Making the most of waste

The site, based near Wrexham, uses an on-site anaerobic digestion (AD) plant to produce bio-methane from the huge quantity of sewage it treats each year. As well as burning the gas in an on-site Combined Heat and Power (CHP) unit, the company has invested in a gas-to-grid plant.

By blending Calor LPG with its biomethane it can produce gas with a high enough calorific value to qualify for injection into mains gas grid – thereby making a contribution of sustainable energy to thousands of domestic homes and businesses.

This boosts Welsh Water’s commitment to sustainability and helps it keep operational costs down which in turn helps keep bills low for customers.

The tanks remain the property of Calor, meaning that Welsh Water does not need to invest its time or resources into maintenance, and has peace of mind that the equipment is being properly maintained.  

Tanks are fitted with Calor’s automatic top-up system, which regularly monitors gas levels via a contents gauge, and alerts the Calor team when the tank requires a top up so a timely delivery can be scheduled.