tl,dr: Today’s advice: go with fixed power. Natural gas is more complicated.
If you’re trying to decide between fixed and floating for electricity and natural gas, this is where I lay out my (professionally informed) opinion on the matter. This is as of the beginning of February 2023, and I expect to change as time goes by.
For power, the floating prices remain very high (up to ~32 ¢/kWh in recent months), and there is no indication that they are expected to fall in the near future. Fixed prices (at ~11 ¢/kWh) remain high by historical standards, but are downright cheap in comparision. For electricity, go with a fixed rate. Our fixed prices have slowly been increasing month over month, but if (when) they drop again, you can always swap to our new, lower rate at no penalty.
For natural gas, floating prices remain high-ish. When they first started rising, it seemed to correspond to the war in Ukraine and so originally I hoped the war would soon be resolved and prices would return to “normal”; that was a year ago now. In recent months, our fixed prices have continued to fall slightly month to month, and have remained somewhat lower than our floating prices. For natural gas, it’s a toss-up: if you expect the war and natural gas supply situation to continue as it has been, go fixed; if you expect to move in the next 5 years, stay with floating (as the fixed has an early exit fee).