Assuming that you don't want to hand over the price that is now being given to you for the full job that is about twice what the estimate is, you can decide to refuse to pay for the additional amount or attempt to compromise.
If the contractor elects to try to take you to small claims
court over this, you could obtain other estimates from electricians (as well as using his own estimate) to show that he is significantly overcharging you for the job and that he is not entitled to (at least the majority of) the additional money that he is claiming.
Small claims court judges will often try to reach compromises, so you sill may be required to pay some of the additional money (a few hundred) but definitely not the entire thing, if you get estimates demonstrating that the cost should't have been much above the estimate price.
In the future, I'd definitely suggest that you get a contract in writing before going ahead with these projections to ensure another electrician or other doesn't try to take advantage of you and overcharge in a similar manner.
I hope the above information is helpful.
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