A sharp rise in the number of solar rooftop installations in Queensland is flooding the network and could lead to blackouts or frequency issues, Energy Networks Australia says.

Chief Executive Andrew Dillon said the electricity grid was not designed to cope with the amount of energy being generated in the middle of the day when demand is low, resulting in "solar spill".

"We have almost one in three households in Queensland that have solar panels on their roof and to be honest, by world standards, that is off the chart," Mr Dillon said.

"Places like Hawaii and California are more like 20 per cent so Queensland is really a world leader.

"So that's great for renewable energy generation but it's creating some real challenges for the networks operating the grid when you have that much energy coming back in in the middle of the day."

Mr Dillon said most networks were created in a time when there was a significant one-way flow from major coal fired power stations into households.

"For a while the network has operated really well to be honest, as a solar sponge being able to soak up this generation — but once we get to certain levels, if we don't start getting smarter about how we manage it, we will see some technical issues," he said.

Mr Dillon said if the issue was not addressed, problems could occur.

"The first one is we start to get voltage and frequency issues, which can damage equipment or even localise outages," he said.

"The second one is we have networks saying to customers wanting to connect solar, 'No you can't do it because we're full'."

Or, he said, the networks may end up having to spend a fortune to upgrade their facilities.

Queensland Energy Minister Dr Anthony Lynham said the Government had introduced several measures to future-proof the network.

"We have to move the peak that we're seeing during the middle of the day when we have solar, to that night time cooking peak, and we're doing that," Dr Lynham said.

The solar power landscape has changed so quickly that industry regulators were struggling to keep up. ( Supplied: Redback Technologies )

"The big thing we're doing obviously is the pumped hydro, the big Wivenhoe pumped hydro storage solution. That's 570 megawatts … that's a coal-fired power station.

"So during the middle of the day when all the solar panels on roofs are working, we're storing energy through pumping water up the top of the hill at Wivenhoe and at night time we're driving it back down."

Dr Lynham said the Government was taking a smart approach to the issue.

"We're bringing on an interest-free loan scheme for batteries later on this year," he said.

"Instead of peaking your hot water at night when power used to be cheap, you peak your hot water during the day, you have your pool pump running during the middle of the day when the solar is on.

"And also you can't have a normal meter installed in a house — if you build a house or change your meter it must be a smart meter so all those controls are available to the household."