EASAC: Global warming won’t wait until 2050

EASAC (European Academies Science Advisory Council) has taken a position on the ongoing discussion on the revision of the renewable energy directive of the EU. They state that we cannot rely on linear developments and a steady energy transition over the next 30 years to 2050. The overriding principle for a revision must therefore be to strengthen requirements that will maximise reductions in GHG emissions before 2030 by increasing the use of truly no-carbon renewables together with the best energy efficiency measures in these sectors.

global warming
Bild: pixabay

“The IPCC special report has shown that, if GHG emissions are not reduced quickly over the next 10 to 15 years, then the average global temperature will rise above 1.5 to 2 degrees, and the resulting effects on our climate will be disastrous” says William Gillett, EASAC Energy Programme Director: “Of course, researchers will continue to work on what can be done after 2030, but today’s EU energy legislation should have a clear focus on what must be done before 2030.”

The biggest source of GHG emissions in the EU is the use of fossil fuels in industry, buildings and transport. The overriding principle for a revision to the renewable energy directive must therefore be to strengthen requirements that will maximise reductions in GHG emissions before 2030 by increasing the use of truly no-carbon renewables together with the best energy efficiency measures in these sectors. This means:

Embodied carbon

Ambitious targets are needed for the future deployment of renewable energy systems. However, this deployment will produce large quantities of GHG emissions from embodied energy in the materials and components used. Those embodied emissions will come not only from the renewable energy systems, but also from the new infrastructure that they need and from the energy efficiency measures which should accompany their use in buildings, industry and transport. When prioritising revisions to RED II, the aim should therefore be to minimise the cumulative GHG emissions (including embodied emissions) that will be produced during the next 10-15 years.

Bioenergy

So far, certain types of woody biomass have been free-riding on the assumption that all biomass use is carbon neutral. Yet, to contribute to limiting global warming to 1.5 degrees, only biomass resources with carbon payback times of less than 10-15 years should be defined as renewable and made eligible for support or for being counted towards renewable energy targets. This will bring additional benefits by discouraging the burning of whole trees, as recommended in the EU Biodiversity strategy.

Simplification of targets

The multiplication factors and double counting used with targets for renewable transport fuels are confusing. To reduce confusion and help to build public confidence in the use of targets and public funding for renewables, the multipliers and double counting should be replaced by ambitious / meaningful / easy-to-understand sub-sector targets where needed.

Buildings

The current EU definition of nearly zero energy buildings (NZEB) has led to different definitions by Member States across the EU. Unfortunately, the cheapest option to comply, especially for historic buildings, can be to add renewable generators (usually PV) to energy-inefficient buildings instead of performing deep renovations. This option increases renewable energy generation in the summer but does not reduce the total annual thermal energy needs of the building. Moreover, in Northern European buildings, adding PV generators will typically deliver negligible reductions in GHG emissions from space heating systems in winter.

The definition of NZEB should therefore be revised to focus on the annual final energy consumption of the building (kWh/m2.yr), together with the percentages that are supplied by renewable energy, co-generation and waste heat from external sources (such as district heating) and self-consumption. To promote NZEB for the “renovation wave” would then become consistent with promoting deep renovations together with the use of renewable energy, cogeneration and waste heat from external sources and self-consumption.

Integration

The use of renewable energy sources should be optimised by promoting sector coupling, for example by encouraging the intelligent use of excess renewable electricity supplies through heat pumps in district heating and cooling systems.

Energy poverty

This should not be tackled by using public funds to pay high energy bills for low-income households. Instead, public funding should support deep renovations of buildings together with renewable energy supplies. This principle should be more strongly emphasised in the renewable energy directive.

Kategorien

  • Biomasse
  • Energieverbrauch
  • Gebäude
  • Globale Erwärmung
  • Industrie
  • Treibstoffe