@sierrapi
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Energy + climate tech investor, founder @VoyagerVC. Past lives: Clean Power Finance, @ObamaWhiteHouse, @IEA. Last seen running the Presidio trails.
San Francisco
Joined February 2011
- Tweets746
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Sierra Peterson retweeted
More thoughts on the state of US battery manufacturing coming soon.
For now: proud to highlight portfolio company Electroflow's coverage in the WSJ today. Turning lithium brine directly into structurally cheaper, fully US-made LFP, this is what reshoring the battery supply chain actually looks like.
@ChEMcShane @albertwenger @LarsenJensenUSA @Alexteng @usv @VoyagerVC @fiftyyears @HarpoonVentures
Big news for US energy + battery supply chains as @AnthroEnergy breaks ground on its full-scale factory in Kentucky. @DavidMackanic is moving fast!
techcrunch.com/2026/08/18/an…
Sierra Peterson retweeted
Great to see prescribed fire on federal land in the SF Bay Area. Now please do it where it will actually protect neighboring communities.
Sierra Peterson retweeted
Star Axis is complete. Fifty years in the making, land artist Charles Ross has finished his monumental observatory on a mesa in New Mexico. A staircase, aligned with Earth's axis, climbs to a open lens that tracks Polaris and the 26,000-year cycle of Earth's gravitational wobble.
Read the beautiful feature in the NYT: na2.hubs.ly/H06Q16C0
Sierra Peterson retweeted
Very Low Earth Orbit is on the BBC, and soon in the sky. We're proud investors in @NewOrbitSpace -- tune in.
Congratulations @bryantchou and the whole plot.ai team!
AI is making marketers lazy.
So we made the website do the work instead. Today, we're launching @ployai: the all-in-one marketing platform that turns your website into your hardest working employee.
And we're coming out of stealth today with a $27M seed led by @ycombinator and @firstround.
I spent 12 years at Webflow as the founding CTO where I built the product, but also started our marketing and sales teams that drove our fastest periods of growth. That experience made one thing obvious: the website is the center of your business. And it's only more important in the age of AI.
Foundation model apps can generate assets.
Point solutions can optimize pieces of the funnel.
But nothing runs the whole growth system: your site, brand, CMS, CRM, campaigns, analytics, SEO, AEO, and customer data all working together.
Until now.
Teams at @hex_tech and @clay_run, and growth agencies like Tonik and TNT Growth, are already powering sites on Ploy. Hex is generating on-brand ABM pages at scale, Clay is using its data to power a programmatic SEO engine, and TNT Growth is spinning up a landing page for each of their clients’ ads.
Wake up every morning with a report from Ploy - with what it did, and what it wants to do next.
Approve it. Ship it.
Or be lazy and just watch it cook.
Can't wait for this launch nell.ai/ ✨
Every generation inherits a new medium.
Ours is taking shape.
Introducing @_nellofficial.
Built in San Francisco. Backed by Danny Rimer and @IndexVentures, alongside @antonosika, @gokulr, @rauchg, Jason Citron, @joshm, @lennysan, @mati, @Max, @saradu, @soleio, @Thom_Wolf, and several others.
More soon.
Congratulations to the whole @SpaceX crew - your ambition and engineering excellence continue to inspire. Ad Astra! 💫
Let’s go @endurancegeo!
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.
Given the space-faring inspiration for our firm name at @VoyagerVC, I’m 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. 🛰️
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.
The perfect context for wide-open conversations
“You can see the surface of the Moon…we just went sci-fi.”
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.
Sierra Peterson retweeted
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 Fervo’s journey. fervoenergy.com/career/chief…
Hello, Moon. It’s great to be back.
Here’s 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-multimed…
Sierra Peterson retweeted
"A whole civilization will die tonight” are words no President of the United States had ever spoken until this morning. Donald Trump’s 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.
Watching snippets of this livestream was such a cool experience to share with my kid.
Great day for dreaming big. Ad astra per aspera! 💫
On the shoulders of giants... 🧑🏼🚀
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:
nitter.cf/i/broadcasts/1dGYljDRv…
Sierra Peterson retweeted
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.
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 it’s 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.
It’s hard to find a worse way to create fuel, with a wicked level of waste and downstream consequences.