Feed-in tariffs once played a much larger role in the financial return from rooftop solar. Generous credits for electricity sent to the grid helped to shorten payback periods and made high levels of solar export feel worthwhile. Those rates have steadily declined, however, and the same amount of exported solar energy may now produce only a fraction of the savings it once did.
The change reflects what is happening across the electricity market during the middle of the day. Rooftop solar systems and larger solar farms often generate an abundance of electricity at the same time, creating more supply than the grid can readily use. As the wholesale value of that electricity falls, energy retailers have less incentive to pay higher rates for household solar exports.
This does not mean that solar power has stopped delivering value. A lower feed-in tariff changes where the financial return comes from, rather than removing that return altogether. A kilowatt-hour used within the home can avoid electricity purchased at the full usage rate, while that same kilowatt-hour exported to the grid may earn only a small feed-in tariff. Solar can therefore remain highly valuable when the system is suited to the household and its generation is used effectively. Its financial return is simply becoming less dependent on how much electricity is sent away and more dependent on how effectively that electricity supports the household itself.
Protecting those savings requires a broader view of how the system is performing and how its energy is being used. The solar system must still be producing and exporting correctly, but household energy use, electricity plans, export settings and storage options also matter more than they once did. As feed-in tariff rates continue to fall, the systems that continue to deliver the strongest return will be those designed and managed around the way electricity is now valued, rather than the conditions that existed when solar was first installed.
Is Your Solar System Producing and Exporting as It Should?
When a higher electricity bill appears to coincide with a lower feed-in tariff, the first step is to confirm that the tariff is responsible for the full difference. Feed-in tariff credits depend on both the rate paid for each kilowatt-hour and the amount of solar energy reaching the grid. A system that is producing or exporting less than it should can therefore magnify the effect of a lower rate, making the reduction in savings appear greater than the tariff change alone would explain.
Lower production may develop through increased shading, deteriorating solar panels, failed optimisers, string faults or inverter problems. Solar exports can also be restricted by fixed or dynamic export limits, while incorrect inverter settings may constrain the system more than local distributor requirements demand. High grid voltage can cause further losses by forcing the inverter to reduce production or disconnect temporarily, particularly when surrounding solar generation is high.
Monitoring errors can make these problems difficult to distinguish from an ordinary reduction in feed-in tariff income. A current transformer installed in the wrong position or direction may confuse imported, consumed and exported electricity, leaving the monitoring data inconsistent with the retailer’s figures. If the system has not been serviced or assessed for some time, or its recent performance is unclear, having its production, settings and energy measurements checked can determine whether maintenance or correction is needed before the loss is attributed entirely to falling feed-in tariff rates.
How Can You Increase the Value of the Solar Power You Use?
As solar feed-in tariff rates fall, the difference between exporting solar power and using it within the home becomes increasingly important. A kilowatt-hour sent to the grid may earn only a small credit, while the same kilowatt-hour used directly can replace electricity charged at a much higher usage rate. Increasing solar self-consumption allows a household to retain more of the value created by its solar system, even as retailers reduce what they pay for surplus energy.
This does not necessarily require using less electricity, but using flexible appliances at times when the solar panels are producing strongly. Washing machines, dishwashers and pool pumps can often be moved into peak solar production hours, allowing solar energy that would otherwise be exported to meet more of the household’s ordinary energy consumption. Appliance timers, smart controls and energy automation can make this adjustment consistent without requiring each load to be managed manually.
Larger electrical loads can make an even greater difference. Electric water heaters can be timed or controlled to heat during the day, effectively using the hot-water system to absorb surplus solar power that can be used later. Electric vehicle charging can be approached in the same way, particularly where a compatible charger can vary its output according to the excess solar available. These loads need to be scheduled carefully, as running several at once may push household demand beyond the solar system’s production and cause electricity to be drawn from the grid.
The most effective approach depends on when the solar PV system generates electricity and when the household genuinely needs it. Solar system monitoring and a solar monitoring app can help reveal how closely those patterns align, but the data needs to be interpreted in the context of the home rather than reduced to a single self-consumption figure. When energy use is deliberately matched with available solar production, lower feed-in tariffs have less influence over the system’s overall return because more of the solar investment is recovered through avoided grid electricity costs.
When Should You Consider Changing Your Plan, Solar System or Battery Setup?
Increasing solar self-consumption can improve the value of an existing system, but the electricity plan still determines what the household pays for energy drawn from the grid and receives for solar exports. A plan offering the highest solar feed-in tariff is not always the most economical once its usage rates, supply charge and time-of-use periods are considered. As feed-in tariff rates fall, comparing energy plans against the household’s actual import and export patterns becomes more useful than judging them by the advertised solar rate alone.
The way larger electrical loads are billed also matters. An electric water heater connected to a controlled load may receive a lower electricity rate, but it may also operate when little or no solar power is available. Moving hot-water heating onto a timer or solar-aware control could increase self-consumption, although the benefit depends on the difference between the controlled-load rate and the value of the surplus solar being redirected. Time-of-use and solar sponge tariffs can create similar opportunities by offering cheaper grid electricity during periods of abundant renewable energy, but they can also become expensive when substantial energy consumption falls within peak periods. The right tariff structure therefore depends on when the household imports electricity, not simply how much it uses overall.
If daytime demand regularly exceeds solar production, expanding the solar panel system may reduce more electricity purchased at the usage rate. Additional solar PV is less likely to improve savings where the existing system already produces a large surplus that cannot be used, stored or exported because of export caps. Any proposed expansion needs to be considered alongside available roof space, inverter capacity, distributor approval and the household’s likely future energy consumption, particularly if an electric vehicle, induction cooking or electric hot-water system is planned.
A solar battery can retain surplus generation for use after the panels stop producing, reducing reliance on both the electricity grid and low feed-in tariff rates. However, battery storage does not automatically provide a worthwhile return. Its value depends on how much surplus solar energy is consistently available, how much electricity the household imports outside solar-producing hours, the difference between import and export rates, and the usable capacity and expected life of the battery. Government rebates and Virtual Power Plants may improve the figures, but their conditions, control arrangements and effect on battery use also need to be understood.
Correct battery sizing is particularly important. An undersized battery may leave useful solar energy uncollected, while an oversized battery may rarely charge or discharge fully enough to justify its additional cost. Payback should therefore be calculated from the household’s solar analytics, smart meter data and seasonal energy consumption rather than from a general estimate. As the electricity market continues to change, protecting the value of a solar investment increasingly depends on whether the energy plan, solar system and battery storage setup work together around the household’s actual usage, rather than whether any single component appears attractive on its own.
