Willett Kempton
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willett.bsky.social
Willett Kempton
@willett.bsky.social
I research, publish, mentor & advise on offshore wind power, electric vehicles #EV, and vehicle-to-grid power #V2G. Prof at U of Delaware. #energytransition #energysky 🔌💡 🔌🚗
Correction,
$4.31/Watt capital cost

For scale, a 2.6 GW OSW wind project, at 55% capacity factor, would run the entire state of Delaware—houses, industry, offices, everything. After the paperwork it’s a 3 year build. And reduces electric bills (a little) statewide.
November 6, 2025 at 8:29 PM
That solves for the big BTM devices. Sure, also good to have access to premises smart meter. But we didn’t need that access for home solar (done with RECs+NEM), and I think we won’t need it for #V2G nor BTM home batteries.
September 29, 2025 at 3:16 AM
Thanks, helpful link. We have successfully carved the turkey at different joints within 2222. Premises meter for kWh energy and TOD transactions at 1-h time resolution, settled with EDC via bill. Device meter for RTO A/S & capacity at 1-sec resolution, settled from RTO via aggregator. Running now.
September 29, 2025 at 3:11 AM
Hi @jigarshahdc.bsky.social Our UD #EV group is now running EVs in PJM A/S markets; entering PJM Capacity market seems blocked by their market requirement to also sell energy (impossible for batteries), not blocked by data release problems. Clarify, who should release what data?
September 28, 2025 at 8:58 PM
I’m Willett @ U Delaware, leading research, development, & policy on #offshorewind & #EV, latter including #V2G (using batteries in EVs to make the grid more reliable & renewables-efficient).

Practice sequence:
find-huge-gap➡️research➡️ prototype➡️standards&enabling-law➡️educate-companies➡️better-world
August 23, 2025 at 6:28 PM
I agree that output is a better measure of effect or value. My prior message answered your why: It’s business advantage in competitive markets, not some secret. Also, I gave you links to data on many projects. The information is out there but you don’t seem to want to do the work to find or read it.
August 8, 2025 at 10:48 PM
Power production is a highly competitive business. If you approach one project, right, their data is proprietary. Many reports summarizing data results, easy to find. Or, to analyze yourself, use pubic data, for example, click "download" on any of these: catalog.data.gov/dataset/util...
Department of Energy - Utility-Scale Solar, 2023 Edition: Analysis of Empirical Plant-level Data from U.S. Ground-mounted PV, PV+battery, and CSP Plants (exceeding 5 MWAC)
Berkeley Labs "Utility-Scale Solar", 2023 Edition presents analysis of empirical plant-level data from the U.S. fleet of ground-mounted photovoltaic (PV), PV+battery, and...
catalog.data.gov
August 6, 2025 at 8:07 PM
You asked for a number, I gave you it, told you I’ve calculated it and it’s in textbooks. You replied saying it is fabricated and showed you don’t understand it anyway. So a waste of my time to be helpful. Parting advice:if you build things based on ideology rather than engineering, they fall apart.
August 6, 2025 at 3:27 AM
U.S. mid-latitudes, installed capacity factors average 18% for solar, 30% for land-based wind, and 50% for offshore wind. That’s ± for equipment variants and local climatology. I’ve calculated these and reviewed with other analysts many times. They’re in intro textbooks. Don’t need to “find out”.
August 6, 2025 at 2:53 AM
This thread, and the cited IEA Report, are based on measurements, experience, and expert review. You responded with unsupported qualitative claims from political blogs, quantitatively wrong plus ridiculous given > $1 Trillion invested this year. Try posting in a political thread for more reactions.
August 4, 2025 at 3:14 AM