Local utility requirements must be followed by DOT jurisdictional piping, which includes which companies?

The correct choice highlights the importance of adhering to local utility requirements within the context of DOT (Department of Transportation) jurisdictional piping. Companies such as Con Edison and National Grid are significant players in this sector, providing natural gas and electric services primarily in the New York metropolitan area. These companies are subject to both federal regulations by the DOT and local regulations governing the safe handling and distribution of gas.

Understanding that local utility companies operate under strict guidelines helps ensure safety and compliance with established standards. In the case of Con Edison and National Grid, their involvement means that any gas piping within their jurisdiction must adhere to the specific regulations that are set forth not just by federal agencies like the DOT, but also by state and local authorities to ensure public safety.

The other options present companies involved in the energy sector, but they either serve different regions or do not have the same level of jurisdictional influence in the context of DOT requirements related to gas piping as Con Edison and National Grid.