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DanielleFong's profile
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@DanielleFong

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Empire of the Future
Joined February 2008

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    1. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      2. Long duration storage needs to be cheap. At energy capacity cost of <=$50/kWh, LDES would see initial deployment and would reduce required firm generation capacity by 5-10%. Many developers are targeting lower energy capacity costs (e.g. ARPA-E DAYS focuse on $5-20/kWh range).pic.twitter.com/ze3TcIBskE

      1 reply 0 retweets 17 likes
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    2. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      3. LDES is likely to be a partial substitute for clean firm generation. Given today’s electricity demand patterns, displacing all firm power with LDES requires energy storage capacity cost of <$1/kWh, + very low power capacity costs (<$300/kW) + round-trip efficiency >60%.pic.twitter.com/HOMAAHP6Kx

      1 reply 0 retweets 17 likes
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    3. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      3b. Electrification of other energy uses makes it more difficult for LDES to substitute firm generation capacity. It will be more challenging to displace clean firm generation in Northern latitudes if electricity demand patterns shift due to electrification of heat and transport.pic.twitter.com/YNu31g8wW5

      3 replies 0 retweets 20 likes
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    4. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      4. Energy capacity cost and discharge efficiency are the most important factors to make long-duration energy storage competitive. Charge and discharge power capacity costs and charge efficiency of secondary importance.pic.twitter.com/za2ihS7VSE

      3 replies 0 retweets 10 likes
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    5. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      5. How long is long duration? The ability to sustain discharge for 100+ hours (4+ days) is required for LDES to deliver the largest electricity cost reductions & maximize substitutability for firm generation. The duration was less than 650 hours (27 days) for all cases consideredpic.twitter.com/hPhWgNUYex

      1 reply 1 retweet 18 likes
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    6. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      What did we do for this study? We explored five generic design parameters that collectively can describe pretty much any possible long-duration storage technology, from pumped hydro and flow batteries to thermal storage and electrolytic hydrogen.pic.twitter.com/zmq2FL3mP7

      2 replies 1 retweet 11 likes
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    7. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      The five parameters, which define the technology "design space" for possible long-duration energy storage technologies are: 1) energy storage capacity cost 2) charge power capacity cost 3) discharge power capacity cost 4) charge efficiency; and 5) discharge efficiency

      2 replies 0 retweets 13 likes
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    8. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      A specific combination of values for these five parameters forms a technology ‘case’ that is available for deployment in a detailed capacity expansion model (GenX) that combines investment + production cost optimization with hourly operational constraints and full year resolution

      1 reply 0 retweets 6 likes
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    9. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      We explore 1,280 distinct technology cases spanning a wide range of possible design parameters – the “technology design space” – and compare the system outcomes for these cases to the case with no LDES (think of control versus treatment effect).

      1 reply 0 retweets 9 likes
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    10. JesseJenkins‏ @JesseJenkins 29 Mar 2021

      We also model 14 different power system scenarios (think of 14 control groups) describing different geographies, electricity demand patterns, availabilities of variable renewable resources, and costs for a total of around 18,000 total cases. (Burned a lot of CPU time for this!)

      3 replies 0 retweets 12 likes
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       🤷🏻‍♀️‏ @DanielleFong 29 Mar 2021
      Replying to @JesseJenkins

      great work! just in time to cite for my arpa-e open app 😅

      1:12 PM - 29 Mar 2021
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      • JesseJenkins
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