Some energy sources might look “cheap” upfront, but the real cost? It’s often buried in volatility, hidden charges, or long-term risks. If you’re a business owner weighing up your options, the big question isn’t just which type of energy is cheapest – it’s what makes energy truly cheap over time?

Here’s the straight answer, backed by behavioural economics and hard data: renewables like solar and wind have become the lowest-cost sources of energy generation globally – and increasingly here in Australia.

But as always, the nuance matters. Let’s unpack it.

What is the cheapest type of energy in Australia right now?

Short answer: Utility-scale solar and wind now consistently outprice fossil fuels on a per-megawatt-hour basis.

According to the International Energy Agency (IEA), new utility-scale solar projects can deliver electricity at less than AUD 60/MWh – with wind power often competitive or even cheaper, depending on location and infrastructure.

And here’s where things get interesting: While coal and gas plants may appear cheaper due to sunk costs, they're prone to market volatility. Wholesale gas prices in Australia have more than doubled in recent years due to geopolitical shocks, supply constraints, and domestic policy uncertainty.

So what’s really cheap? Predictable, low marginal cost, and scalable energy generation. That’s wind and solar, hands down.

Why are renewables now considered the “cheapest”?

Several behavioural and structural shifts have helped renewables take the lead:

• Economies of scale: The cost of solar PV has dropped over 85% in the past decade.
• Low operating costs: Once installed, wind and solar plants have minimal fuel and maintenance expenses.
• No fuel price exposure: Unlike gas or coal, the “fuel” (sunlight or wind) is free.
• Grid investment alignment: New grid policies increasingly favour clean, decentralised supply.

Think of it like this: If you're running a café, would you rather buy coffee beans at fluctuating prices every week, or own a machine that prints beans for free once it’s paid off? That’s the behavioural advantage of renewables – long-term predictability.

Are renewables always cheaper for businesses?

Not instantly – and here’s where smart strategy comes in.