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Topic: CDR

[Episode #188] – Getting to a 100% Clean Grid

How much of a role might wind, solar, nuclear, transmission, power plants equipped with carbon capture and sequestration (CCS) technology, or direct air capture of CO2 play on a 100% clean power grid? Which mix of those technologies would provide the cheapest pathways to a clean grid?

And once we have met 90% of the need for grid power with clean generation, what will we need to meet the last 10% of the demand for grid power? Will it be ‘overbuilt’ wind and solar? Dispatchable geothermal, hydropower, and bioenergy generators? Seasonal storage using hydrogen or batteries? Conventional fossil-fueled plants with CO2 capture? Or might it be some mix of flexible demand technologies? Or some or all of the above?

For that matter, how certain can we even be about modeling the possible solutions years or even decades ahead? Are there solutions that might play a large role in the future but that we can’t yet model very well? How confident should we be that whatever the solutions turn out to be, we will end up with not only a grid that is completely free of carbon emissions but also one that is fully reliable?

In this episode, we speak with a senior researcher at the US National Renewable Energy Laboratory (NREL) who has been researching and modeling grid power for many years. In this quite technical discussion, we review two new NREL reports that address these questions and show that producing a 100% clean power grid is not only technically feasible by a variety of pathways but also commercially feasible and ultimately, cheaper than continuing to run the fossil-fueled power grid we have today.

Geek rating: 9


[Episode #173] – IPCC AR6 Part 2

In this second part of our IPCC Sixth Assessment report (“AR6”) Working Group III coverage, we welcome back our friend and AR6 contributing author Glen Peters of the CICERO Center for International Climate Research. Longtime listeners will remember Glen from his explanation of the ‘carbon budget’ in Episode #57, and on the various scenarios for global warming, what they mean, and the current trajectory for climate change in Episode #112.

Glen was a lead author of AR6 Chapter 3, titled “Mitigation pathways compatible with long-term goals,” so in this episode, we discuss the latest figures for the remaining carbon budget; explore the probabilities for limiting warming to 1.5 and 2°C, and we consider the changing views on the role of direct carbon dioxide removal (CDR) and carbon capture and sequestration (CCS) as parts of the climate toolkit. Glen also gives us a very helpful explanation of some of the new terms and metrics used in AR6, such as the Illustrative Mitigation Pathways (IMPs), the warming Classification levels (C1-C8) and the other policy scenarios.

This is super-geeky but essential-to-understand stuff for anyone working on climate policy!

Geek rating: 8