What Is Peak Shaving & Load Shifting? The Complete Guide for Australian Households

By Spiring Energy

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Last Updated JUN 25. 2026

You know that sinking feeling when you check your power bill?

Electricity prices across Australia have changed significantly in recent years. Many households are now moving to time-of-use (TOU) electricity plans, where power costs vary throughout the day. While these plans can create opportunities to save money, they can also lead to unexpectedly high bills if energy usage isn't managed carefully.

 

Two strategies that are becoming increasingly important for Australian homeowners are peak shaving and load shifting. Although these terms are often used together, they serve different purposes and can have a major impact on how much you pay for electricity.

 

In this guide, we'll explain what peak shaving and load shifting mean, how they work with solar and battery systems, and why they're becoming essential tools for reducing energy costs.

Why Electricity Timing Matters

Traditionally, many households paid a flat rate for electricity regardless of when they used it. Today, more retailers offer time-of-use tariffs, where electricity prices change depending on demand.

 

Typically, electricity is cheapest during the middle of the day when solar generation is abundant and most expensive during the evening when households return home, cook dinner, run appliances, and charge devices.

 

For example, electricity used between 5 pm and 9 pm may cost two to four times more than electricity used during off-peak periods. This means that when you use electricity can be just as important as how much you use.

 

Understanding this concept is the foundation of both peak shaving and load shifting.

What Is Peak Shaving?

Peak shaving refers to reducing the amount of electricity your home draws from the grid during high-demand, high-cost periods.

 

Rather than importing expensive electricity during the evening peak, a household uses stored energy from a battery system. As a result, grid consumption is reduced precisely when electricity prices are highest.

 

Imagine a home that normally requires 4 kW of power between 6 pm and 8 pm. Without a battery, all 4 kW would need to be purchased from the grid at peak rates. With a battery, much or all of that demand can be supplied from stored energy instead.

The benefits of peak shaving include:

  • Lower electricity bills
  • Reduced exposure to high peak rates
  • Less strain on the electricity network
  • Improved energy independence

For battery owners, peak shaving is often one of the fastest ways to increase the value of their energy system.

What Is Load Shifting?

Load shifting involves moving electricity consumption from expensive periods to cheaper periods.

 

Unlike peak shaving, load shifting does not necessarily reduce total electricity consumption. Instead, it changes when electricity is used.

 

Common examples include:

  • Charging an electric vehicle during off-peak hours
  • Running a dishwasher during the day
  • Scheduling a washing machine cycle during solar production hours
  • Heating water when electricity prices are low

For instance, if a homeowner usually charges an EV at 7 pm during peak pricing, shifting that charging session to midday or overnight can significantly reduce energy costs without changing driving habits.

 

Load shifting is one of the simplest and most effective energy-saving strategies because it often requires no additional equipment.

Peak Shaving vs Load Shifting

Although both strategies help reduce electricity bills, they achieve savings in different ways.

Peak Shaving focuses on reducing demand during expensive periods.

Load Shifting focuses on moving energy consumption to cheaper periods.

Peak shaving often relies on battery storage, while load shifting can be achieved through behavioural changes, smart appliances, or automated energy management systems.

 

The most effective households typically combine both strategies. They shift flexible loads to cheaper periods and use batteries to reduce remaining peak-hour consumption.

How Home Batteries Enable Both Strategies

Home battery systems play a unique role because they support both peak shaving and load shifting simultaneously.

 

During the day, excess solar energy can be stored instead of being exported to the grid. Later, that energy can be used during the evening peak period.

 

Similarly, batteries can charge when electricity prices are low and discharge when prices are high. This effectively shifts energy consumption across different periods of the day.

 

For households with solar systems, batteries transform excess daytime generation into usable evening energy. Instead of selling electricity at a relatively low feed-in tariff and buying it back later at a much higher rate, homeowners can store and use their own energy when it is most valuable.

The Rise of Free Electricity Plans in Australia

A growing number of Australian electricity retailers now offer plans that include free electricity periods during specific hours of the day.

 

These plans are designed to encourage electricity usage when renewable generation is abundant and demand on the grid is lower.

 

For example, some plans may offer:

  • Three hours of free electricity each day
  • Free midday electricity periods
  • Dynamic pricing structures that reward flexible energy usage

At first glance, these offers appear highly attractive. However, many consumers overlook an important detail.

 

In some cases, electricity prices outside the free period can be significantly higher than standard plans. If a household does not adjust its energy usage, the savings from free electricity may be offset by higher peak charges.

 

This is where smart energy management becomes essential.

Turning Free Electricity into Real Savings

Households with battery storage can maximise the value of free electricity periods.

 

Instead of only using free electricity during the promotional hours, a battery allows that energy to be stored and used later when prices increase.

 

Consider a battery inverter capable of charging at 5 kW.

 

If the household has access to three hours of free electricity, the system could theoretically store up to:

5 kW × 3 hours = 15 kWh

 

That stored energy could then be used during the evening peak period, helping reduce or eliminate expensive grid imports.

 

Without a battery, most households can only benefit from the electricity they consume during the free period itself. With a battery, the value of those free hours extends throughout the day.

Best Appliances for Load Shifting

Certain household appliances are particularly well-suited for load shifting because their operating times are flexible.

 

These include:

  • Electric vehicle chargers
  • Heat pump hot water systems
  • Pool pumps
  • Dishwashers
  • Washing machines
  • Clothes dryers
  • Air conditioning systems with smart scheduling

By operating these appliances during solar production hours, free electricity periods, or off-peak tariff windows, households can significantly reduce electricity costs without sacrificing comfort.

Common Energy-Saving Mistakes

Many homeowners invest in solar or battery systems but still miss out on savings.

Common mistakes include:

  • Focusing Only on Feed-in Tariffs: A strong feed-in tariff helps, but lowering electricity imports is often more valuable.
  • Ignoring Peak Electricity Rates: Cheap export rates do not always offset expensive peak-time usage.
  • Not Using Free Electricity Periods: Free electricity only saves money if usage is shifted into those windows.
  • Underusing Battery Storage: Without smart charging and discharging, batteries cannot deliver their full value.

Together, these can reduce bills and improve energy independence.

Conclusion

Peak shaving and load shifting are two simple ways to cut electricity costs.

 

Peak shaving reduces expensive grid use during peak periods. Load shifting moves energy use to cheaper times.

 

When paired with solar, batteries, and smart plans, they can deliver much greater savings.

Frequently Asked Questions

What is the difference between peak shaving and load shifting?

Peak shaving reduces electricity imported from the grid during expensive peak periods, usually by using stored battery energy. Load shifting moves electricity consumption to lower-cost periods. Both reduce electricity bills but work in different ways.

Do I need a battery for peak shaving?

In most cases, yes. A battery stores energy when it is cheap or generated by solar panels and uses it during expensive peak periods, helping reduce electricity costs.

Can I do load shifting without a battery?

Absolutely. Many households shift loads by running appliances such as dishwashers, washing machines, hot water systems, or EV chargers during off-peak periods or solar production hours.

How much money can peak shaving save?

Savings vary depending on your electricity plan, battery size, and household energy usage. Homes on time-of-use tariffs often see the greatest benefits because peak rates are significantly higher.

Can a battery store electricity from free electricity periods?

Yes. If your battery supports grid charging, it can charge during free electricity hours and discharge later during peak periods, maximising the value of your energy plan.

How do free electricity plans work?

These plans provide electricity at no cost during specific hours of the day. However, electricity rates outside the free period may be higher, making energy management and battery storage especially valuable.

What appliances are best for load shifting?

EV chargers, heat pump hot water systems, pool pumps, dishwashers, washing machines, clothes dryers, and smart air conditioners are ideal candidates for load shifting.

What is a Virtual Power Plant (VPP)?

A Virtual Power Plant connects thousands of home batteries into a coordinated network that can support the electricity grid and potentially generate additional rewards for participants.