Why not using existing rights of way, following electric transmission lines or along highways?
We prefer to co-locate with existing rights of way where possible, but oftentimes it is not feasible. For example, electric transmission lines can traverse steep terrain in ways pipelines cannot. In addition, there often is not enough room along highway rights of way or there are other restrictions.
Electric power rights-of-way, depending on the voltage of the overhead lines, the cross-connections, and the height of the power lines (lowest point) can generate difficult underground voltages (corrosion and static voltages both) in pipelines that are parallel to the power lines.
Even if you “absolutely have to cross” the pipeline easement with the high voltage easement, you get construction problems, the galvanic corrosion and induced static charges, a nd the “parallel path” hills problem during construction.
Best to keep them separate. Or cross perpendicular to the other line.