sentences:  The M-N Transmission Line begins in Middletown begins at the Scovill Rock Substation in Middletown, and proceeds west to the Beseck Switching Station in Wallingford.From Beseck the transmission line continues southwest to the East Devon Substation by overhead wires supported by 105-foot (35 m) pylons.At East Devon, the line will connect to the nearby Devon Power Station owned by NRG Energy and the Milford Power Company power plant before going underground.