Competition in the Bitcoin mining sector intensified in September 2025 as mining difficulties reached a new all-time high and production of most major miners fell.
In this environment, large businesses with strong balance sheets and accumulation strategies continued to thrive, but small miners faced increased pressure from operational costs and technical volatility.
Bitcoin production decreases as difficulty grows
According to a published report compiled by Beincrypto, Cango mined about 616 BTC in September, down from 663 BTC in August.
CleanSpark produced 629 BTC. This has been a little soak since the previous month. The Riot platform generated 445 BTC compared to 477 BTC in August. Bitfufu’s output dropped sharply to 329 BTC, with Marathon Digital Holdings (Mara) still maintaining its lead with 736 BTC mining, further expanding its Bitcoin reserve.
Bitcoin production by major mining companies. Source: Beincrypto
Data suggest that large-scale miners were able to make production relatively stable, while smaller operators began to feel burdened by the difficulties and rising energy costs.
Holds BTC for the selected company. Source: Beincrypto
Meanwhile, the difficulty of Bitcoin’s network rose to 142.34T in September, marking its highest ever high. This consistent increase in difficulty means that each unit of hashrate will have less BTC, resulting in a lower hashprice (revenue per unit of calculation power).
As a result, miners’ profit margins continue to be increased, especially for those with high energy costs and inefficient hardware.
The difficulty of bitcoin mining. Source: BlockChain.com
In particular, New York’s new anti-Bitcoin mining bill recently proposed progressive taxes to Bitcoin mining companies, redirecting to reducing utility bills for residents. The bill faces uncertain outlook, but could disrupt multi-billion-dollar data center plans and increase state cryptocurrency regulations.
In summary, Bitcoin production in September revealed that it was supplying technical pressure to the mining industry. As difficulty continues to rise and profit margins shrink, large miners like Mara with efficient infrastructure and strategies for BTC accumulation remain in a strong position.
Small businesses should carefully consider selling BTC, reducing power capacity, or scaling operations to navigate competitive landscapes.
Post-Bitcoin production in September softens amid an increase in difficulties. Mara first appeared in Beincrypto.
