# Arnold Leitner

> Arnold Leitner is an Austrian-born, German-raised physicist and clean-energy founder who turned a teenage passive-house project into a career rethinking how power is generated and delivered. After writing the U.S. Department of Energy study Fuel From the Sky, founding the concentrating-solar company SkyFuel, and seeing photovoltaics overtake that market, he founded YouSolar - now Leitnium - to build modular nanogrids that combine solar generation, batteries, controls, and high-power delivery for homes and businesses.

- **Role:** Founder and CEO at Leitnium (formerly YouSolar)
- **Organizations:** Leitnium, YouSolar, SkyFuel, RDI Consulting/Platts, U.S. Department of Energy, National Renewable Energy Laboratory
- **From:** Vienna, Austria
- **Nationality:** Austrian-born American
- **Education:** Ph.D. in physics (superconductor physics), University of Colorado Boulder, MBA, Columbia Business School
- **Known for:** Designed one of Germany's early ultra-low-energy passive houses as a teenager; his family built it in 1991., Authored the 2002 U.S. Department of Energy/NREL study Fuel From the Sky on western solar-power potential., Received an extraordinary-ability U.S. green card tied to his energy work and later became a U.S. citizen.

## Career timeline

- **1991** — His family built the ultra-low-energy passive house he had designed as a teenager in Germany.
- **2002** — Authored Fuel From the Sky: Solar Power's Potential for Western Energy Supply while a senior consultant at RDI Consulting, a Platts unit.
- **2005-2006** — Founded SkyFuel while attending Columbia Business School and won Columbia's business-plan competition.
- **2010** — SkyFuel's SkyTrough concentrating-solar collector received an R&D 100 Award.
- **2012** — A solar charger bought for his family's earthquake kit prompted the analysis that led to YouSolar.
- **2013** — Founded YouSolar to develop modular solar-and-battery power systems.
- **2015** — SkyFuel exited through a sale, according to Leitner's official founder profile.
- **2016** — YouSolar completed an alpha system after approximately $2 million of development, according to Leitner.
- **2018** — Presented YouSolar's stand-alone solar-and-battery system at the Commonwealth Club.
- **2023** — Presented his 'last three miles' framework for distributed solar at RE+ and appeared on multiple climate and sustainability podcasts.
- **2024** — YouSolar began installing its third-generation PowerBloc and reported more than 3,000 shareholders and over $12 million invested across its fundraising history.
- **2026** — Continued as founder and CEO after YouSolar rebranded as Leitnium; the company was selected to present at the FiRe Annual Conference.

## Achievements

- Designed one of Germany's early ultra-low-energy passive houses as a teenager; his family built it in 1991.
- Authored the 2002 U.S. Department of Energy/NREL study Fuel From the Sky on western solar-power potential.
- Received an extraordinary-ability U.S. green card tied to his energy work and later became a U.S. citizen.
- Founded SkyFuel and helped commercialize a parabolic-trough collector using reflective film licensed from NREL.
- SkyFuel's SkyTrough technology received an R&D 100 Award.
- Founded YouSolar, now Leitnium, and led development of the modular PowerBloc nanogrid.
- Leitnium/YouSolar was included in TIME and Statista's America's Top GreenTech Companies 2024, as cited by the company and Keiretsu Forum Northwest & Rockies.

## Latest updates

- **2026-05** — Leitnium was featured by Keiretsu Forum Northwest & Rockies after selection among 12 companies to present at the FiRe Annual Conference; Leitner discussed the company's push toward customer-controlled primary power.
- **2024-12** — YouSolar announced installation of its first third-generation PowerBloc after earlier first- and second-generation deployments.
- **2024-12** — YouSolar reported that more than 3,000 shareholders had invested over $12 million across its fundraising history.
- **2024-09** — Leitner wrote about his daily Capitol Corridor commute and advocated electrified or hydrogen-powered rail paired with local autonomous transport.

## Links

- Website: https://www.leitnium.com/
- LinkedIn: https://www.linkedin.com/in/arnoldleitner

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Profile page: https://yespress.io/arnold-leitner
Published by YesPress — https://yespress.io
Last updated: 2026-08-17