EDF Fix any good?

schnegge_london

Got an email from EDF yesterday, offering me a fix 
I'm electricity only, currently on the SVT in London (Unit rate at 29.24 and Daily Standing Charge at 37.92).
They're offering me a unit rate of 42.93 (46% more than the current SVT), standing charge the same.
Early exit fee is 150, but the first 50k customers who choose this tariff also get a 150 off their bill

I'm calculating that it will fall in 1 low consumption month (August) and one low-medium consumption month (September) until the SVT will raise anyway. 
So I will spend more now, but as said this will be low to medium spend months, so I assume I might loose around 50-75 together in August and September as my current spend in June and July was around 50 each month. 

Just got my energy bill last week and my yearly consumption is estimated to be around 4500kwH, mostly coming from heating and in the winter months, as currently my spending is extremely low - only 569kWh between 01.04. - 22.07. 

Is this fix any worth? I heard predictions that the SVT will go up by around 65% (probably even more after what happened with Nord Stream again), although it is unclear how much of it will be electricity. 

Any advise is welcome!

Alnat1

I'd grab it if you can get the £150 credit. Basically means there's no exit fee so if things do change you can get out for free.