Gold Coast beaches have reopened, after powerful surf conditions and extreme heat forced the closure of 11 beaches on Friday.

An early morning Surf Life Saving Queensland meeting on Saturday initially came to the decision to close Surfers Paradise, Miami, Pacific, Nobbys, Palm Beach, Bilinga and Tugun beaches but by 11amall had re-opened except for Nobbys.

SLSQ Gold Coast duty officer Grahame Long urged swimmers to exercise extreme caution in the water and stay close to shore.

"The conditions are quite unstable at the moment across the Gold Coast with a very high incoming tide causing a surge in waves, and we strongly urge all beach goers to only enter the water at patrolled locations between the red and yellow flags," he said.

Meanwhile, a total fire ban is in place across Queensland as temperatures climb into the high 30s in many parts of the state.

Queensland's energy grid will be challenged over the sweltering weekend as fans and air conditioners work overtime.

The state is expected to receive increasing temperatures at the weekend, topping out at 39 degrees on Sunday in Brisbane and up to 46 degrees as far west as Birdsville.

The temperature on Sunday will be about nine degrees above the February average with temperatures to reach near-record levels.

As temperatures rise, so will the strain on the energy grid.

Energex executive general manager of asset, safety and performance Peter Price said he was "confident" the network could handle it.

"I'm very confident the network will perform well, just as it did on January 18th when we had a peak demand," he said.

About 5000 megawatts of power was used on January 18 and Mr Price expected a bit less to be required this weekend.

However, he wasn't able to give an absolute guarantee there would be no blackouts, but said Energex would be monitoring workloads and have crews ready to respond.

He encouraged Queenslanders to set air conditioners to 24 degrees to reduce energy waste while remaining comfortable.

In addition to catering for Queenslanders, the energy grid will also be helping New South Wales.

Queensland Energy Minister Mark Bailey said the northern state had a "very robust" power system, with excess capacity of about 2000 megawatts, and would be sending any reserve power across the border.

"We're expecting Queensland power to be chiming in through the interconnector to help our bigger NSW neighbours to meet their power needs," Mr Bailey said.

"Without Queensland power today, NSW would be in absolute dire straits."

Mr Bailey said Queensland would still have more than 1000 megawatts in reserve, so the state was ready for any contingencies.

The impact of the sweltering conditions wasn't limited to the energy grid, with students hospitalised north of Brisbane.

Paramedics were called to The Lakes College in North Lakes on Friday morning where they found a total of 16 students affected by the extreme heat.

Queensland Ambulance acting operations supervisor Jen Pearce told reporters the students were part of an outdoor parade celebrating a new building when they began suffering from dizziness, nausea and headaches.

Three were taken to hospital as a precaution and 13 others treated at the scene.

Soccer matches across the state were also either been postponed, cancelled or moved to a later kick-off time in anticipation of the heat.

"The weather is anticipated to be 37 degrees this weekend, putting the safety and wellbeing of participants and spectators at risk," Football Queensland said in a statement.

Brisbane is expecting a brief reprieve next week, with temperatures to dip to 36 degrees on Monday and 29 on Tuesday. Possible showers are also forecast throughout the week.

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