According to the Institute for Far Eastern Studies (IFES):
North Korea, which has been focusing its efforts on increasing energy production, is currently paying close attention to micro hydropower systems. Micro hydropower is a type of hydroelectric power system which can effectively harness industrial water and/or hydroelectric resources from water and sewage systems to produce electricity.
A November 2, 2014 article published in the North Korea Workers’ Party’s official newspaper, the Rodong Sinmun, reported on the advantages and efficiency of micro hydropower, of which it claims North Korea has implemented and is currently using. The harnessing of industrial and sewer system water was once a mere point of interest for North Korea; but according to the newspaper article, a variety of micro hydropower equipment has since been installed and is currently generating up to 100kW of power for the nation.
The newspaper explained, “Industrial waste water used for cooling or cleaning in factories has a fixed height and pressure, and can be used as a water power resource to produce electricity due to its stable quantity and flow rate. . . . In water and sewage systems, catchment areas and sewage purification plants have freefalling water which can be used as a water power resource, and in air conditioning systems, the circulating cooling water can also be potentially utilized.”
The article also praised micro hydropower systems for their low initial investment cost and operation fees.
According to the Rodong Sinmun, construction costs for the levees used in a hydroelectric power plant can account for over fifty percent of the total construction costs of the system. But, because micro hydropower systems can be installed and connected directly to existing pipes, costs are reduced dramatically, and the low-flow, low-pressure nature of the micro hydropower system allows for additional savings on materials such as waterwheels and generators.
The costs of installing a micro hydropower system may be double that of a diesel-powered generator, but when taking the cost of fuel into account, micro hydropower systems are said to be much more economical in the long term.
The newspaper also reported about one micro hydropower facility which even utilizes the piping and freefalling water from their service-water purifier. According to the article, the system produces enough electricity to power the water purification and also net a 55kW energy surplus.