Transjakarta or Jakarta BRT is a bus rapid transit (BRT) system in Jakarta, Indonesia. The first BRT system in Southeast Asia, it commenced operations on 15 January 2004 to provide a fast public transport system to help reduce rush hour traffic. The system is considered as the first revolutionary public transit mode in the capital city of Indonesia. The buses run in dedicated lanes (busways), and ticket prices are subsidised by the regional government. Transjakarta has the world's longest BRT system, which operates about 4,300 buses. Transjakarta aims to have 50 percent of its fleet be electric buses by 2027. By 2030, the aim is for the entire Transjakarta ecosystem to use electric buses. As of November 2023, it serves an average of 1.134 million passengers daily.

An electric bus is a bus that is propelled using electric motors, as opposed to a conventional internal combustion engine. Electric buses can store the needed electrical energy on board, or be fed mains electricity continuously from an external source such as overhead lines. The majority of buses using on-board energy storage are battery electric buses, where the electric motor obtains energy from an onboard battery pack, although examples of other storage modes do exist, such as the gyrobus that uses flywheel energy storage. When electricity is not stored on board, it is supplied by contact with outside power supplies, for example, via a current collector, or with a ground-level power supply, or through inductive charging.