Sierra Peterson
736 posts

Sierra Peterson
@sierrap
Energy + climate tech investor, founder @VoyagerVC. Past lives: Clean Power Finance, @ObamaWhiteHouse, @IEA. Last seen running the Presidio trails.


We have two exciting announcements today as Cantos turns 10… First, we closed our new fund earlier this year. Canto IV is a $70M fund purpose-built to lead pre-seed and seed rounds. We oversubscribed, wanting to keep it right-sized for being a founder's most aligned first partner. Second, we launched our new look with help from our friends at @asimov_co! Cantos is so-named as an ode to epic poems, where grand stories are written in "cantos" rather than chapters. We view founders as the protagonists of today's epics and seek to back those whose deeds become the stuff of legend. Our new website is a testament to the scale of their ambitions, with visions from a future they will have shaped. Resonat in Æternum 🖋️

Manufacturing alloys now run 900-day lead times. That's because we're still making metal by melting it, which humans have done since the Bronze Age. Engineering alloys are inside everything advanced: jet engines, rockets, energy infrastructure, precision tools. The traditional melt-based process is energy-hungry, slow, and pressed against a performance ceiling it can't push through. Aircraft sit on the ground, manufacturing lines slow down, and supply gaps show up across aerospace, energy, and materials production. @FoundationAlloy skips melting entirely. MetalsFIRST is a solid-state process that produces engineering alloys legacy methods can't make: specialty steels with 80-90% fewer processing steps, and alloys at 3x the strength of standard commercial alternatives. A new 36,000 sqft Massachusetts facility and a modular production cell in New Hampshire put the company on a path from pilot output to tons per week by 2027 -- all made in America. We're excited to lead @FoundationAlloy's $22M Series A and back Jake Guglin's all-star 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.

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.




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.

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 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!


Powering the future with next-generation geothermal technology. Take a look back on @Fervoenergy's milestone celebration at Nasdaq. #NasdaqListed $FRVO





