Do renewables actually lower power prices? The evidence is more complicated
Renewable generation does put genuine downward pressure on wholesale electricity prices, but wholesale prices are only one component of what households actually pay, and the total cost of the transition, transmission, storage, firming capacity, grid stabilisation, has frequently exceeded the wholesa
"Renewables will bring down power prices" is one of the most repeated claims in Australian energy politics, and it is not exactly false. It is selective, true of one part of the bill while silent about the parts that have been rising.
The part of the claim that's true
Wind and solar generation have near-zero marginal cost once built, generating another unit of electricity from them costs almost nothing. Electricity markets dispatch generators from cheapest to most expensive, so when large volumes of near-zero-cost renewables enter the grid, they displace higher-cost gas and coal generation and reduce the wholesale price for the last unit dispatched. This is called the merit-order effect, and it is real and well documented: studies of Germany and Austria found that increased renewable output reduces short-run wholesale prices, with wind power reducing wholesale prices by up to £7 per megawatt-hour per additional gigawatt-hour at low penetration levels, and solar producing a similar effect.
What the wholesale price doesn't capture
The wholesale saving coexists with rising costs elsewhere in the system that don't show up in the same number. Intermittent generation needs backup capacity, gas peakers, pumped hydro, batteries, that must be built and maintained even when it isn't running, plus grid-scale storage that remains expensive; these costs appear in network charges and capacity payments, not the wholesale spot price. Renewable generation is also often located far from population centres, and connecting it requires new transmission infrastructure, Australia's own market operator estimates transmission buildout alone at $6 billion for the current transition plan, recovered through regulated network charges that are a fixed line item on every household bill. Traditional coal and gas generators provide grid stability and frequency inertia as a physical byproduct of spinning turbines, something inverter-based renewable generation doesn't provide, requiring additional investment in synchronous condensers and grid-forming batteries just to maintain a stable grid.
Germany's twenty-year head start
Germany has invested more heavily and for longer in renewables than almost any developed economy through its Energiewende program, and the result is that German household electricity prices are consistently two to three times Australian prices, among the highest in the developed world. Germany's simultaneous nuclear phase-out removed reliable, low-cost baseload generation at the same time as the renewable build-out, compounding intermittency costs. Recent analysis of the German system found that while renewable expansion does exert downward pressure on wholesale prices specifically, the combined system effect points toward considerably higher electricity prices in coming years compared to pre-crisis levels.
Australia's own numbers
The Australian Energy Market Commission's 2025 projections show residential per-unit prices falling roughly 5 percent over the next five years under the current trajectory, but with prices at risk of rising as much as 13 percent between 2030 and 2035 if new renewable, battery and transmission projects aren't delivered on schedule. The transition cost is estimated at $106 billion, split roughly $6 billion for transmission and $97 billion for generation, storage and firming, against an official projection that this investment saves $30 billion in avoided fuel and operating costs relative to the alternative pathway. In the meantime, Australian electricity prices have risen substantially over the past decade, the same period as the accelerating renewable transition, and federal and state governments have needed to introduce energy bill relief payments to cushion households from the increase. CSIRO's annual GenCost analysis, Australia's standard reference for generation costs, confirms new-build renewables are the cheapest new generation source on a per-megawatt-hour basis, but CSIRO itself acknowledges GenCost doesn't include the full system costs, storage, firming, transmission, needed to deliver reliable supply from intermittent sources, a limitation frequently omitted when the headline figure is cited politically.
Reading the claim honestly
The existence of energy bill relief is itself the clearest evidence available that the transition is not straightforwardly lowering household costs. If it were, the relief would not be necessary. None of this is an argument against the transition, or a claim that renewables can never deliver lower prices, the wholesale effect is real and technology costs continue to fall. It is an argument for precision about which number is being cited: political claims about renewable cost reductions typically refer to wholesale or generation costs specifically, while household bills include network charges, environmental levies, metering and retailer margins, the components that have actually been rising.
Frequently asked questions
Do renewables lower electricity prices or not?
They lower wholesale prices through the merit-order effect, a real and measurable effect. Total household bills include other rising costs, network charges, storage, transmission, that the wholesale price doesn't capture, which is why bills and wholesale prices can move in different directions.
Why has Germany's shift to renewables coincided with such high prices?
Germany combined an aggressive renewable build-out with a simultaneous nuclear phase-out, removing low-cost reliable baseload at the same time as adding intermittency costs, a combination that compounded the price effect.
Is Australia's electricity transition going to make prices cheaper eventually?
Official AEMC projections show a modest fall over five years under the current plan, but with meaningful upside price risk later in the decade if renewable, battery and transmission builds fall behind schedule.
Why does the government need to pay energy bill relief if renewables are supposed to lower prices?
Because the relief exists specifically to offset rising costs during the transition period, which is the clearest practical evidence that the transition has not been reducing overall household costs so far.