The “Sonnae Power Station” has been generating electricity for decades.
It was built by the Pak Tu Son Aeguk Car Service Company by using the water flowing through the sewerage system.
The volume of underground water flowing along the sewerage system in Sonnae-dong, Mangyondae District, Pyongyang, where the company is headquartered, was not small and it often rose in the rainy season.
The company saw that it could build a small power station if it exploited underground water.
It was also vital for keeping the surrounding environment clean.
The employees made the blades of a small turbine by grinding those of the cooling fan of a junk car and the generator by remodelling an old bus engine. And they recycled discarded batteries. They also used the steering wheel of a scrapped car as a regulator to control the water volume.
The company neatly rearranged the water pool it had used as a waste dump to turn it into an additional reservoir for the power station.
According to Ri Kyong Su, a section chief of the company, if they store water from the sewers in the reservoir and send it out hourly, they can generate 3.4 kWh electricity at a time.
The company charges it up to 15kW and supplies it to necessary lighting and electric facilities.
Car batteries are also recharged using this electricity.
“The power station was built long ago, so a large amount of mud accumulated on the inlet of waste water. As a result, the water current got slower and water head was lowered, with power output dwindling gradually,” said director Ri Jong Ryong.
Last year the company removed all the mud which had been collected for a long time and turned the inlet area of waste water into a fish farm.
And it built a several hundred metres long drainage ditch to make the water of the fish breeding ponds flow into it via the settling reservoirs and turn the generating turbines, falling from the place with a 2 metre-high head of water.
As the water head grew higher and the speed of water current in the drainage ditch got faster, power generation has increased far more than before.
The company arranged the settling reservoirs in several stages and planted Elaeagnus crispa Thunb, black chokeberry and other trees around fish breeding ponds.
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