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Renewable energy

Energy self-generated

Energy self-generated - This measures the percentage of our electricity and gas use that is accounted for by our own renewable generation. 

We are targeting an increase in the amount we generate over time, although this is mitigated by a heightened demand for power as we deliver other enhancements (e.g. the integrated supply grid). The target profile is 21% in 2015-16 rising to 22% in 2016-17 and 2017-18, before falling to 21% in 2018-19 and rising again to 24% in 2019-20. The profile varies in the AMP period because of the integrated supply grid coming on stream mid AMP and anticipated increases in self-generation from sludge schemes at the end of the price control period.

If we miss the target in any year we will refund customers £99k for every percentage we are below this target. 

Our renewable electricity generation came to 25%, better than our performance commitment. The renewable energy in this calculation includes:  

  • Electricity from combined heat and power fueled by sewage sludge biogas  
  • Exported biomethane expressed as the electricity that it would have produced if the source biogas had been converted into electricity instead 
  • Electricity from hydropower installations 
  • Renewable electricity from other on-site generation that is consumed by a regulated activity (i.e. water treatment, distribution, sewerage, sewage treatment or sludge treatment). In our case this includes electrical output of food waste digestion and solar power. 

The denominator for this performance commitment is total electricity demand. We use electricity as the single common unit and purposefully avoid combining electrical and thermal energy output, which could lead to confusion and disparities. 

We anticipate delivering the target in 2019-20.