How modular renewables can reduce the costs of relying on carbon capture

COP29 must raise countries’ ambitions to deploy vastly more low-cost modular renewable technologies to help meet the tripling of renewables target set at COP28 and reduce our reliance on expensive carbon capture systems.

Expert comment Updated 29 November 2024 3 minute READ

The most important international climate conference is around the corner. COP29 in Baku, Azerbaijan will be especially important because next year countries will submit their five-yearly national climate plans – or Nationally Determined Contributions (NDCs) – as set out under the Paris Agreement.

At COP28 in Dubai last year, the final text was heralded as a last-minute success as – somewhat surprisingly – it was the first ever COP to commit to ‘transition away from fossil fuels in energy systems in a just, orderly and equitable manner’. To support this, over 200 countries also committed to triple renewable capacity by 2030.

Under current NDCs, even if all countries achieve their most ambitious decarbonization plans, the world would still fall 30 per cent short of tripling renewable capacity by 2030. 

At COP29 in November, hosted by a petrostate, additional agreement is needed to operationalize the removal of fossil fuels from the global energy system and set the ambition for those crucial NDCs in 2025. Failing to do so means the opportunity to triple renewables by 2030 will slip away. But the actions of oil producing nations, international oil companies, their associated supply chains and networks of lobbyists have in recent years done their best to disrupt and slow down the energy transition and water down key negotiations during COPs and elsewhere

During the final days of COP28, the Organization of the Petroleum Exporting Countries (OPEC) sent private letters to its 13 members – including COP28 host the United Arab Emirates (UAE) – urging them to ‘proactively reject any text or formula that targets energy, i.e. fossil fuels, rather than emissions’. OPEC members own 80 per cent of global oil reserves.

Due to the startling decline in the cost of renewables and electric vehicles, fossil fuel producers are increasingly concerned. To fight back they are turning to carbon capture and storage (CCS) technologies and carbon removal options, which would enable the continued burning of fossil fuels – and protect their assets and business models.

A key battle ground for oil and gas producers is the difference between abated and unabated fossil fuels.

Abatement is the process of capturing CO2 as fossil fuels are burnt to prevent a proportion of those CO2 emissions from entering the atmosphere, either by using that CO2 in products or storing it in geological formations deep underground in near perpetuity, commonly referred to as CCS.

After COP28 there was optimism that the final agreement was significant and covered all fossil fuels without ambiguity around whether they are unabated or abated. 

But the definition of unabated has not actually been agreed within the COP process. During the 2021 COP26 summit, the Glasgow Climate Pact mentioned unabated in reference to coal. Could a gas power station capturing 51 per cent of the emitted CO2 be considered abated?

And what about the so-called downstream emissions? Downstream emissions from cars, planes, tanker ships and diesel generators etc make up 50–80 per cent of the total emissions from oil – and there are no plans to attach mini-CCS systems to cars.

CCS and engineered carbon removals are also likely to be expensive. Analysis by the Oxford Smith School of Enterprise and the Environment has shown that high CCS pathways to net zero emissions in 2050 would cost at least $30 trillion more than a low CCS pathway with more renewables – roughly $1 trillion more per year. In a Chatham House paper, carbon removals are shown to cost an additional $192–315 billion per year, and could be as high as half a trillion dollars per annum.  

The costs of CCS have also remained the same for the past 40 years, while the costs of renewables like solar, wind and lithium-ion batteries have dropped radically. Solar costs have declined by 90 per cent in the last decade

The rapid cost reductions of solar, wind and batteries are due to their modular nature. Around 70 billion solar cells will be manufactured this year, the majority in China. It is the repetitive modular manufacturing process that has led to rapid efficiency improvements and cost reductions. Each Tesla has around 7,000 lithium-ion battery cells, and the price of these modular batteries fell 14 per cent between 2022 and 2023 alone. 

The rapid cost reductions of solar, wind and batteries are due to their modular nature.

The modular criteria can help define the technology winners of the future, technologies we should selectively support and accelerate over the coming years. 

While huge industrial power stations, oil rigs and refineries have their benefits, they are not modular in the same way. Their economy of scale is in the large size of each asset. CCS is bolted on to fossil fuel infrastructure but there are less than 50,000 fossil fuel producing assets globally. By contrast, there were 1.5 billion solar panels produced in 2022. The cost of deploying CCS is therefore unlikely to benefit from the rapid cost reductions of modular renewables. Nuclear even less so. There are 440 nuclear power stations in operation today, they take many years to build and remain hugely expensive. 

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In the context of high debt-to-GDP levels across many countries and military spending on the rise in a conflict-focused world, the risk is that the costs of CCS and engineered carbon removals increasingly become incommensurate with today’s focus on energy security and affordability.

To have any chance of avoiding climate change catastrophe, we have to prioritize the quickest way to mitigate the largest emissions.

Modular renewable technologies can be deployed faster to reduce our reliance on expensive CCS and carbon removal technologies. There are also other modular renewable technologies, such as heat pumps and electrolysers, that are already starting to disrupt parts of the energy system but require additional government help to speed their modular journey along. 

To have any chance of avoiding climate change catastrophe, we have to prioritize the quickest way to mitigate the largest emissions. At COP29, a priority must be to increase the ambition of countries to accelerate low-cost modular renewables within their 2025 NDCs. This will not only help meet the COP28 target of tripling renewables by 2030 but will also help reduce the future costs of relying on expensive CCS and carbon removal technologies.