The main greenhouse gases that we emit are:
- carbon dioxide from energy and transport
- methane from water recycling (sewage treatment) and sludge reuse
Our net greenhouse gases fell to 117 kilotonnes carbon dioxide equivalent in 2019-20. This is the lowest level since 1999-2000 and we met our performance commitment for the year. We are continuing to target lower annual emissions and have committed to net-zero carbon emissions by 2030 along with the rest of the Water industry. The target is a challenge, partly because increasing treatment standards require more energy intensive methods.
To help address this increased energy consumption, we have a carbon management strategy including energy avoidance, efficiency projects and renewable energy.
The value of carbon we report to our regulator Ofwat excludes emissions from sludge on farmland. Net emissions also subtract the renewable electricity that we export multiplied by the UK average emissions factor for grid electricity.
The emissions from the production of chemicals that we use are also estimated but our estimate of 9 kilotonnes of CO2 does not include the emissions from transporting them to our sites.