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To: Elroy Jetson who wrote (186366)	11/8/2014 3:04:30 PM
From: Eric	Read Replies (2) of 206330

OT Hi Elroy Jetson, Where did you get the idea that electrical transmission loses a lot of energy? Electrical Transmission which loses a huge percentage of the electricity generated as heat. Transmission losses could theoretically be reduced with superconducting transmission wires. Waste heat from electrical generation is already close to theoretical minimums, using massive turbines operated at optimum speed. The HV AC transmission lines from Grand Coulee Dam in Eastern Washington loses about 4% of it's energy by the time it gets to my neighborhood substation here in the Seattle area. That's about 170 miles of high voltage transmission line. And that includes the losses in in both the "step up" transformers at the beginning of the path and the "step down" transformers at our nearby substation. Even better is HVDC which feeds from the Columbia River all the way down to Southern California: en.wikipedia.org HVDC is more economical than AC transmission for transmitting large amounts of power over long distances. High power HVDC transmission scheme generally has lower capital costs and lower losses than AC transmission at long distances.HVDC conversion equipment at the terminal stations is costly but the transmission line costs over long distances are lower. HVDC requires less conductor per unit distance than an AC line, as there is no need to support three phases and there is no skin effect. Depending on voltage level and construction details, HVDC transmission losses are quoted as about 3.5% per 1,000 km, which is less than typical AC transmission losses. [16] en.wikipedia.org Some of my old classmates in EE at WSU in the early 1970's still work on the system today improving its efficiency and reliability. It has about one half to one third of the loss compared to the AC intertie going south. Both systems are bi directional, power can go north and south when needed. Eric

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