structure before enrolling.
Which provider has more plan options in Texas, Constellation or Southern Federal Power?
Constellation and Southern Federal Power currently offer a similar number of plans in the Texas service areas we track (24 vs 24).
Can I switch from Constellation to Southern Federal Power?
Yes. Texas is a deregulated electricity market, so you can switch retail electric providers at any time. If you are still under contract with your current provider, check for an early termination fee before switching. New service with either provider typically starts within 1 to 5 business days of enrollment.