Transmission Infrastructure

Introduction

In an electricity grid, power needs to be transmitted from where it is generated to where it is used.

This requires the development of transmission infrastructure encompassing the physical equipment and systems used for the transmission of electric power at high voltages over long distances. In substations, the electricity is then reduced to lower voltages for distribution and utilisation by private, public, and industrial customers. Transmission infrastructure includes, i.e., power lines, poles, lines, towers, converters, transformers and substations.

Conventional power grids, which produce electricity in large quantities and deliver it in a one-way direction to different users, are facing the challenge of integrating an increasing share of distributed and often intermittent renewable energy sources. It is therefore necessary for them to become more efficient and intelligent (i.e. 'smart').

Transmission Infrastructure Types

There is a range of different transmission types with different characteristics, including:

• construction methods
• operation and maintenance needs
• environmental and land use impacts

Onshore Transmission Infrastructure

Transmission infrastructure can be deployed in two main ways: as overhead lines, which consist of conductors suspended on poles or towers and which carry high-voltage electricity from power plants to substations and homes; and as underground cables, which are mostly used in urban areas.

Offshore Transmission Infrastructure

An offshore transmission system is a network of (subsea) cables that connect offshore turbines to offshore and onshore substations. Subsequently, the substations are connected to the existing energy grid.

Further Information

• Grid Portal on energypedia