Electricity transmission cannot be tendered for the following reasons:  Nature of infrastructure: Electricity transmission networks, such as power lines and transformers, are expensive and require extensive physical infrastructure to be built and maintained. Often these networks belong to regional network companies, which are responsible for the distribution and transmission of electricity in a certain area.  Natural monopoly position: The nature of electricity transmission networks creates a natural monopoly where one grid company can provide efficient and economically sustainable electricity transmission in a given area.  Regulation: Electricity transmission is a heavily regulated activity, and the operation of network companies is subject to precise regulations and supervision. Regulation helps ensure that electricity transmission networks are reliable, safe and fair for all customers.