A watercolor valley: a cartographer’s hillside workshop, a river and a mountain observatory.

The workshop of

Thibald Astier

Spatial intelligence, energy & the architecture of compute.

The ship and star of Eärendil
Enter the cabinet

Each object opens a chapter of the cabinet.

The Atlas of Territories

Where to build. How to connect.

A painted atlas and cartographic instruments

The paths of energy

US Grid GIS brings power lines, substations, published projects and large-load procedures together on one map. Inspect a source, follow a milestone, export the evidence.

An open-source map with API, CSV and GeoJSON exports. Available power and connection dates require confirmation from the utility.

US Grid GIS · the map and its sourcesScreenshot of the US Grid GIS map

Explore the evidence, from a network line to its public source.

A painted observatory under the stars, above the mountains

The orbital observatory

What happens when a data center leaves Earth? Solar energy, heat rejection, interconnects, mass and economics set the rules.

A series of independent studies, from a falsifiable project thesis to the physical shape of a platform, engineering drawings and an interactive CAD model.

Concept studies, with assumptions and revisions documented in the manuscripts.

The Library

The physical geography of compute, from the grid to orbit.

Original manuscripts, working hypotheses and technical syntheses.

A painted library, study table and a window overlooking the mountains

Original PDFs and documented assumptions. Agentic notes draw on sources published through 2024. These works are independent studies and technical syntheses.

In the margins, on Medium

The Megawatt-Month: The Hidden Currency of the AI Buildout

Why the date at which power becomes available changes the value of a site.

You Don’t Have an Ontology. You Have a Schema With Ambitions.

An essay on ontologies and data structures.

The Field Journal

Ideas put to the test of places and encounters.

A painted journal with drawings of an Alpine town and an auditorium

Zurich, 30 June 2026 · ERATOS also appears in the archive of the 154th SICTIC Investor Day.

Painted letters and a quill on a desk

The Correspondence

A demonstration, a site study, a conversation. Specific feedback on the work.

After the platform demonstration
“I think what you're building is a highly useful platform with enormous potential for expandability.”
Mark ThieleBoard member, IDCACo-founder & former CEO, EdgevanaProfessional background ↗
After an initial review of a site study
“We are very impressed with the quality of the site analysis and clarity of the presentation.”
Rob GarrattHead of DevelopmentClearstone EnergyProfessional background ↗
On discovering ERATOS · translated from French
“We were really excited to discover Eratos.”
Elisabet AlvarezArchitect & founderSuisse ArchitecteProfessional background ↗

Advice & conversations

I draw on conversations with experienced founders and business leaders, in a personal capacity.

Freddy Mallet

Co-founder of Sonar

Entrepreneur & investor

Entrepreneurial adviceBackground ↗

Reading at the Cabinet

Go back to the sources.

An ink and watercolor portrait of Thibald Astier

Between Earth and the stars

I build territorial intelligence tools and study the physical architecture of AI infrastructure: where to build, how to power it, and how to connect it.

Thibald Astier, co-founder of Earendil · ERATOS