Energy climate tech investor, founder @VoyagerVC. Past lives: Clean Power Finance, @ObamaWhiteHouse, @IEA. Last seen running the Presidio trails.
Joined February 2011
- Tweets 729
- Following 1,102
- Followers 4,130
- Likes 9,623
29 Photos and videos
Jun 13
Congratulations to the whole @SpaceX crew - your ambition and engineering excellence continue to inspire. Ad Astra! đŤ
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Jun 11
Letâs go @endurancegeo!
Jun 11
Endurance is proud to announce our $54M Series A, led by @foundersfund, to develop subsea geothermal energy. We're building mass-manufacturable and mass-deployable generators to access terawatts of low cost, clean, baseload power.
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Jun 9
Given the space-faring inspiration for our firm name at @VoyagerVC, Iâm particularly excited to have led the Series A for @NewOrbitSpace as they pioneer Very Low Earth Orbit. Top team building at planetary scale - and beyond. đ°ď¸
Jun 9
There's a sliver of space -- 200 to 300 km up -- that's been empty for sixty years. Not because nobody wanted it, but because nothing could survive there.
The closer a satellite flies to Earth, the more it can do and the less it costs. The catch is atmospheric drag: strong enough at this altitude to pull satellites back to Earth within weeks, and corrode them on the way down.
@NewOrbitSpace is building a satellite that handles both. NEO-1 has its own engine to fight the drag, materials that survive the chemistry, and a design built to stay up for five years. That unlocks high-resolution images from space at roughly 20x lower cost, 5G straight to a phone without rooftop antennas, and live HD video from orbit -- things that simply aren't possible from where satellites fly today.
We're proud to lead NewOrbit's $18.5M Series A and back the UK-based team.
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Jun 2
The perfect context for wide-open conversations
Jun 2
The Voyager team headed to Yosemite last month for our annual offsite. A few days in one of the most beautiful places in the world -- hiking, rafting, sunburning, and spending time together.
So much momentum right now in energy and reindustrialization - we're excited for the year ahead!
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âYou can see the surface of the MoonâŚwe just went sci-fi.â
On flight day seven, images from our @NASAArtemis II crew amazed, turning science fiction to reality. From the lunar far side to a solar eclipse from the Moon, the views are EVERYTHING. No pressure to pick a favorite.
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Sierra Peterson retweeted
Apr 8
New job posting, Chief of Staff, reporting directly to me.
Please help me share far and wide. This will be a fantastic role at a pivotal time in Fervoâs journey. fervoenergy.com/career/chiefâŚ
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Hello, Moon. Itâs great to be back.
Hereâs a taste of what the Artemis II astronauts photographed during their flight around the Moon. Check out more photos from the mission: nasa.gov/artemis-ii-multimedâŚ
ALT A crescent Earth setting behind the Moon\u2019s horizon. Credit: NASA
ALT Earth setting behind the Moon as seen by the Artemis II crew. Over half the left side of the image is filled by the gray lunar surface, pocked with craters. Credit: NASA
ALT A close view of the Moon. Jagged circles of craters dot the gray surface, fading to dark on the left side of the image. Credit: NASA
ALT A crescent Earth setting behind a hemisphere of the Moon. Credit: NASA
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Sierra Peterson retweeted
"A whole civilization will die tonightâ are words no President of the United States had ever spoken until this morning. Donald Trumpâs behavior is unhinged and making Americans less safe. After a 25-year career in the United States Navy, I have never met or served with anyone who so completely lacks the qualities of good leadership as Donald Trump does.
If the President takes the actions he has threatened to take, countless Iranian civilians will die, it will massively escalate this war, and the United States will be seen as a country without a moral or ethical compass. That will make Americans less safe right now and risk the lives of thousands of service members. The consequences will have a lasting and damaging effect on our nation.
Trump's mistakes have led us to this perilous moment, but the solution is not to escalate even further. This must stop.
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Apr 7
Watching snippets of this livestream was such a cool experience to share with my kid.
Great day for dreaming big. Ad astra per aspera! đŤ
On the shoulders of giants... đ§đźâđ
The Artemis II crew aboard Integrity have officially traveled farther into space than any humans before, passing the record set during Apollo. Our live coverage continues:
x.com/i/broadcasts/1dGYljDRvâŚ
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Sierra Peterson retweeted
Mar 30
The world's electricity infrastructure, mapped.
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Sierra Peterson retweeted
Mar 29
We could just... stop. This is such a waste of resources, land, and nitrogen. Even if we still wanted to use this land for fuel, we should be planting perennial grasses that require no fertilizer or irrigation and can yield far higher dry biomass per acre for use in Fischer-Tropsch (biomass to liquids) or gasification plants.
Mar 13
Effectively all growth in corn production over the last 20 years is for ethanol.
~20 million acres of conservation land, grassland, and soybean rotation was turned into corn monoculture that effectively strip mines the topsoil.
Meanwhile itâs the most fertilizer dependent crop with only a 40% uptake rate. So ~1.7 million tons of nitrogen runoff flows into the Mississippi basin annually while also polluting their own water supplies. This runoff ends up expanding the Gulf deadzone, which is also where 40% of domestic seafood comes from.
Itâs hard to find a worse way to create fuel, with a wicked level of waste and downstream consequences.
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Mar 26
Rocket tech đ for electricity - way to go Arbor!
Mar 25
Arbor Energy just landed a billion-dollar order to bring rocket turbine tech to the power grid techcrunch.com/2026/03/25/arâŚ
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Sierra Peterson retweeted
Mar 21
ProPublica spoke to dozens of people whoâve worked on U.S. immunization programs.
They shared a pit-of-the-stomach dread that future American children will fight for their lives against infections that have long been preventable.
propublica.org/article/rfk-jâŚ
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Sierra Peterson retweeted
Mar 20
Happy Solar Pessimism Chart Update Day to all who celebrate
Mar 20
NEW | The world installed a record 814 GW of solar and wind capacity in 2025 âď¸âĄď¸
That's over 1,000 TWh of electricity generation per year...
...enough to displace nearly twice Qatar's annual LNG export volume in gas generation đĽâ
Fossil fuels crisis? Wind and solar deliver.
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Sierra Peterson retweeted
Mar 17
Gotta be honest: not great that paying data centers to turn off is our plan for grid reliability through 2030. A curtailment payment? Come on. This is bad! We have to stop managing the failure and build the grid we should have built in the first place. What are we doing here?!
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Sierra Peterson retweeted
Mar 1
I just want to highlight that while fuel use is down in China due to rapid EV adoption, coal generation is *also DOWN.*
*Thatâs* how much solar theyâre building.
(everybody should do this)
đ¨đł Official data reports that 12% of China's vehicles are now EVs, with fuel sales plunging 5.7% in 2025
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Sierra Peterson retweeted
Feb 18
We should treat electricity as a growth platform (like highways, broadband) rather than a commodity to be tightly balanced at least cost. The federal agenda would then shift from âoptimize around forecast demandâ to âbuild abundant capacity and let growth come to it.â
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Sierra Peterson retweeted
Feb 16
Texas cruising on about 77% renewables this morning.
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