Except that has been the counter argument used by Brexiteers many times, that x, y and even z weren't possible because of the EU, or that certain rules and regulations were "imposed" by the EU, when in fact neither was true, it suited the government of the day and they blamed the EU. You can't argue ti both ways, but obviously you will try!
Of the issues raised by you, you clearly ahve been listening to right wing media sources too much. But lets consider the points.
Pampering to the green agenda - in what way and are you saying there isn't a climate issue or its been managed incorrectly?
Lack of investment in what exactly? There has been considerable investment in green energy though not with a consistent strategy.
Lack of exploiting what can be done nationally, explain what you mean by that?
Over taxing, really not sure what your getting out, who? Energy producers, consumers?
Really no idea what not reeling energy companies in means? Not applying a windfall tax?
Yes storage of gas is an issue, but that's not why we import electricity from France (actually that's a two way connector, whereby surplus power generated flows to where it can be used in the country. We are however heavily dependent upon Norway and the Middle East for gas as a consequence of shutting our storage facility.
We are exposed to the full market price because that's how energy is traded, even if we were self sufficient, it would not mean operating outside of that market, but the UK government could remove or change the way Electricity is priced. Currently it based on the cost of generating electricity from gas, which is on average 40% higher than that generated in other ways (i.e. wind, solar etc.). Thats why electricity prices have increased along with gas prices.
The governments support to domestic consumers has increased energy company profits with tax payers money, a combination of windfall tax on those and reduction in VAT would be fairer.
Anyway the wholesale price of gas has fallen considerably so come June/July all will be well (cough cough).
Let me put two other points in.

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