I've been on fixed electricity rate for a fair while now. But floating for gas for just as long.
I just locked in for gas, at the 4.09 other people are noting. Floating comes with a $1 (well 99 cents) extra charge, so current floating (at least on my last bill i think) puts me around fixed anyway.
Biggest reason though is that a lot of people are forecasting quite high natural gas potential costs. See, for instance, Blake Shaffer, an econ/energy (electricity focus I think?) prof:
https://twitter.com/bcshaffer/status...77702945378307
https://twitter.com/bcshaffer/status...87516432977922
He's saying locking in to both could save you $30/month gas, $50/month electricity (give or take).
Obviously a bit speculative/guess work involved, but like others have said - at least with enmax - you can change 1/month. So you can lock in / lock out to almost your heart's content...