The IEA’s World Energy Outlooks have no doubt that electrification alone cannot meet our climate goals. That’s why natural gas continues to play a major role. But biogas and biomethane have the potential to replace 20% of that gas, says the IEA’s special report “Outlook for biogas and biomethane: Prospects for organic growth”. At present only a fraction of that is being utilised. Here the IEA summarises their comprehensive report. Costs are the issue. They vary widely as every nation’s ability to process these biogases are different. But even today around 30 Mtoe of biomethane – mostly landfill gas – should be able to undercut the domestic price of natural gas. Meanwhile advances in technology, agriculture, transport and waste management will bring costs down. Policy coordination across these otherwise unconnected sectors is needed. The upside is that biogases can use the existing natural gas infrastructure, and are produced from organic residues and wastes so they’re an energy source available to most parts of the world. The full report includes a detailed assessment of feedstock availability and production costs across all regions of the globe.
This report provides estimates of the sustainable potential for biogas and biomethane supply, based on a detailed assessment of feedstock availability and production costs across all regions of the world. These form the basis of an outlook for biogas and biomethane supply and demand up to 2040, based on the scenarios presented in the annual World Energy Outlook.
Key focus areas include how big a role these gases can play in the transformation of the global energy system, where the opportunities and potential pitfalls lie, and what policy makers and industry can do to support sustainable growth in this sector.
Utilising rising amounts of organic waste
The case for biogas and biomethane lies at the intersection of two critical challenges of modern life: dealing with the increasing amount of organic waste that is produced by modern societies and economies, and the imperative to reduce global greenhouse gas (GHG) emissions.
By turning organic waste into a renewable energy resource, the production of biogas or biomethane offers a window onto a world in which resources are continuously used and reused, and one in which rising demand for energy services can be met while also delivering wider environmental benefits.
In assessing the prospects for “organic growth” of biogas and biomethane, this new report from the International Energy Agency (IEA) explores how big a role these gases can play in the transformation of the global energy system, where the opportunities and potential pitfalls lie, and what policy makers and industry can do to support sustainable growth in this sector.
The answers to these questions rest on a major new IEA analysis of the sustainable potential for biogas and biomethane supply, including a detailed assessment of feedstock availability and production costs across all regions of the world.
Nations’ needs will vary
This provides a platform to explore the various services that biogas and biomethane can provide in different countries, which vary widely depending on circumstances and policy priorities. Biogas can be a valuable local source of power and heat, as well as a clean cooking fuel to displace reliance on the traditional use of solid biomass in many developing countries. There are also potential co-benefits in terms of agricultural productivity (as a result of using the residual “digestate” from biodigesters as a fertiliser) and reducing deforestation.
Upgraded biomethane can use natural gas infrastructure
When upgraded, biomethane (also known as renewable natural gas) is indistinguishable from natural gas and so can be transported and used in the same way. Biomethane can deliver the energy system benefits of natural gas while being carbon-neutral.
The value of biogas and biomethane is heightened in scenarios such as the IEA Sustainable Development Scenario (SDS), which meet in full the world’s goals to tackle climate change, improve air quality and provide access to modern energy. Projections from the SDS provide an essential benchmark for much of the discussion in this report.
Biogas and biomethane have the potential to support all aspects of the SDS, which charts a path fully consistent with the Paris Agreement by holding the rise in global temperatures to “well below 2°C … and pursuing efforts to limit [it] to 1.5°C”, and meets objectives related to universal energy access and cleaner air.
The other scenario referenced in the analysis is the Stated Policies Scenario (STEPS), which provides an indication of where today’s policy ambitions and plans, including national policy announcements and pledges, would lead the energy sector.
Comparison between the outcomes in these two scenarios provides an indication of the range of possible futures that are open to biogas and biomethane, and the policy and technology levers that will affect which pathway they ultimately follow.
1. Biogas and biomethane producers take organic residues and wastes and turn them into a valuable modern source of clean energy
Modern societies and economies produce increasing amounts of organic waste that can be used to produce clean sources of energy, with multiple potential benefits for sustainable development.
Biogas and biomethane are different products with different applications, but they both originate from a range of organic feedstocks whose potential is underutilised today. The production and use of these gases embody the idea of a more circular economy, bringing benefits from reduced emissions, improved waste management and greater resource efficiency. Biogas and biomethane also provide a way to integrate rural communities and industries into the transformation of the energy sector.
2. The feedstocks available for sustainable production of biogas and biomethane are huge, but only a fraction of this potential is used today
A detailed, bottom-up study of the worldwide availability of sustainable feedstocks for biogas and biomethane, conducted for this report, shows that the technical potential to produce these gases is huge and largely untapped.
These feedstocks include crop residues, animal manure, municipal solid waste, wastewater and – for direct production of biomethane via gasification – forestry residues.
This assessment considers only those feedstocks that do not compete with food for agricultural land.
Biogas and biomethane production in 2018 was around 35 million tonnes of oil equivalent (Mtoe), only a fraction of the estimated overall potential. Full utilisation of the sustainable potential could cover some 20% of today’s worldwide gas demand.
3. Possibilities to produce biogas and biomethane are widely distributed around the world
Every part of the world has significant scope to produce biogas and/or biomethane, and the availability of sustainable feedstocks for these purposes is set to grow by 40% over the period to 2040.
The largest opportunities lie across the Asia Pacific region, where natural gas consumption and imports have been growing rapidly in recent years, and there are also significant possibilities across North and South America, Europe, and Africa. The overall potential is set to grow rapidly over the next two decades, based on increased availability of the various feedstocks in a larger global economy, including the improvement in waste management and collection programmes in many parts of the developing world.
4. Biogas offers a local source of power and heat, and a clean cooking fuel for households
Biogas is a mixture of methane, CO2 and small quantities of other gases that can be used to generate power and to meet heating or cooking demand.
Its uses and competitiveness depend on local circumstances, but a common element is that biogas offers a sustainable way to meet community energy needs, especially where access to national grids is more challenging or where there is a large requirement for heat that cannot be met by renewable electricity.
In developing countries, biogas reduces reliance on solid biomass as a cooking fuel, improving health and economic outcomes. In the SDS, biogas provides a source of clean cooking to an additional 200 million people by 2040, half of which in Africa.
Biogas can also be upgraded to produce biomethane by removing the CO2 and other impurities.
5. When upgraded, biomethane brings all the energy system benefits of natural gas without the associated net emissions
Biomethane is a near-pure source of methane produced either by “upgrading” biogas or through the gasification of solid biomass; since it is indistinguishable from the regular natural gas stream, it can be transported and used wherever gas is consumed, but without adding to emissions.
Biomethane grows rapidly in IEA scenarios. It allows countries to reduce emissions in some hard-to-abate sectors, such as heavy industry and freight transport. It also helps to make some existing gas infrastructure more compatible with a low-emissions future, thereby improving the cost-effectiveness and security of energy transitions in many parts of the world.
Biomethane in the SDS avoids around 1,000 million tonnes (Mt) of GHG emissions in 2040. This includes the CO2 emissions that would have occurred if natural gas had been used instead, as well as the methane emissions that would otherwise have resulted from the decomposition of feedstocks.
6. Most of the biomethane potential is more expensive than natural gas, but the cost gap narrows over time
With the exception of some landfill gas, most of the biomethane assessed in this report is more expensive than the prevailing natural gas prices in different regions.
The average price for biomethane produced today is around USD 19 per million British thermal units (MBtu), with some additional costs for grid injection. However, this report estimates that around 30 Mtoe (~40 billion cubic metres [bcm]) of biomethane – mostly landfill gas – could be produced today at a price that undercuts the domestic price of natural gas; this is already ten times more than total biomethane consumption today.
The cost gap is projected to narrow over time as biomethane production technologies improve and as carbon pricing in some regions makes natural gas more expensive. Recognition of the value of avoided CO2 and methane emissions goes a long way towards improving the cost-competitiveness of biomethane.
7. Low-carbon gases are essential to energy transitions; supportive policies are required to unlock the potential for biogas and biomethane
Multiple fuels and technologies will be required to accelerate energy transitions, and low-carbon gases – led by biomethane and low-carbon hydrogen – have critical roles to play.
The 20% share of electricity in global final consumption is growing, but electricity cannot carry energy transitions on its own against a backdrop of rising demand for energy services.
Biomethane is the largest contributor to low-carbon gas supply in the time horizon of the World Energy Outlook (WEO) Scenarios. How the biogas and biomethane industry evolves will vary by country depending on the sectoral focus, feedstock availability, prevailing market conditions and policy priorities.
In all cases, however, realising the multiple benefits of biogas and biomethane requires co‑ordinated policy-making across energy, transport, agriculture, environment and waste management.
This article is taken from the IEA Newsroom
Rex Berglund says
“The cost gap is projected to narrow over time as biomethane production technologies improve and as carbon pricing in some regions makes natural gas more expensive.”
To the extent that the biomethane is used for electrical generation, this would be a useful dispatchable source to bolster solar and wind on the grid. Further, there is an opportunity to actually make the process carbon negative, using Allam cycle turbines to capture CO2 then sequestering it. Since we will tax carbon emissions, it’s reasonable to subsidize CCS, thus improving the economics.
Reynier Funke says
Sorry to spoil the Party. Biogas production costs have not dropped the past 10 years, and will not in the future! Why? Biogas is produced in tanks, connected by piping and moved and agitated by pumps and other machinery. Tanks, pipes and such machinery have been used in other contexts for over a century, their costs have been reduced to the bottom already and rather tend to go up with inflation. The same is true for feedstock, logistics costs etc. This is different from wind or solar, whose costs, although at a slower rate the past years, still continue to drop. So if Biogas is to have a role, the policies must direct from energy to other benefits, such as organic rather than fossile fuel based fertilizers. Biogas may be able to substitute some of the natural (sorry fossile) gas, but the market price difference is still a factor 3 to 6. It will require CO2 taxation of at least 200 €/t CO2 to put them at par. Due to Corona and the “Opec-USA oil-war”, there is a window of opportunity to introduce drastic CO2 taxes without too much immediate pain. Politicians could win support by first dropping taxation on electricity (notably if green) as this will lower the power bill during Corona. Once we are through the Corona crisis, a more costly fossile fuels may be accepted. But I have not heard any politician (except Mr. Söder) thinking about such policies.