Looking at low indirect greenhouse gas emissions
Potsdam Institute for Climate Impact Research
(PIK)
Different low carbon technologies from
wind or solar energy to fossil carbon capture and sequestration (CCS) differ
greatly when it comes to indirect greenhouse gas emissions in their life cycle. This is the result of a comprehensive new study conducted by an international team of scientists that is now published in the journal Nature Energy. Unlike what some critics argue, the researchers not only found that wind and solar energy belong to the more favorable when it comes to life-cycle emissions.
They also show that a full decarbonization of the global power sector by scaling up these technologies would induce only modest indirect greenhouse gas emissions – and hence not impede the transformation towards a climate-friendly power system.
“Both fossil and non-fossil power technologies still come with a
certain amount of greenhouse gas emissions within their life cycle – on the one
hand because it needs energy to construct and operate them, on the other hand
because of methane emissions, e.g. from coal and gas production,” explains lead
author Michaja Pehl.
“However, we found there are substantial differences across technologies regarding their greenhouse gas balance. Electricity production from biomass, coal, gas and hydropower for instance induces much higher indirect greenhouse gas emissions than nuclear electricity, or wind and solar-based power supply.”
“However, we found there are substantial differences across technologies regarding their greenhouse gas balance. Electricity production from biomass, coal, gas and hydropower for instance induces much higher indirect greenhouse gas emissions than nuclear electricity, or wind and solar-based power supply.”
With their study the researchers provide an innovative and comprehensive global analysis of embodied energy use and indirect greenhouse gas emissions – from all relevant power sector technologies. For the first time, their study combines the strengths of simulations based on integrated energy-economy-climate models that estimate cost-optimal long-term strategies to meet climate targets with life cycle assessment approaches.
So far, these research branches have operated separately. Exploring the life cycle emissions of future low-carbon supply systems and the implications for technology choices, they found that fossil power plants equipped with CCS will still account for life-cycle emissions of around 100 grams of CO2-equivalents per kWh of electricity produced, ten times more than the around 10 grams of CO2-equivalents for wind and solar power they project for 2050 in a climate protection scenario in which power production is almost completely decarbonized.
Wind and solar provide a much better greenhouse gas emissions
balance than fossil-based technologies
“There is no such thing as truly clean coal. Conventional coal
power currently comes with around 1000 grams of CO2-equivalents
per kWh. Capturing CO2 from coal plants can reduce
emissions per kWh by around 90 percent, but substantial life-cycle greenhouse
gas emissions remain,” says Gunnar Luderer, energy system analyst from PIK and
project leader.
“To keep global warming below 2°C, however, virtually carbon free electricity is necessary. This makes it increasingly implausible that coal power will play a major role in the future, even if equipped with CO2 scrubbers.”
“To keep global warming below 2°C, however, virtually carbon free electricity is necessary. This makes it increasingly implausible that coal power will play a major role in the future, even if equipped with CO2 scrubbers.”
“When it comes to life cycle greenhouse gas emissions, wind and
solar energy provide a much better greenhouse gas balance than fossil-based low
carbon technologies, because they do not require additional energy for the
production and transport of fuels, and the technologies themselves can be
produced to a large extend with decarbonized electricity,” states Edgar
Hertwich, an industrial ecologist from Yale University who co-authored the
study.
Due to technological innovation, less and less energy will be needed to produce wind turbines and solar photovoltaic systems.
Due to technological innovation, less and less energy will be needed to produce wind turbines and solar photovoltaic systems.
“Some critics have argued renewable energies could come with high
hidden greenhouse gas emissions that would negate their benefits to the
climate. Our study now shows that the opposite is true,” concludes Luderer.
“During the transition to clean power supply, the additional life-cycle emissions for building up wind and solar capacities are much smaller than the remaining emissions from existing fossil power plants before they can finally be decommissioned. The faster the low-carbon transformation of power supply is accomplished, the lower is the overall remaining carbon burden for the climate.”
Article: Michaja Pehl, Anders Arvesen, Florian Humpenöder, Alexander Popp, Edgar Hertwich, Gunnar Luderer (2017): Understanding Future Emissions from Low-Carbon Power Systems by Integration of Lice Cycle Assessment and Integrated Energy Modelling. Nature Energy. [DOI: 10.1038/s41560-017-0032-9]
Weblink to the article once it is published: https://www.nature.com/nenergy/
“During the transition to clean power supply, the additional life-cycle emissions for building up wind and solar capacities are much smaller than the remaining emissions from existing fossil power plants before they can finally be decommissioned. The faster the low-carbon transformation of power supply is accomplished, the lower is the overall remaining carbon burden for the climate.”
Article: Michaja Pehl, Anders Arvesen, Florian Humpenöder, Alexander Popp, Edgar Hertwich, Gunnar Luderer (2017): Understanding Future Emissions from Low-Carbon Power Systems by Integration of Lice Cycle Assessment and Integrated Energy Modelling. Nature Energy. [DOI: 10.1038/s41560-017-0032-9]
Weblink to the article once it is published: https://www.nature.com/nenergy/