Fred Thiel Warns Bitcoin Mining Will Become a Battle for Cheap Power

The Bitcoin mining industry is heading into one of its toughest periods yet, as escalating energy costs, intensifying competition, and a stagnant fee market threaten profitability, according to Marathon Digital Holdings (MARA) CEO Fred Thiel. 

In a recent interview, Thiel described an increasingly unforgiving landscape where only the most efficient operators will remain viable.

A Maturing but Ruthless Bitcoin Mining Industry

Thiel characterized Bitcoin mining as a “zero-sum game” — a system in which gains for one miner often come at the expense of another. 

As more participants join the network and add computing power, or hashrate, the rewards are divided among a greater number of players, compressing profit margins across the board. 

“As more people add capacity, it gets harder for everybody else,” Thiel explained. “Margins compress, and the floor is your energy cost.”

Bitcoin hashrate (Source: Blockchain.com)

The global Bitcoin hashrate has climbed to record levels throughout 2025, signaling robust competition. But Thiel cautioned that this growth masks deeper structural challenges. 

The economics of Bitcoin mining, he said, are increasingly dictated by who can secure the cheapest and most stable power sources. 

Bitcoin mining has become a game of energy management, he said. 

Industry Shift Toward AI and High-Performance Computing

With profitability tightening, many miners are turning to new business models to survive. 

Some firms are repurposing their infrastructure for artificial intelligence (AI) and high-performance computing (HPC) workloads, which can generate steadier returns and capitalize on existing cooling and power systems.

You’re seeing miners pivot to adjacent industries, Thiel noted. He added that AI and HPC are natural fits because they rely on similar infrastructure. 

Meanwhile, a growing number of hardware manufacturers and major corporate players — including stablecoin issuer Tether — are launching their own mining operations, further intensifying competition. 

“You have hardware vendors running their own mining operations because customers aren’t buying as much equipment,” Thiel said. “The global hashrate keeps growing, which means everyone else’s margins keep shrinking.”

The Post-Halving Reality

The next major test for miners will come in 2028, when the Bitcoin protocol halves the mining reward from 3.125 BTC to roughly 1.5625 BTC per block. Thiel warned that this event could drive widespread consolidation or collapse among miners, particularly those relying on grid energy or small-scale setups.

“Bitcoin was designed with the idea that transaction fees would eventually replace the subsidy,” Thiel said. “But that hasn’t happened.” Unless Bitcoin’s price increases dramatically — or network fees rise enough to offset the reduced rewards — many miners could be forced offline.

The reliance on block subsidies remains a structural weakness for the industry. Despite temporary fee spikes from network activity like Ordinals or inscriptions, these surges have proven short-lived. 

“If Bitcoin doesn’t grow at 50% or more annually, the math gets very tough after 2028 — and even tougher in 2032,” Thiel said.

Smaller Players Under Pressure

For smaller miners, the outlook is grim. Many will face unsustainable operational costs in the coming years. Larger, better-capitalized firms are already adapting by building or buying power generation facilities and diversifying into AI infrastructure.

“Our strategy is to be in the lowest quartile in terms of production cost,” Thiel said. “Because in a tight market, 75% of the other guys have to shut down before we do.”

Thiel expects that by the next halving, only miners with deep energy partnerships or ownership of generation assets will remain competitive. 

“By 2028, you’ll either be a power generator, be owned by one, or be partnered with one,” he said. “The days of being a miner plugged into the grid are numbered.”

Searching for the Next Revenue Model

The long-term sustainability of Bitcoin mining depends on new forms of revenue — and the emergence of a robust transaction fee market is seen as key. While Thiel and other industry leaders have discussed ideas like banks or financial institutions pre-purchasing block space for guaranteed transaction settlement, no such models have gained significant traction.

Still, Thiel remains cautiously optimistic that the market will find equilibrium. “At some point, it self-regulates,” he said. “As miners hit profitability limits, inefficient capacity will be forced offline, and the network will balance itself.”

A Turning Point for Bitcoin Mining Economics

Bitcoin’s price resurgence in 2025 has temporarily masked some of the industry’s struggles, but Thiel argues that miners cannot rely on price appreciation alone. With the network’s energy intensity and difficulty both at all-time highs, efficiency and adaptability are now the defining traits of survival.

As the Bitcoin mining sector braces for the next halving and beyond, the competition for cheap power, advanced infrastructure, and new revenue sources will determine who stays in the game — and who gets priced out.