4.3 CO2 Emissions Reductions - Data Modelling Approach

The approach taken to populate the SEAI gap to target tool is set out in the following project descriptions and the data associated with each type is tabulated in the appendices. A snippet of appendix A is included below.

• Recently Vacated Buildings.

Depending on the energy consumption profile of the vacated building, the contribution of the modelled reductions in CO2 can be significant. Refer to tabulated data set out in appendices A & B.

• In House Energy Management.

City of Dublin ETB have modelled, over the period 2025-2027, an annual 5% reduction in fossil fuel energy with a further 2.5% reduction modelled for the year 2028. In parallel an annual 2.5% reduction in electricity use has been modelled for the years 2025-2028. The contribution that this would make to the 2030 targets when set beside the reductions available through investments required for new build and retrofit projects emphasises the importance of a structured approach to in-house Energy Management to build on the progress already made. Refer to Appendices C for the data set associated with the Scope 1 Energy Management data.

Minor works - active projects.

These are active projects at varying stages of development. They involve identified works to individual or combined fabric elements of a building, such as roof and glazing retrofitting. These measures will deliver important but modest CO2 reductions. All of the projects have been leveraged (further investment required) within the model with further retrofit measures and 80% of the residual heating demand is transitioned to electric heating. All involve a parallel and associated modelling of changes in the profile of our Scope 2 (electric) CO2 emissions.

For the purposes of this roadmap these projects have been modelled in the following 4 step sequence and a typical and associated data set is included at appendix D.

  • ■ Scope 1 CO2 reductions from retrofitting 2 combined fabric elements of a building. (modelled as a 17-28% reduction in Fossil fuel demand).
  • ■ Scope 1 CO2 reductions available through leveraging an active project with further fabric and airtightness improvements to achieve a 40-60% reduction in the original fossil fuel heating demand.
  • ■ Scope 1 CO2 reductions available through transitioning the residual heating demand to a 20/80% split between fossil fuel heating and high efficiency electric heating.
  • ■ A further step, on the Scope 2 side of the model, records the additional Scope 2 CO2 emissions from electricity.