What is mining? Decoding the Bitcoin hash rate competition and energy consumption mystery

Since the 2008 global financial crisis, an “alternative currency” composed of code has emerged. To this day, Bitcoin mining has become one of the most controversial industry phenomena worldwide. So, what is mining? Why has it evolved from a marginal activity into a major global energy consumer, even threatening national financial systems in just over a decade?

Studies have shown that the annual electricity consumption of global Bitcoin mining exceeds 130 terawatt-hours. If considered as an independent economy, its electricity use ranks within the top 30 worldwide. What operational logic lies behind these numbers? Understanding what mining is allows us to truly grasp the essence of this computational power revolution.

From Home Computers to Mining Empires: Why Does Mining Difficulty Keep Increasing?

To understand what mining is, we must first look at how Bitcoin operates. When Satoshi Nakamoto published the white paper “Bitcoin: A Peer-to-Peer Electronic Cash System” at the end of 2008, he designed a clever issuance mechanism—verifying transactions through mathematical calculations to generate new coins. In simple terms, what is mining? It’s miners using computers to solve complex cryptographic problems; whoever solves them first earns newly minted Bitcoin as a reward.

This mechanism seems simple but is actually quite intricate. Bitcoin’s total supply is permanently capped at 21 million coins, and the issuance rate is governed by an automatically adjusting difficulty curve. Early on, when few participants were involved, running a home computer for days could mine a single Bitcoin. But as participation surged, the system automatically increased the difficulty, maintaining a relatively stable rate of new coin creation.

Every 210,000 blocks (roughly four years), the system halves the miner reward—from an initial 50 coins to 25, then 12.5, 6.25, and so on—this is known as the “halving cycle.” As a result, miners need to invest double the computational resources to earn the same amount of Bitcoin. One computer is no longer enough; hundreds are required, leading to the establishment of professional mining farms. This is the core paradox of what mining is—achieving the same reward requires exponential increases in energy input.

Today, a single specialized mining machine consumes over 1,500 watts. A medium-sized mining farm consumes enough electricity daily to power thousands of households. The heat generated by mining hardware also requires dedicated cooling systems, adding to energy consumption. It’s estimated that Bitcoin mining worldwide accounts for over 0.5% of global electricity production, with consumption accelerating.

The Truth About Miners’ Profits: The Imbalance Between Mining Rewards and Energy Costs

Given that mining involves such massive energy investments, what exactly are miners competing for? In 2009, the first Bitcoin transaction took place: a programmer bought two pizzas with 10,000 BTC. At that time, Bitcoin was almost worthless—just a toy for tech enthusiasts. But as adoption increased, its price soared.

In 2020, the Federal Reserve implemented a historic “unlimited quantitative easing,” increasing the money supply by 21% of the total US dollar issuance. Amid the frenzy of traditional currency issuance, Bitcoin’s appeal as “digital gold” surged. Its price broke through $68,000, setting a new high.

However, the price surge did not fundamentally address a key question: does the value created by mining justify its energy costs?

From a labor theory of value perspective, Bitcoin’s current state is awkward. It is not a necessary good that directly satisfies human survival needs. Most Bitcoin holders are not motivated by belief in its monetary function but are purely speculative. Despite its technological advantages—decentralization, censorship resistance, irreversible transactions—these benefits are mainly exploited on dark web black markets—for money laundering, drug trade, and scams.

In other words, from an economic perspective, what is mining? It’s more like a large-scale waste of energy. The electricity, construction, and cooling costs invested by miners are exchanged for a string of digital codes with no real-world application. When prices fall—as in the 2022 bear market—many mining operations instantly incur losses or go bankrupt. This is why some say the greatest “value” of Bitcoin is actually the electricity bills miners waste.

Global Consensus: Why Are Countries Reassessing the Cost of Mining?

The reason why the question of what mining is has attracted the attention of governments worldwide is not moral condemnation but an assessment of its national impact.

China was once the global mining hub. In the first half of 2021, Chinese mining farms accounted for over 60% of the global hash rate. These farms clustered in Yunnan, Guizhou, Sichuan, Xinjiang, and Inner Mongolia, leveraging cheap hydropower and thermal power. Research estimates that China’s annual electricity consumption for mining is equivalent to the power generated by 3.5 Three Gorges Dam. Under tight electricity supply conditions, this is akin to diverting power from other industries and residents. More importantly, the cost advantage of mining clusters can lead to “electricity arbitrage,” resulting in wasted energy rather than supporting the real economy.

In 2021, China launched a comprehensive crackdown on Bitcoin mining, shutting down many farms. Regulators explicitly stated that cryptocurrency mining is a waste of energy and conflicts with goals of carbon peaking and neutrality.

The same dilemma is spreading globally. El Salvador declared Bitcoin legal tender in September 2021, hoping to generate national revenue through mining. However, as Bitcoin entered a bear market, the country suffered losses exceeding tens of millions of dollars and faced sovereign debt crises. This serves as a stark warning—what mining brings is far greater risk than reward.

The European Union and the United States are also beginning to scrutinize the environmental and energy impacts of mining. Some countries impose taxes or regional restrictions on high-energy-consuming mining activities. Bitcoin mining is no longer a gray-area frenzy but has entered the risk assessment frameworks of policymakers worldwide.

Reflection: Understanding the Ultimate Meaning of Mining

To understand what mining is ultimately about, it boils down to a contest between energy and faith. It represents the efforts of technological utopians trying to bypass the traditional financial system, as well as the endless race for computational power in modern society.

Technically, mining maintains the decentralized operation of the Bitcoin blockchain, providing network security. But socially, what is mining? It’s a massive waste of enough electricity to light billions of people worldwide. This contradiction is unlikely to resolve in the near future and may intensify with Bitcoin’s price fluctuations.

Regardless of how markets view Bitcoin, one undeniable fact remains: behind every newly created Bitcoin is a huge energy bill. The question of what mining is ultimately points to humanity’s eternal dilemma between technological progress and resource scarcity.