In addition to overhead lines, what other form of transmission is mentioned?

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Power can be transmitted either on overhead lines or underground cables. The form mentioned alongside overhead lines is underground transmission cable, which is buried in the ground rather than suspended on towers. This method is chosen to avoid weather-related outages, reduce land use and visual impact, and meet urban or environmentally sensitive needs. It requires special insulated, high‑voltage cables and often a more complex installation and higher upfront cost, along with considerations for heat dissipation and future access for repairs. The other options don’t fit as standard power transmission methods: undersea cables are for underwater routes, fiber optic cables carry data rather than electrical power, and wireless isn’t used for bulk power transmission.