The idea that electrifying homes will overload the grid has become one of the biggest sticking points in the shift away from gas. It sounds logical on the surface. Replace gas appliances with electric ones, and electricity demand will rise. But that assumption is starting to fall apart.
New modelling out of New South Wales (NSW) suggests the opposite can happen. Households can phase out gas without increasing electricity demand and in some cases, actually use less. The difference comes down to how energy is used, when it is used, and what kind of systems are doing the work.
Instead of treating electrification as a simple swap, the focus is moving toward efficiency and timing. Technologies like heat pump hot water systems use far less energy than the gas appliances they replace. When paired with smarter usage patterns, such as running during solar-heavy periods, they can reduce pressure on the grid rather than add to it.
This reframes the conversation. The question now is whether households and systems are set up to do it properly.
Why switching off gas doesn’t automatically mean higher electricity use
Household energy discussions often focus on fuel type, but that misses the bigger picture. What matters more is how much energy a system uses to deliver the same outcome. Heating water, warming a room, or cooking a meal can all be done with very different levels of efficiency depending on the technology behind it.
Gas has traditionally been seen as a reliable baseline, especially for heating and hot water. But it is not efficient in absolute terms. A large portion of the energy used in gas systems is lost in the process of combustion and heat transfer. By contrast, modern electric systems, particularly heat pumps, don’t generate heat in the same way. They move it, which allows them to deliver the same result using significantly less energy.
This is where the assumption breaks down. Electrification is often framed as adding load to the grid, but if the replacement systems are far more efficient, total energy demand can fall even as more appliances run on electricity.
Timing also plays a role. Not all electricity demand is equal. Energy used during peak evening periods puts far more strain on the grid than energy used during the middle of the day when solar generation is high. Looking at demand without considering when it occurs gives an incomplete picture of the actual impact.
Once both efficiency and timing are factored in, the shift away from gas starts to look less like a demand problem and more like a coordination problem.
Why hot water is the easiest place to cut gas use first
If there is one area where the shift away from gas makes an immediate difference, it is hot water. In many households, it accounts for a large share of gas use, which makes it the most practical place to start.
The reason comes down to efficiency. Gas systems generate heat by burning fuel, and a portion of that energy is lost in the process. Heat pump hot water systems work differently. They draw heat from the surrounding air and transfer it into the water using far less energy to achieve the same result.
That doesn’t change the fuel source, but reduces the total energy required in the first place. So while electricity use replaces gas, the overall demand is lower than expected.
There is also a built-in advantage that makes hot water easier to manage than other household energy uses. It can be stored. Once water is heated, it can be used later without needing to run the system again at that moment.
This makes hot water one of the few systems where households can reduce gas use, lower total energy demand, and create flexibility at the same time. It is a straightforward upgrade that delivers immediate gains without requiring changes to daily routines.
Why shifting demand changes the equation
Efficiency is only part of the story. When energy is used matters just as much as how much is used.
Electricity networks are built around peak demand, typically in the early evening when households are using multiple appliances at once. This is where the concern around electrification comes from. More electric systems could mean more pressure during these already busy periods.
But not all household energy use needs to happen at that time. Hot water is a clear example because it can be stored; it doesn’t have to be heated when it’s used. It can be heated earlier in the day and used later without any difference to the household.
This creates a simple but powerful shift; instead of adding to peak demand, systems like heat pump hot water can run during the middle of the day, when solar generation is high, and electricity is more available.
In practical terms, this can significantly reduce the load placed on the grid during peak periods. Rather than increasing pressure, electrification done this way helps smooth demand across the day.
That is what changes the equation. It’s not just replacing gas with electricity but about using electricity in a way that works with the system, not against it.
Why upgrading appliances changes the outcome
Electrification on its own doesn’t guarantee lower demand. The outcome depends on what replaces the old systems.
If gas appliances are swapped for standard electric ones without improving efficiency elsewhere, electricity use can still rise. But when electrification is paired with upgrading outdated electric appliances, the result looks very different.
Heating is the clearest example. Older electric resistance heaters and inefficient systems use far more energy than modern alternatives. Replacing both gas heating and inefficient electric systems with reverse-cycle air conditioning significantly reduces the energy required to heat a home.
The same principle applies across the household. Each upgrade compounds the benefit. Lower energy use per appliance, combined with smarter timing, starts to bring total demand down rather than push it up.
This is what shifts electrification from a simple fuel switch into a system-wide improvement. It is not just about removing gas. It is about replacing it with technologies that perform better across the board.
When done this way, the increase in electricity use from switching off gas is offset, and in some cases, outweighed by the efficiency gains from better appliances.
What this means for households planning the switch
The move away from gas is becoming a practical upgrade path that can be planned and staged over time. The key is not to treat electrification as a one-off replacement. Switching out a single appliance in isolation won’t deliver the full benefit. The gains come from combining efficient systems, shifting when energy is used, and upgrading older appliances where it makes sense.
Hot water is often the simplest starting point. From there, heating and cooling upgrades can deliver the next layer of savings, followed by smaller improvements across the rest of the home. These changes reduce both gas use and overall energy demand.
There is also a cost angle. As gas prices remain volatile and electricity becomes increasingly tied to renewable generation, households that move earlier can reduce their exposure to rising costs. Systems that run during solar-heavy periods can also take advantage of cheaper energy throughout the day.
This shows a different way of thinking about home energy. It is less about choosing between gas and electricity, and more about building a system that is efficient, flexible, and aligned with how the grid is evolving.
Why this isn’t just a fuel switch
What the NSW modelling shows is that this transition isn’t about replacing one energy source with another. It’s about changing how energy is used across the entire home.
Looking at electrification as a simple swap misses the interaction between efficiency, timing, and technology. Gas systems lock households into using energy at the moment it’s needed, often with higher losses. Electric systems, particularly newer ones, introduce flexibility. They use less energy and can be run at times that suit the grid.
When those pieces come together, the outcome is different from what many expect. Electricity use does increase in some areas, but total demand can stabilise or even fall. At the same time, pressure on peak periods is reduced rather than intensified.
That’s why the debate is changing. The question is no longer whether electrification will drive demand higher, but whether it is being done in a way that captures these advantages.
Seen this way, moving away from gas becomes less of a trade-off and more of a redesign.
The takeaway
The idea that electrification will overwhelm the grid is built on a simple assumption that doesn’t hold up under closer inspection. Replacing gas with electricity does not automatically mean higher demand.
What matters is how the transition is done. More efficient systems reduce the amount of energy needed. Flexible technologies allow that energy to be used at better times. Upgrading outdated appliances ensures those gains are not lost elsewhere in the home.
When these factors are combined, the result is a system that uses less energy overall while placing less pressure on peak demand.
That is the shift the NSW modelling points to. Moving away from gas is not just achievable at scale; it can be done in a way that improves how the energy system functions.
For households, it reframes the decision. Electrification is no longer just about cutting emissions. It is about building a more efficient, more resilient way to power everyday life.
Energy Matters has been in the solar industry since 2005 and has helped over 40,000 Australian households in their journey to energy independence.
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