给出一些美国俚语，要有详细的来源，发展，用法等介绍，要英文的。。谢谢！！！

The Western USA interconnection (Pacific Intertie)
The AC/DC Pacific Intertie is the largest single electricity transmission program in the United States.

For over 30 years, electricity consumers on the US West Coast have benefited from a power link that allows large amounts of power to be transmitted between the Pacific Northwest and the Southwest. The high-voltage transmission lines that make this power-sharing possible collectively are called the Pacific Intertie.
The Intertie includes three AC lines and one HVDC line. Together, they comprise the largest single electricity transmission program in the United States. The Intertie is capable of transmitting up to 7,900 MW - 4,800 on AC and 3,100 on DC.

Because large amounts of Northwest hydro power can be transmitted reliably to the Southwest, less power has been generated at fossil-fuel power plants - an important benefit in a part of the country with air pollution problems. Conversely, because t