Which consumes more power: Banks or Bitcoins?

5 min readApr 15, 2018

In the recent days, we see bitcoin activity going for a rally after a recent dip.China, a year ago dominated the bitcoin global volume with about 90 percent share, had a complete crackdown on bitcoins in the recent past, banning initial coin offerings, also known as ICOs. The major reason for shutdown seems to be electricity consumed by Bitcoin mining which is estimated to be 4 gigawatts, equivalent to three nuclear power plants. Another reason seems to be the malicious acts of fraud and money laundering associated with cryptocurrency.

And Japan by regulating bitcoin ensured exchanges to maintain capital reserves, keeping customer funds separate, and implementing KYC procedures; and now the country accounts for more than half the volume of global bitcoin trade, while the US accounts for a quarter.

In the Indian context, the issues happen to be mostly legal: using bitcoins for money laundering and acts of terrorism are the challenges in the use of Bitcoin as a legal tender.Nevertheless, Institute for Development and Research in Bank Technology of RBI has taken the initiative of exploring the applicability of blockchain technology into the Indian banking and financial industry by conducting a meetup with academicians, bankers, regulators and technology partners, under a blockchain working group.

As the future seems to inculcate cryptocurrency in its transaction, let us peep in and see how beneficial is switching to Bitcoins from banks in terms of energy infrastructure.

Mining difficulties

There is a dynamic parameter which controls power needed to mine a bitcoin block. The problem is that the Bitcoin is constantly adjusting to keep the average time between two blocks more or less constant at 5 minutes. This implies that more the computing power is dedicated to mining bitcoin (in total), the more computing power you will need to mine the next blocks. This has driven an insane arms race among the miners, which means that it is now practically impossible to mine anything significant with non-specialized hardware (regular PCs). Miners now use specialised hardware designed to mine bitcoin called ASICs (and cryptocurrencies with the same cryptographic basis) that are several order of magnitude faster (and more energy efficient) than general purpose computers for that specific task.

What most small miners do now? They indulge in something called pooled mining: you contribute your computing power to a pool, which does the actual mining and rewards you with a fraction of the mined bitcoin. With this system, you will have earned 1 bitcoin when you have contributed about 1/25th of the computing power to mine a block (approximately; the details depend on the pool’s rules and the transaction fees too).

This truly implies you will be needing heavy processors to power the bitcoins.

Regulation difficulties

This seems to happen as the activity of money laundering increasing through Bitcoin exchanges. This could happen with any currency which is introduced worldwide. What requires is a proper regulation to limit the fraud activities and might take some time to settle things out.

As the above factors are a matter of time where bitcoins need to be accustomed to daily life, let’s see if bitcoins come more energy, energy being valuable now than banks.

Which consumes more?

According to our studies in the previous article (https://medium.com/@zodhyatech/do-bitcoins-consume-more-electricity-than-our-country-3cc354a6c191), Bitcoin consumes around 32.56 TWh. This consumption itself translates to a country consumption equal to that of Denmark.

Now we have to estimate how much electricity the banks consume. For this comparison, let’s just include three areas: server costs, branches costs and ATM costs. Of course, banks (and its employees), consume a lot more electricity from other sources but let’s focus on major infrastructure.

The next number we need is how many servers each bank uses to run their banking infrastructure. Picking a very conservative number of an average of 100 servers per bank (keep in mind banks need servers not just for the banking infrastructure but for the bank internal operations as well like ERPs, CRM, accounting systems, Website, etc.). If a server in average consumes 400Wh and since it always on, this means that banks consume in total 800 Mwh.

Let’s add to the above the electricity consumption of the branches. According to the World Bank, there are 12.5 branches per 100,000 adults in the world. As the world population is 7.6 billion and we have around 70% adults, this means a total of 665,000 branches. Only in the US, they appear to be close to 100,000 branches and assuming the US is around 15% or less of the entire banking system worldwide you get to around the same number.

Calculating a branch’s consumption turns out to be tricky since there are lots of things to take into account like the size of the branch or number of employees as well as several things consuming electricity like lights, cooling, computers, etc. And they are not open 24 x 365. So after studying some case-studies, I have decided to settle for a conservative number 15 kWh per branch assuming an average branch has 10 light bulbs, two air conditioning units that are used 40% of the time and 12 desktop computers running an average of 12 hours a day, 20 days a month through the year.

And finally, we have to include the ATMs networks that all banks use (that will also not needed in case bitcoin or other cryptocurrencies become the dominant currency and payment mechanism). There are also 3 million ATMs throughout the world. For an ATM with 2 air conditioners and lighting, the average daily power consumption comes around 48 kWh.

So total consumption for banks during a year only on those three metrics is around (I am rounding) 26 TWh on servers, 87 TWh on branches and 26TWh on ATMs for a total of close to a 140 TWh a year.

We could easily see bitcoin consumes ¼ the power of banks. But, this is just the start for bitcoins. As we move towards making every transaction using cryptocurrency, the power consumption looms. Bitcoin has special powers and it would be good to see banks incorporating the technology in a proper way to make transactions more easier than ever.

It’s a pleasure for us to share such information with you because we believe that sharing knowledge and opinions makes everyone think of a better solution. Please comment your thoughts below.

We are Zodhya, a start-up that provides solutions to reduce energy bills at zero investment to commercial buildings and establishments. Please do visit us at the website and maybe tell your friends about it too. It will go a long way in keeping our environment managed better.




Hi people! We are a startup which strives for an energy efficient,eco-friendly environment. For more, visit us at https://goo.gl/tQFPYf