In the UK, it's expensive, and it's not the technology, it's everything else. I don't see how that can improve unless the installation costs come down, and I don't know how that could/would happen.

I had solar installed last year, at the end of the summer, it cost roughly £14,000 for a system that can produce 6.51kWp and with 12kWh of battery storage (about 10kWh usable).

The 465W all-black panels (14 of them) I had installed are a little under £100 each to buy off-the-shelf, that accounts for 10% (£1400) of the cost of my system.

The batteries and inverter together another roughly £3.5k, so, about £9k of that cost was not for "solar and battery tech", a good chunk of it, somewhere around 40% of the total was labour, and the rest in scaffolding. Even if we allocate say another £1k to "hardware"; rails, wire, switchgear etc, that's still £8k easily.

Even if the hardware was free, £8-10k installation costs seems prohibitively expensive for the average UK household, unless you were totally wiping out your monthly bills and could pay it off over the lifetime of the system.

I suspect part of the issue in Australia is the same; I believe (perhaps incorrectly) you have a lot more sun down there so I'd expect the scale of (number of) installations to be higher.

I guess at some level it is a matter of incentives. In their city, we have electricity 20-22 hours per day (used to be 12-18 when i was growing up) and we can’t rely on the state to provide us electricity consistently.

But also, due to infrastructure. Everyone who could afford it has had a battery and inverter in our homes since forever. Hooking up some solar panels to it is relatively straightforward.

I think there are also some state sponsored subsidies involved although I couldn’t tell you how much.

~39% of Australian homes have solar as of 2025. Seems pretty widespread

I would say 10% of the homes in my estate in Derbyshire have rooftop solar. We haven't gone for it yet because I still think the cost is too high. It might work out when electricity gets even more expensive.