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Alex Kimani

Alex Kimani

Alex Kimani is a veteran finance writer, investor, engineer and researcher for Safehaven.com. 

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An Energy Blackhole? The Dirty Truth About Bitcoin Mining


This year’s bitcoin bull run has coincided with record levels of mining activity--in fact, it’s seen an 800% increase since $20,000 peak to 84 quintillion hashes per second in September, re-igniting the years’-old debate: how eco-friendly is crypto mining? 

For some crypto buffs, critics who squawk at the vast amounts of energy supposedly consumed by crypto mining and how it contributes to climate change are little more than churlish, pedantic party poopers. 

In one camp are the PoW (Proof-of-Work) maximalists who argue that bitcoin is the “most secure public chain” as measured by hashrate, but denying that bitcoin is an energy hog.

In the other camp are crypto apologists (such as CoinShare) who concede that bitcoin and crypto mining are indeed power-hungry processes, but immediately go on the defensive by claiming that most of the energy is derived from renewable sources.

You probably already know where this is going. The long and short of it: bitcoin and crypto mining do consume vast amounts of power, as we shall see shortly.

Securing crypto networks is costly

By necessity, the most secure cryptographic networks such as bitcoin and ethereum are also the most energy intensive since they rely on heavy resource consumption to defend their networks from malicious attackers. PoW projects, like bitcoin, rely on mining to secure their blockchains and require the hashing power to continue even after every coin has been mined. Less resource-intensive networks do not employ such rigorous processes and are, consequently, almost certainly less secure.

Mineable coins belong to the PoW category, of which CoinMarketCap lists a total of 581. These are the main culprits as far as energy guzzling is concerned. Non-mineable coins such as Ripple, EOS, Stellar, Tezos, NEO and NEM are more energy efficient as they don’t require tons of energy to validate transactions and secure the network as their PoW brethren. Related: A Million-Mile Electric Car Battery? Musk Wasn’t Lying

And now to the million-dollar question: how much energy does bitcoin and crypto mining suck off our power grids every year?

Source: Digiconomist

Available data varies quite a bit depending on whom you ask, and is, quite frankly, all over the place.

Figures of sub-10 TWh per year have been thrown about, with this miner placing it at a relatively tame 2.85TWh/year at the lower bound and 6.78TWh/ year at the upper bound, depending on the efficiency of the mining rigs. That was 2.5 years ago, and since then more efficient rigs have hit the market while mining activity has also increased quite dramatically. These two trends have opposite effects on overall costs, so we cannot be sure what data this methodology would yield currently.

A June issue of energy magazine Joule estimated it at 45.1TWh/year, or about 0.2% of all global electricity produced, with a carbon footprint at 22.0 to 22.9 MtCO2.

Digiconomist uses the portion of mining revenues spent on electricity costs to estimate power consumption. Using this method, the organization estimates current consumption at 73.1 TWh/year.

Those figures, though, could be highly conservative and the real thing could be in the ballpark of 160TWh/year as per the Cambridge Bitcoin Electricity Consumption Index, the latest tool of its kind to emerge in the space. That’s about 0.6% of global electricity production and enough to power Switzerland for two years with some change. The carbon footprint is ginormous, too--34.7 Mt CO2 per year, comparable to the carbon footprint of Denmark.

It’s worth noting that Cambridge’s estimated consumption of 76.3 TWh/year tallies favorably with Digiconomist’s figure, which works out to ~0.3% of global electricity output. These sources were chosen not least because Digiconomist seems to have been validated by Cambridge and possibly won a long-running diatribe against Marc Bevand (publisher of the 2017 estimates) regarding whose methodology is more accurate.

Both Digiconomist and CBECI can also be used for prognostication for future estimates.

Mind you, that’s bitcoin only--not counting power consumption and carbon footprint of altcoins such as bitcoin cash, ethereum, litecoin and monero among others. Related: Oil Discoveries Hit 70-Year Low

Unfortunately, we don’t have much recourse here. Digiconomist only provides bitcoin and ethereum energy consumption estimates while CBECI only does it for bitcoin. According to the firm, ethereum’s energy footprint has declined from an all-time high of 21TWh/year in July 2018 to 7.7 TWh/year currently.

That’s only a tenth of what bitcoin guzzles up.


Source: Digiconomist

It’s possible to estimate the energy consumption of other altcoins by checking out their hash rates and making assumptions about the type of mining rigs deployed and their respective efficiencies. However, those figures could be wildly off the mark as we have seen with Bevand’s estimates.

Considering that bitcoin’s dominance has climbed from 50% of all cryptocurrency (market cap) over the past year to 67% currently, you can bet this is where the vast majority of mining action is taking place. As very rough back-of-napkin math, it’s logical to estimate that bitcoin and ethereum mining account for ~80% of crypto mining energy, with other cryptos sharing the rest.

That would place total energy by cryptocurrency mining at ~100TWh/year. Even with more efficient rigs being constantly pressed into action, electricity costs will hover ~60% of mining revenue over the long-term according to some estimates, meaning energy consumption by crypto mining will only continue to climb in the foreseeable future. Emerging mining technologies like merged mining, however, could possibly mitigate some of that.

Regarding CoinShare’s bold claim that the bitcoin network sources nearly three quarters of its energy from renewable sources, the actual figure is closer to 28%.

By Alex Kimani for Oilprice.com

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  • Bill Simpson on October 09 2019 said:
    If you add it all up, you will discover that bitcoin is an environmental crime which will eventually kill millions. It consumes a vast amount of electric power, and generates a tremendous amount of dangerous greenhouse gas, for virtual no useful purpose other than making a few people rich.
    Worst of all, it depletes our FINITE supply of FOSSIL FUELS, faster than if the menace did not exist. When those fossil fuels are gone, billions of people will starve to death.
    It should be outlawed, and any country not cooperating should be sanctioned, with all trade and commerce being cut off. If that doesn't work, cut off their Internet access and blow up their electricity grid and petroleum refineries. I bet that will stop it.

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