Fixed vs. Variable Rate Electricity Plans: Which Should You Choose?

When you shop for electricity in a deregulated state, you’ll face one critical decision before anything else: fixed rate or variable rate? The wrong choice can cost you hundreds of dollars. Here’s the definitive breakdown.

What Is a Fixed Rate Electricity Plan?

A fixed rate plan locks in your electricity price (in cents per kWh) for the full length of your contract — typically 6, 12, or 24 months. No matter what happens to wholesale electricity markets, your rate stays the same.

Example: You sign a 12-month fixed plan at 11.5¢/kWh in February. Even if wholesale electricity prices spike to the equivalent of 18¢/kWh during July’s heat wave, you still pay 11.5¢. Your cost only changes if your usage changes.

Pros of fixed rate:

• Price certainty — you know exactly what you’ll pay per kWh each month
• Protection against market spikes (summer heat waves, winter polar vortex events)
• Easier budgeting
• Usually cheaper over a full year than variable rates

Cons of fixed rate:

• If wholesale rates drop, you’re locked into your higher rate
• Early termination fees ($25–$150+) apply if you switch or move mid-contract
• Requires active management at renewal to avoid rolling onto a high variable rate

What Is a Variable Rate Electricity Plan?

A variable rate plan fluctuates month to month based on wholesale electricity market conditions. Your supplier typically adjusts the rate once per month.

Example: Your variable rate in January is 9.8¢/kWh (cheap, low demand). By July, it’s climbed to 16.2¢/kWh (heat wave, peak grid demand). By September, it drops back to 10.5¢/kWh.

Pros of variable rate:

• Can be cheaper than fixed in mild weather months
• No cancellation fee — you can switch anytime
• Benefits when wholesale prices fall

Cons of variable rate:

• Unpredictable bills — can spike dramatically during high-demand periods
• In Texas (February 2021 winter storm), some variable customers paid hundreds of dollars per kWh during the storm
• Requires active monitoring to catch rate spikes before they hit your bill
• Over a full year, usually ends up costing more than a well-timed fixed rate

The Historical Case for Fixed Rates

The data consistently shows that over a 12-month period, fixed rate customers pay less on average than variable rate customers. Here’s why:

1. Suppliers hedge variable rate risk — they buy wholesale power in advance for fixed customers at favorable prices
2. Variable rates include a risk premium — when rates spike, customers bear 100% of the cost
3. Behavioral tax — variable rate customers often procrastinate switching when rates rise, overpaying for multiple months

Texas: A Case Study in Variable Rate Risk

The February 2021 Texas winter storm (Uri) is the most dramatic example of variable rate risk. During the storm, ERCOT wholesale prices hit the regulated cap of $9.00/kWh — versus a normal February rate of $0.08–0.12/kWh.

Customers on variable rate pass-through plans received bills of $1,000–$5,000 for a single month. Customers on fixed rates paid their normal $80–150 monthly bill.

When Variable Rate Makes Sense

Variable rates aren’t always wrong. Here’s when they can work:

You’re a disciplined rate watcher. If you check your supplier’s upcoming rate and switch to a fixed plan when you see a coming spike, you can capture the benefits of both worlds.

Month-to-month flexibility. If you’re moving soon, don’t want a long-term contract, or want to re-shop frequently, a variable rate plan with no cancellation fee is a reasonable short-term choice.

Low-usage households. If you use very little electricity (under 300 kWh/month), even a sharp variable rate spike results in a small absolute dollar impact.

Our Recommendation

For most households, a 12-month fixed rate plan is the right choice. Here’s why:

• Price certainty makes budgeting predictable
• You’re protected against the most common rate-spike scenarios (summer heat waves and winter cold snaps)
• The spread between a good fixed rate and the average variable rate over 12 months is typically close to zero or in fixed’s favor
• Cancellation fees are a real cost but manageable if you plan your switching

For the rate shopper who re-shops every 6–12 months: A 6-month fixed rate can be an excellent strategy. Lock in for 6 months, re-shop before renewal, and repeat. You never face a variable spike and you’re always close to market rates.

How to Evaluate a Fixed Rate Offer

When comparing fixed rate offers, look beyond the advertised rate:

1. All-in rate at your usage level — use the Electricity Facts Label (Texas) or supplier contract summary to see the effective rate at 500 kWh, 1,000 kWh, and 2,000 kWh
2. Cancellation fee — how much to exit early? Is it flat or prorated?
3. Auto-renewal terms — what rate do you roll to if you don’t cancel before the end date?
4. Renewal notice period — how many days advance notice do they give you before auto-renewal?

Enter your ZIP code above to compare fixed and variable rate offers available in your area right now.