CleanSpark (NASDAQ: CLSK) mined 622 bitcoin in December, increasing its total haul for 2025 to 7,746 bitcoin, a 10% increase from 2024, according to a CleanSpark release on Tuesday.
CleanSpark held 13,099 bitcoin in its treasury as of December 31, 2025, and its bitcoin mining fleet totaled 50 EH/s with an average operating hashrate of 47.2 EH/s for the month.
CleanSpark sold 577 bitcoin in December to fund growth and operations. These sales generated approximately $51.5 million in proceeds at an average price of $89,210 per bitcoin. The company deployed a total fleet of 245,199 miners by the end of the year with a peak efficiency of 16.07 J/Th.
On the AI front, CleanSpark acquired rights to a 271-acre site in Texas and secured long-term power supply agreements totaling 285 megawatts specifically for AI data centers. The firm selected Submer as a strategic partner to support this infrastructure expansion in North America.
CleanSpark hired Jeffrey Thomas as senior vice president of AI data centers to lead the new division. To finance these capital-intensive projects, the miner closed an upsized $1.15 billion zero-coupon convertible notes offering in late 2025.
CleanSparks also spent December fighting inclement weather. CleanSpark curbed power consumption by hundreds of megawatts across 11 sites in Tennessee last month. This action occurred within 10 minutes of a request from the Tennessee Valley Authority during a period of high grid demand.
CleanSpark reported 1,450 MW under contract as of the end of December, utilizing 808 MW of this total capacity.
