What Are Time-of-Use Rates? (And When They Actually Save You Money)

Introduction

A time-of-use plan sounds simple: use power at cheap hours, save money. But if your life happens during peak hours, that same plan can backfire.

The goal of this guide is not to sell you on TOU. It is to help you decide if it fits your schedule and your home.

We will define the terms, show who tends to save, and give you a quick math check before you switch.

The short answer (what time-of-use means)

Time-of-use (TOU) rates change the price of electricity based on when you use it. Peak hours cost more. Off-peak hours cost less.

This is possible because smart meters report usage by time block. If you are new to them, see how smart meters work.

How TOU rates work (peak, off-peak, and shoulder)

Most plans split the day into two or three buckets:

• On-peak: the most expensive hours.
• Off-peak: the cheapest hours.
• Shoulder: a middle price in between (optional).

The exact hours vary by utility and season, so always check your rate sheet.

Typical TOU windows (what many utilities use)

A common example looks like this, but yours may differ:

• On-peak: 4 PM to 9 PM on weekdays
• Off-peak: nights, early mornings, and weekends

If you are not sure where to find the hours, check the energy section of your bill and the bill breakdown guide.

Who saves money with TOU

You are a good candidate if these sound like you:

• You charge an electric vehicle overnight or can schedule charging.
• You are not home during peak hours.
• You can run laundry and dishwashing late or early.

People who can shift large loads are the ones who benefit the most.

Who loses money with TOU

You should be cautious if:

• You work from home and use AC all afternoon.
• You have medical equipment running at all hours.
• Evenings are your busiest energy time.

If peak hours are when your household is most active, a flat rate may be safer.

How to analyze your usage before switching

Do not guess. Use your actual data if your utility provides it.

1. Log into your utility portal.
2. Look for hourly or interval usage charts.
3. Check your usage during peak windows.

If your highest spikes are during peak, you will need to shift habits to benefit.

Simple math to estimate savings

Here is a quick example. Assume a flat rate of 15 cents per kWh. A TOU plan charges 30 cents during peak and 10 cents off-peak.

• If half your usage is peak, you pay more overall.
• If only 10 percent of your usage is peak, you likely save.

The key is not the average rate. It is how much of your usage lands inside the expensive window.

EV charging: the game changer

Charging an EV is one of the biggest energy loads in a home. Moving that load to off-peak hours can outweigh higher evening rates for lights, cooking, and TV.

What if you cannot shift usage?

If your schedule is fixed, your options are limited. In that case, compare a full month of interval data to a TOU rate sheet before switching.

A stable flat rate can be the lower stress option when your life is already busy.

How to switch (and switch back if needed)

Most utilities let you switch plans once per year. Some offer a trial period or bill protection in year one.

Always confirm whether there is a minimum stay period before you enroll.

Common TOU misconceptions

• "TOU automatically saves money." It only saves if you can shift usage out of peak hours.
• "All my kWh get the peak price." Only the usage in the peak window is billed at the peak rate.
• "Peak hours are the same everywhere." Hours vary by utility and season.

If you are comparing rate types, this explainer can help: fixed vs variable rates.

Frequently asked questions