Once operational, the facility will generate up to 60 GWh of renewable energy annually, enough to meet the energy requirements of approximately 11,700 households or 30,000 residents.

The plant will process up to 75,000 tonnes of organic waste each year, including separately collected household biowaste from Colmenar Viejo and surrounding municipalities. Rather than being sent to landfill, the organic material will be converted into renewable biomethane.

At the heart of the facility will be three stainless-steel digesters supplied by WELTEC BIOPOWER. Each digester measures 25.34 metres in diameter and 10.05 metres in height, with a capacity of 5,067 cubic metres. A gas-tight pre-storage tank will help maintain a continuous substrate supply and stable operating conditions.

“Stainless steel is particularly resistant to corrosion under the demanding biological and chemical conditions found in the digestion process. This gives the plant a long service life, high operational reliability and low maintenance requirements,” said Alain Priser, International Sales Manager at WELTEC BIOPOWER.

The facility will operate as a closed and sealed system, with biofilters and activated carbon systems designed to remove up to 99% of odorous substances from exhaust air. The resulting biomethane will be injected directly into the gas grid.

The project is expected to contribute to Madrid's efforts to reduce landfill use while converting regional organic waste into locally produced renewable energy.

WELTEC BIOPOWER will provide further information about the technology at stand 276A at Salon del Gas Renovable in Valladolid, 29–30 September 2026.