The electric utility industry is shifting from large centrally located fossil-fuel generation plants to a more environmentally friendly grid powered by renewable energy sources, such as wind, solar, geothermal and hydropower. While renewables are helping to reduce the industry’s carbon footprint, they bring new issues and challenges, such as the grid itself. Designed more than a century ago, the legacy grid is a patchwork of transmission lines spreading from city to city, but it was
Courtesy of ABB
On the Verge of the Mega Grid
Electric utilities can combine AC and DC networks for a stronger power-delivery system.