What is the most energy efficient blockchain?

“Energy is the true currency,” said Elon Musk in a podcast by Nikhil Kamath that was published December 1st, 2025. “You can’t legislate energy. You can’t just pass a law and suddenly have a lot of energy. It’s very difficult to generate energy, or especially to harness energy in a useful way to do useful work.” he continued.

In the long-term, money might disappear completely, Musk predicts. Yet, in the short term, his suggestion is that money will become energy-based, advocating for a shift of narrative towards Proof-of-Work blockchains, especially when looking at it through a cryptocurrency lens.

Physics Based Blockchains

Bitcoin is based on energy, as miners must consume electricity for computation to secure the system. That grounds it in physical reality and makes it inflation-resistant in contrast to the money that governments can print at will.

Global energy demand is increasing and blockchain technology may provide innovative solutions for the energy industry to increase efficiencies. At the same time a question rises about the efficiency of the blockchain itself.

Future economies may measure wealth in their capacity to generate and deploy energy efficiently. In that scenario, the most energy efficient blockchain may offer the most valuable currencies. This is where Alephium and Proof-of-Less-Work could come into the picture.

Proof-of-Less-Work

In an energy-based economy, the highest Return on Investment (ROI) goes to the most efficient system.

Alephium is a Proof-of-Less-Work (PoLW) blockchain, which significantly reduces the energy consumption of Proof-of-Work without sacrificing security. Cheng Wang, inventor of PoLW and founder of Alephium, explains PoLW as follows, “After a certain point, miners shift part of the external cost to internal network cost by burning some coins (and consuming proportionally less energy). In this case, mining costs are both external (energy, equipment) and internal (burning coins inside the network)”.

Below is an excerpt of Cheng Wang’s interview, where he explains the difference between PoLW and “classical” Proof-of-Work (PoW), such as that used by Bitcoin and many other blockchains. You can read the entire interview here: The Ultimate guide to Proof-of-Less-Work, the universe and everything…

“Since burning coins has a cost but does not burn energy, this is how we reduce the energy consumption without sacrificing security: in PoLW, the cost is the same as in PoW, but composed differently. To illustrate this point, imagine a world in which BTC and ALPH have the same value, and roughly the same network of miners, in this world:

You get 1.25 BTC of mining reward by spending 1 BTC in (equipment + energy costs),
You get 1.25 ALPH of mining reward by spending 0.15 ALPH in (equipment + energy costs) and burning 0.85 ALPH

In the second case, the cost is the same for the miner as in the first case, but the energy spent is vastly diminished. Of course the proportion of the external spend vs burning of coins will vary, and that will depend on the total hashrate of the miners on the network.”

The ROI Factor

This is why Proof-of-Less-Work consensus mechanism futureproofs the Alephium blockchain. It "saves" the currency (energy) while maintaining the integrity of the ledger. Since energy is money, Alephium provides a better exchange rate - you get the same level of decentralized security for a fraction of the energy cost.

In the future, AI & robotics may evolve so that they can satisfy all human needs, while money will likely continue to lose its value. In such a scenario, societies may rely on “power generation as the de facto currency,” with influence tied to whoever can produce and use energy most effectively.

Alephium is the logical evolution of money: a cryptocurrency that respects the value of energy so much that it refuses to waste a single watt.

This is a community-run blog for third-party contributors. The views expressed here are those of the authors and do not reflect the official Alephium project. This content is for informational purposes only and does not constitute financial, legal or investment advice. Cryptocurrency carries risk and is highly volatile. Information may be incomplete or outdated. Always conduct your own research. We disclaim liability for any loss or damage resulting from reliance on this article.