Matt is an environment correspondent.
Electricity generation is under pressure due to the ongoing dry spell.
Electricity from hydropower has gone down.
Nuclear facilities that use river water have been restricted.
There are fears that the shortfalls will be a sign of things to come.
Fossil, nuclear and solar sources in the UK are being affected by high temperatures.
The technology in power plants and solar panels isn't as good in high temperatures.
Europe is scrambling for alternative sources of energy due to the dry spell.
Hydropower is an important source of energy for Europe, but the lack of water in rivers is making it harder for facilities to produce electricity.
The amount of power Italy gets from hydro has fallen in the past year.
In Spain, the amount of electricity generated is down in comparison to other European countries.
"Hydropower can be unpredictable, but 40% is extreme," says Rnningen.
He says that the figures are down in one part of Europe, but all the hydropower producing countries are making less now.
He says it is a big impact.
Hydro-electricity is a challenge for Norway. It warned that it might not be able to continue exporting energy to countries like the UK if it wasn't able to refill its reserves.
Lack of investment in modernization and transmission lines is causing problems in the hydro industry, according to some.
There will be a problem this winter. Eddie Rich from the International Hydropower Association said that it should be a wake-up call to invest more in the infrastructure.
Nuclear power production is being affected by the hot weather. Half of the fleet's 56 reactors are offline due to a systemic issue.
When the temperatures are high, the water from the rivers that are low is used to cool the reactor.
Nuclear power plants have to be cooled down once the water in the rivers is very hot. Prof Seneviratne said that the water that's released is dangerous for fish.
The French government is allowing some facilities to release very warm water back into the river.
The heat puts on energy production. The UK is one of the countries France imports from to make up the shortfall.
At a time when the very warm weather is hitting production from gas and nuclear facilities, analysts say this is putting extra pressure on the UK system.
In the warmer weather it is more difficult to cool the plants.
There is a drop off above 25C for solar panels. When it's hot, everything doesn't work as well.
The safe margins for operating the grid were reduced when the National grid triggered a capacity market notice.
The UK and France have electricity markets.
Nobody really knows what will happen if French and UK systems are stressed out at the same time.
She warned that there could be restrictions on energy use for large consumers in the winter.
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