Fixed vs. Variable Electricity Rates
Compare fixed-rate supply plans vs. variable market electricity contracts, contract renewal terms, cancellation fees, and retail choice options.
Key Takeaways & Core Facts
- Fixed-rate supply plans lock in a constant cost per kWh for the duration of a contract (typically 12 to 36 months).
- Variable-rate supply plans fluctuate monthly based on wholesale energy market prices, weather conditions, and utility adjustments.
- Delivery charges (utility distribution fees) remain separate and are regulated regardless of whether you choose a fixed or variable supply rate.
Direct Answer: Fixed vs. Variable Electricity Rates
A Fixed-Rate electricity contract locks in a constant supply price per kilowatt-hour ($/kWh) for a set term (typically 12, 24, or 36 months), protecting households from energy market price spikes.
A Variable-Rate electricity plan fluctuates monthly based on wholesale energy market conditions, weather events, and supplier pricing adjustments—offering flexibility without long-term contracts but exposing consumers to price volatility.
Supply Choice, Delivery Charges & Contract Terms
In deregulated retail electricity markets (such as Texas, Pennsylvania, Ohio, or Illinois), consumers can choose their retail energy supplier. Understanding fixed vs. variable contracts requires separating supply terms from utility distribution:
- Supply vs. Delivery Charges: Supply rate contracts govern only the generation portion of your bill. Regulated utility delivery (distribution) charges remain separate regardless of plan choice.
- Contract Term & Renewal Rules: Fixed-rate contracts expire after 12 to 36 months. If not renewed or switched, plans often auto-enroll into high variable default rates.
- Introductory Teaser Pricing: Some variable plans advertise very low initial 1-month rates that automatically spike after the introductory promo period expires.
- Early Termination Fees (ETF): Fixed contracts may charge an early exit fee ($50–$150) if canceled prior to contract expiration.
Fixed vs. Variable Supply Cost Comparison
| Plan Type | Contract Term | Price Stability | Sample Summer Cost (15¢/kWh) | Sample Winter Spike (25¢/kWh) |
|---|---|---|---|---|
| Fixed-Rate Contract | 12–24 Months | 100% Guaranteed Rate | $150.00 | $150.00 (Protected) |
| Variable Market Rate | Month-to-Month | Fluctuates Monthly | $130.00 (Off-Peak Market) | $250.00 (Market Spike) |
| Utility Default Service (Standard) | 6–12 Month Regulated Tariff | Semi-Annual Adjustment | $145.00 | $160.00 |
* Note: Contract terms, termination fees, and wholesale market price fluctuations vary by state retail choice regulations and energy supplier terms. Figures represent illustrative calculation assumptions.
Assumptions & Contract Review Guidance
Neither plan type is universally superior for every consumer. Fixed rates provide budget predictability, while variable rates offer no-penalty exit flexibility. Always review contract terms carefully; this guide provides general consumer education and does not constitute legal or financial advisory advice.
Analyze supply contract rates with our Electricity Bill Analyzer or learn more in our Supply vs. Delivery Charge Guide or rate increase guide: Why Electricity Rates Change.
Electricity Bill Analyzer
Evaluate supply contract options by calculating bill impacts across fixed and variable rate scenarios.
Analyze Rate Plans →Government & Official Data Sources
- Federal Trade Commission — Shopping for Competitive Retail Electricity Contracts (Retail choice, fixed vs variable supply plans, early termination fees, and contract terms)
- U.S. Energy Information Administration — Retail Electricity Electricity Market Restructuring & Pricing (Competitive supply markets, price volatility, and default utility service rates)