that the turbine rotation speed can vary while connected to an electric power distribution grid. Linden VFT General Electric installed a 3 × 100 MW VFT substation in Linden, New Jersey, in the United States in 2009. It connects the power systems of PJM & New York Independent System Operator (NYISO). This installation is in parallel with three existing phase-shifting transformers to regulate synchronous power flow. Economics of energy trading VFTs provide the technical feasibility to flow power in both directions between two grids, permitting power exchanges that were previously impossible. Energy in a grid with lower costs can be transmitted to a grid with higher costs (higher demand), with energy trading. Power capacity is sold by providers. Transmission scheduling rights (TSRs) are auctioned by the transmission line owners. Financial transmission rights (FTRs) are a financial instrument used to balance energy congestion and demand costs. See also Induction regulator References External links Power Transmission Without the Power Electronics Electric power infrastructure Electric transformers