Contracting entities in the sectors of transport or distribution of gas or heat
Contracting entities in the sectors of production, transport or distribution of electricity
Contracting entities in the sectors of production, transport or distribution of drinking water
Contracting entities in the field of urban railway, tramway, trolleybus or bus services
Contracting entities in the sectors of exploration for and extraction of oil or gas
Contracting entities in the sectors of exploration for and extraction of coal and other solid fuels
Contracting entities in the field of maritime or inland port or other terminal facilities
Central government authorities