New Zealand households can reduce electricity bills by aligning their power plan with specific appliance usage and daily consumption habits, according to research from the Electricity Authority. Because there is no universal “best” plan, experts warn that consumers must evaluate whether their energy usage is fixed or flexible to avoid paying higher rates for the wrong pricing structure.
Why one-size-fits-all power plans do not exist
Power retailers offer a complex array of pricing models that vary based on daily fixed charges and variable unit charges. According to Gretton, the Electricity Authority’s lead advisor for research, evaluation and insights, the diversity of household schedules and appliance types makes it impossible to recommend a single plan that works for everyone.
Energy consumption is generally split into three equal parts: space heating, water heating, and general electrical use, including lighting, refrigeration, and appliances. Understanding which category dominates a household’s usage is the first step in selecting a cost-effective plan. For instance, a home reliant on a heat pump for space heating has limited flexibility because the heater must run when the house needs warmth, often during peak demand periods.
How to choose between fixed rates and time-of-use plans
Choosing the right plan depends on a household’s ability to shift power consumption to off-peak hours. According to Gretton, households that use gas for water or space heating often have less flexibility and may find fixed-rate plans more predictable.
Conversely, fully electric households—those using electricity for heating, water, and electric vehicle (EV) charging—are better positioned for dynamic or time-of-use plans. By utilizing timers on hot water cylinders and scheduling EV charging for nighttime, these households can shift a significant portion of their energy load to periods when electricity is cheaper. Consumers can also minimize costs by pre-heating their homes during off-peak hours, reducing the energy demand during the high-cost morning and evening peaks.
Managing electric water heating costs
Water heating often accounts for one-third of a home’s total power consumption, making it a primary target for cost savings. The Electricity Authority identifies two main methods for managing this cost:
- Day/night plans: These use a timer to ensure the water cylinder primarily heats at night, with minimal “top-up” heating required during the day.
- Ripple control: This system allows the electricity supplier to briefly interrupt the supply to the hot water cylinder during peak demand times, often resulting in lower rates for the consumer.
The availability of these options depends on the local network provider and the specific retailer. Consumers are encouraged to contact their supplier to confirm if their property is currently set up for ripple control or if a timer can be installed for a day/night plan.
Frequently Asked Questions
Can I switch plans if I have a smart meter?
Yes, smart meters provide the interval data required for most time-of-use or dynamic pricing plans, allowing for more precise tracking of when you consume electricity.
Is a night rate always cheaper?
Night rates are generally lower, but they are only cost-effective if you can shift significant loads—like EV charging or water heating—to those hours. If your usage remains high during peak times, a night-rate plan may result in higher overall costs.
How do I know if I have ripple control?
You can check your power bill for a specific “controlled” rate code or contact your energy retailer. They can confirm if your hot water cylinder is connected to a ripple control receiver.
Have you successfully lowered your energy bills by switching to a time-of-use plan? Share your experience in the comments below or subscribe to our weekly newsletter for more consumer guides.
