This is an interesting article, but IMHO, its discussions on Hacker News lacks depth. Almost all threads are debating about superficial Bitcoin issues that has already been talked endlessly, and none of the thread focused on the main thesis of this article:
> Bitcoin mining is a complex phenomenon that connects hardware and software, the energy and financial markets. Invisible rules govern every aspect of it. The performance of an individual operation is determined by various external factors that are often hard to quantify and almost impossible to forecast.
It stated that Bitcoin mining as a whole, is a complex social-economical-computational-environmental phenomenon with a huge number of moving parts and uncertainties. The most fascinating fact to me, is the direct impact of climate cycle in southern China on the mining industry, almost with a mythical tone found in some Sci-Fi novels. While Bitcoin is a highly artificial and technical construct, but its yield can be severely affected by weather, some Bitcoin miners even routinely migrate their operation according to seasonal changes like the nomadic groups of the past. The flood seasons are visible on the Bitcoin hash rate chart, and even dominates the date of trade shows and R&D schedule of new mining rigs.
> May-October is the flood season in Southwest China. It is also a festival period for mining businesses as the large supply of surplus hydro capacity significantly cuts down miners’ operating expenses. For small-medium scale miners, the flood season can reduce the cost by as much as 40%. For large miners who own proprietary facilities, the flood season electricity cost is practically negligible. Over 80% of the miners in Xinjiang, Inner Mongolia will migrate in flocks to Sichuan, Yunnan, and Guizhou to take advantage of the discount, and they move back or sell their equipment after the dry season arrives in November.
> Gradually, the industry structured itself around these climate patterns. Like ancient rituals, every year before the flood season arrives, major mining conferences get organized in Sichuan’s capital Chengdu. Some facilities are only open to external customers during the flood season. Manufacturers plan their new product release right before it arrives. Miners race to source the latest and greatest machines in bulk.