Below, an IEEE Spectrum article about FACTS, an application of AC technologies.
Here, another piece from the same place — “efficient tempts computer centers to go DC.”
DC distribution’s primary attraction—the promise of simpler equipment and significant energy savings—stems from the increasing proportion of electrical loads with DC-based electronic components or batteries. Distributing DC enables replacement of AC-DC converters within individual devices with a smaller number of larger, more efficient converters.
LED-lighting installations that run on 24-V DC lines, for example, will require up to 15 percent less energy than the same lights running on fixture-level rectifiers, according to the EMerge Alliance.
Losses in the lines limit 24-V DC distribution to 10 meters, so manufacturers are developing 380-V DC wiring to extend similar benefits to entire buildings. Telecommunications firms and data centers are the likely early adopters of 380-V DC.
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This blog has firmly put itself in the column with Thomas Alva Edison. DC power works better than AC power; small local power plants, with the world finding uses for the unused steam that electric power generation wastes.This waste is one big reason why you get 31% to 37% of the actual energy used to generate electricity when you plug something into a receptacle.
[Combined heat-and-power, or CHP, facilities are as much as 70% efficient, Routinely.]