Co-locating DAC and PV or concentrated solar with commercial-scale, marine microalgae production facilities would provide onsite supply of electricity and CO2 without the release of any additional emissions of fossil carbon. In addition to producing fossil carbon-neutral liquid fuels and nutritional products from the microalgae, the production of plastics and other biopetroleum products for the human-built environment could lock up carbon while generating revenue. This might be preferable to DAC and subsequent carbon sequestration in geological repositories. The market for carbon-negative biopetroleum products is not of sufficient scale at present to create a large dent in the amount of carbon that will need to be stored. However, the infrastructure required for the human-built environment is enormous, and we would just need to be clever in how we substitute materials.
> On Sep 17, 2017, at 1:49 PM, Peter Eisenberger <[email protected]> > wrote: > > I agree with this 100% > > On Sun, Sep 17, 2017 at 7:14 AM, Michael MacCracken <[email protected] > <mailto:[email protected]>> wrote: > A problem at present is that present high-voltage/alternating current > distribution lines mean that low-cost transmission of electricity is limited > to a few hundred miles, so one would have to disperse DAC. If instead there > were large-scale high-voltage/direct current distribution lines (see > MacDonald et al., Nature, January 2016), then there could be long distance, > low-cost transmission over large distances and one would have a much better > likelihood of having access to any stranded energy (from wind, solar, > geothermal, nuclear, etc.), all while having DAC located where it would be > optimally able to store the captured carbon. Just another reason, among many, > for having large-scale HV/DC networks across the world's continents. > Mike MacCracken > > On 9/17/17 10:50 AM, Hawkins, Dave wrote: >> Using stranded renewable energy for DAC is an interesting idea. Question is >> what energy resource will be used during periods when there is no surplus >> RE? If DAC does not run 24/7 its costs go up. If DAC uses RE to run 24/7, >> that requires a larger RE system with associated stranding. If DAC uses >> something other than RE, what is it? Ideally, we would have an economically >> dispatchable zero-carbon resource. >> This is not an argument against DAC, just an observation on system >> complexity. >> >> Sent from my iPad >> >> On Sep 17, 2017, at 3:58 AM, Andrew Lockley <[email protected] >> <mailto:[email protected]>> wrote: >> >>> Does anyone have a breakdown of projected input costs for Direct Air >>> Capture? I'm interested in quantifying the energy component. >>> >>> Swanson's law predicts reliable falls in the cost of solar. Without >>> storage, much peak-time solar could be wasted, unless it's used for >>> time-insensitive applications like DAC or desalination. >>> >>> (I understand Keith's process needs electricity, but Lackner's instead >>> needs heat.) >>> >>> My hypothesis is that DAC could become vastly cheaper, if energy costs >>> trended down as expected due to Swanson's law, and cheaper still if it >>> became a way to use this stranded energy. >>> >>> I'd welcome thoughts, data, projections and comments. >>> >>> Thanks >>> >>> Andrew Lockley >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "geoengineering" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected] >>> <mailto:[email protected]>. >>> To post to this group, send email to [email protected] >>> <mailto:[email protected]>. >>> Visit this group at https://groups.google.com/group/geoengineering >>> <https://groups.google.com/group/geoengineering>. >>> For more options, visit https://groups.google.com/d/optout >>> <https://groups.google.com/d/optout>. >> -- >> You received this message because you are subscribed to the Google Groups >> "geoengineering" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] >> <mailto:[email protected]>. >> To post to this group, send email to [email protected] >> <mailto:[email protected]>. >> Visit this group at https://groups.google.com/group/geoengineering >> <https://groups.google.com/group/geoengineering>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/geoengineering > <https://groups.google.com/group/geoengineering>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. > > > > -- > CONFIDENTIAL INFORMATION: This email message and all attachments contain > confidential and privileged information that are for the sole use of the > intended recipients, which if appropriate applies under the terms of the > non-disclosure agreement between the parties. > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/geoengineering > <https://groups.google.com/group/geoengineering>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. 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