The three-year project is expected to generate a €3.8m annual reduction in energy costs while reducing the network’s energy consumption by 45 million kilowatts a year - enough to power 13,800 homes.

Metro Madrid also anticipates a significant reduction in maintenance costs as each 1.5m-long LED tube has a projected useful life of 7.3 years, compared with 1.5 years for the lights they have replaced.

The project is one of 12 measures in Madrid Metro’s Energy Savings Plan, which has reduced the network’s energy bill by around 25%