A United States regulator’s decision to block an Amazon AI data center from pulling a portion of power from its adjacent Pennsylvania power plant could tighten an already competitive market for power — including for Bitcoin miners. The United States Federal Energy Regulatory Commission (FERC) on Nov. 1 rejected a request that would allow Talen Energy’s Susquehanna nuclear plant in Pennsylvania to divert some of its electricity output to Amazon’s data center, according to Bloomberg. The deal had garnered interest over the ability of the largest data center developers to quickly tap into abundan…