Bitcoin Mining Explained: How It Works and the Energy Debate

Bitcoin Mining: A Complete Guide

Bitcoin mining is the process by which new Bitcoin are created and transactions are validated on the network. It's the backbone of Bitcoin's security model, and it's one of the most misunderstood aspects of cryptocurrency. This guide explains everything from the basics to the energy debate.

What is Bitcoin Mining?

Bitcoin mining is a process where specialized computers compete to solve complex mathematical puzzles. The first computer to find the solution gets to add the next block of transactions to the blockchain and receives a reward of newly minted Bitcoin. This process serves two critical purposes:

1. Creating new Bitcoin: Mining is the only way new BTC enters circulation
2. Securing the network: The computational work makes it nearly impossible to attack or manipulate the blockchain

How Mining Works: Step by Step

1. Transaction Collection

Miners gather unconfirmed transactions from the mempool (a queue of pending transactions). They typically prioritize transactions with higher fees, as these fees are part of their revenue.

2. Block Assembly

The miner assembles selected transactions into a candidate block. This block includes a special transaction called the coinbase transaction that sends the block reward (currently 3.125 BTC) to the miner's address.

3. Proof of Work

The miner's hardware repeatedly hashes the block header with different nonce values (a random number). The goal is to find a hash that is below a target value — essentially a number that starts with a certain number of zeros. Modern ASIC miners perform trillions of these calculations per second.

4. Block Propagation

When a miner finds a valid hash, they broadcast the new block to the network. Other nodes verify the block and add it to their copy of the blockchain. The winning miner receives the block reward plus all transaction fees in the block.

Mining Hardware

Bitcoin mining has evolved dramatically since 2009:

Type	Example	Hash Rate	Power Usage	Era
CPU	Intel Core i7	~10 MH/s	~150W	2009-2010
GPU	AMD Radeon 5870	~400 MH/s	~200W	2010-2013
ASIC (early)	Antminer S1	~180 GH/s	~360W	2013-2016
ASIC (modern)	Antminer S21	~200 TH/s	~3,500W	2023+

Today, mining Bitcoin with anything other than a specialized ASIC (Application-Specific Integrated Circuit) is not profitable. These machines are purpose-built for Bitcoin's SHA-256 algorithm and cost thousands of dollars.

Mining Pools

Because the difficulty of mining is so high, individual miners rarely find blocks on their own. Instead, most miners join mining pools — groups of miners who combine their computing power and share rewards proportionally.

How Pools Work

• You connect your mining hardware to a pool's server
• The pool coordinates work among all connected miners
• When the pool finds a block, the reward is split based on each miner's contribution
• Pools typically charge a 1-3% fee

Major Mining Pools (2026)

• Foundry USA — largest US-based pool
• AntPool — operated by Bitmain
• F2Pool — one of the oldest pools
• ViaBTC — popular Asian pool
• Binance Pool — exchange-operated pool

Mining Profitability

Mining profitability depends on several factors:

• Bitcoin price: Higher price means more revenue per BTC mined
• Electricity cost: The biggest ongoing expense. Sri Lanka's electricity rates (around 30-50 LKR per kWh for higher tiers) make home mining generally unprofitable compared to regions with cheaper power.
• Hardware efficiency: Measured in joules per terahash (J/TH). Lower is better.
• Network difficulty: As more miners join, difficulty increases and individual revenue decreases
• Block reward: Currently 3.125 BTC per block, halving again around 2028

Can You Mine Bitcoin in Sri Lanka?

While technically possible, home mining in Sri Lanka faces challenges:

• Electricity costs are relatively high compared to mining-friendly regions
• Tropical climate requires additional cooling, increasing costs
• ASIC miners produce significant noise (70-80 dB)
• Import duties on mining hardware can be steep
• No clear regulatory framework for mining operations

For most Sri Lankans, purchasing Bitcoin directly through exchanges is more practical than mining. Visit our exchanges page for options.

The Energy Debate

Bitcoin mining's energy consumption is one of the most debated topics in the crypto space. Let's look at both sides objectively.

The Criticism

• Bitcoin consumes an estimated 100-150 TWh of electricity annually
• This is comparable to the energy usage of some small countries
• Critics argue this is wasteful for a payment network

The Defense

• Renewable energy: Over 50% of Bitcoin mining now uses renewable energy sources
• Stranded energy: Mining can monetize energy that would otherwise be wasted (flared natural gas, excess hydro)
• Grid stabilization: Miners can act as flexible load, helping stabilize power grids
• Comparison context: Gold mining, the banking system, and data centers also consume vast amounts of energy
• Innovation driver: Mining incentivizes investment in cheap, renewable energy

Energy Comparison

System	Est. Annual Energy (TWh)
Bitcoin Mining	~120
Gold Mining	~240
Global Banking System	~260
Data Centers (global)	~200
US Christmas Lights	~6.6

The Future of Mining

As block rewards continue to halve, transaction fees will become an increasingly important revenue source for miners. The mining industry is also trending toward:

• Greater use of renewable and stranded energy
• More efficient ASIC hardware
• Geographic diversification away from any single country
• Integration with energy infrastructure as a stabilizing force

Learn more about Bitcoin's technology and economics in our learning center, or explore our tools for mining calculators and network statistics.

⚠️ Disclaimer: This article is for educational purposes only. It is not financial advice. Mining cryptocurrency involves significant upfront costs and ongoing expenses. Always do your own research (DYOR) before investing in mining equipment.