A new report suggests that simply changing when electricity is used — rather than how much — could ease pressure on New Zealand’s power network, lower household bills, and delay billions of dollars in infrastructure spending.
New Zealand’s electricity system is built to cope with short bursts of intense demand. These peaks typically arrive in the early evening, when households return home, turn on heating, cook meals, and run hot water at roughly the same time. While these spikes are brief, the network must be strong enough to handle them — an expensive requirement that ultimately feeds into power bills.
A new analysis commissioned by the Energy Efficiency and Conservation Authority suggests there may be a far cheaper alternative. The report finds that nearly a quarter of peak electricity demand could be shifted to off-peak periods, potentially saving up to $3 billion in infrastructure investment that would otherwise be needed to support growing demand.
The idea is not to reduce comfort or restrict access to power, but to smooth out when electricity is used. If demand is spread more evenly across the day, the network can operate more efficiently and expensive upgrades can be delayed or avoided altogether. According to the authority, the savings from lower network costs should flow through to households and businesses over time.
The timing of the report is significant. Electricity demand is expected to climb sharply over the coming decades as transport, heating, and parts of industry shift away from fossil fuels. Government modelling has estimated total electricity demand could grow between 35% and 82% by 2050, depending on how quickly electrification accelerates.
The electricity network is designed for peak demand that occurs only for short periods. Shifting even a portion of that demand can reduce the need for costly new infrastructure.
Households are identified as having the greatest potential to change their usage patterns, simply because of their number. While rooftop solar panels and home batteries can help shift demand, the report highlights far lower-cost options that are already available. These include Wi-Fi-enabled devices that can be retrofitted to hot water cylinders and heat pumps for a few hundred dollars.
Such technology allows households to control when appliances draw power. For example, a heat pump can warm a house earlier in the afternoon, before peak demand kicks in, ensuring homes are comfortable when people arrive home without adding to the evening surge. Trials currently underway suggest participating households are already seeing savings on their electricity bills.
The report also points to opportunities beyond the home. Some industrial and manufacturing processes could shift electricity use if it does not disrupt production or increase costs. Sectors such as food processing, farming, and office-based businesses were identified as having meaningful flexibility, particularly when supported by battery storage and smart load control systems.
However, the question of incentives remains critical. Energy experts have warned that if households and businesses are expected to invest in new technology that benefits electricity retailers and network operators, pricing structures and rewards must be fair. Without clear financial benefits, voluntary participation may remain limited.
The report argues that a robust reward system — including direct payments and long-term reductions in energy costs — could unlock much greater participation. If flexible electricity use is enabled at scale, the cumulative impact could significantly reduce pressure on the grid while lowering costs across the system.
Full details of the findings are available through the Energy Efficiency and Conservation Authority, while long-term demand projections are outlined in the government’s electricity demand scenarios.
Taken together, the findings suggest that one of New Zealand’s cheapest energy solutions may not involve building new power stations at all — but simply rethinking when electricity is used, and ensuring households and businesses are rewarded for helping the system work more efficiently.
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