 "Mueang" Nong Han was one of the four original subdivisions of Udon Thani, which were converted into "amphoe" during the "monthon" "Thesaphiban" administrative reforms in 1908.Tambon Phak Top is to be the site of Thailand's largest biomass-fired power plant if plans by its owner, the Thai Appliance Industry PLC (Thaico) come to fruition.The 20 megawatt plant is facing significant local opposition.