In September 2025, competition in the Bitcoin mining sector was escalating, mining difficulty reached an all-time high, with production of most major miners falling.
Large companies with strong balance sheets and accumulation strategies continued to grow in this environment, but small miners faced increased pressure due to operating costs and technological fluctuations.
Bitcoin production decreases as difficulty levels increase
According to a public report compiled by BeInCrypto, Cango mined about 616 BTC in September, down from 663 BTC in August.
CleanSpark produced 629 BTC, a slight decline from the previous month. Riot Platforms generated 445 BTC (477 BTC in August). BitFuFu’s output fell sharply to 329 BTC, but Marathon Digital Holdings (MARA) maintained its lead by mining 736 BTC, further expanding Bitcoin reserves.
Bitcoin production by a major mining company. Source: BeInCrypto
The data suggest that while large-scale miners have been able to maintain relatively stable production, small-scale miners are beginning to feel the burden of increased difficulty and energy costs.
Holds BTC from selected companies. Source: BeInCrypto
Meanwhile, Bitcoin’s network difficulty rose to 142.34T in September, reaching an all-time high. This consistent increase in difficulty means that the BTC generated at each hash rate unit decreases, resulting in a lower hash price (revenue per unit of calculation power).
As a result, miners’ profit margins continue to shrink, especially for miners with high energy costs or low hardware efficiency.
The difficulty of mining bitcoin. Source: Blockchain.com
Notably, New York’s new anti-Bitcoin mining bill recently proposed progressive taxation on Bitcoin mining companies, with the revenue being diverted to reduce utilities for residents. The outlook for the bill is unclear, but it could disrupt the multi-billion-dollar data center plan and tighten cryptocurrency regulations in the state.
In summary, Bitcoin production in September revealed an increased technological pressure on mining. With difficulty continuing to rise and profit margins shrink, major miners like MARA, with efficient infrastructure and BTC accumulation strategies, are still in a strong position.
Small businesses need to carefully consider selling BTC, reducing their power capacity, or expanding their business size to survive an increasingly competitive and unstable situation.
Softens amid growing difficulty after Bitcoin production in September — MARA keeps its lead first appeared on BeInCrypto.
