Just bitcoin, but all digital currencies in total can match the power consumption of banking systems.

But enough with the environmental damages, it's been discussed several times in the past.
Bitcoin blockchain is way more convenient than banks however, if banks cease to exist due to the introduction of blockchain in financial sector (that is impossible during our time) the problem would be less employment ratio.

Bitcoin's hashrate could grow too to consume even higher resources if mining become more competitive and if newer generations of ASICs failed to solve power efficiency.