The Ports to Plains corridor is not a multi-modal corridor, except, as the article points out, it will be used as a right of way to bring the wind power down from the panhandle.
An item of interest: Sharyland Utilities is the company that will build the Panhandle Loop to gather the wind power there and bring it to the Texas grid via the Ports to Plains. Today, it was announced that FERC had OKed Sharyland and another company to connect the Texas grid and the Mexican grid for the commercial transfer of power.
Why is a road needed to transmit power?