<Tr> <Td> Tres Amigas </Td> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td> Proposed 2013 </Td> </Tr> <Tr> <Td> Manhattan: Project Hydra </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Proposed 2014 </Td> </Tr> <Tr> <Td> Essen, Germany </Td> <Td> </Td> <Td> 10 </Td> <Td> 0.04 </Td> <Td> 2014 </Td> </Tr> <P> Single - wire earth return (SWER) or single wire ground return is a single - wire transmission line for supplying single - phase electrical power for an electrical grid to remote areas at low cost . It is principally used for rural electrification, but also finds use for larger isolated loads such as water pumps . Single wire earth return is also used for HVDC over submarine power cables . </P>

What is electric power generation transmission and distribution