In Laos there is a cheap system for electrification to remote area. SWER or Single Wire Earth Return is being used in southern and central part of the country when in the north there is shield wire system.
For more details about SWER you can read from www.ruralpower.org
Comparing the 2 pictures above, the left one is conventional 22 kV distribution system and the right one is 12.7 kV monophase SWER system, which is simplier in construction, fewer components and less cost.
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