Alexandra Rasch Castillo

Founder and CEO Caban

Last Reviewed: September 24, 2026

Executive Summary

Alexandra Rasch Castillo is the founder and CEO of Caban, the company she started in 2018 with engineer Brian Pevear as Caban Systems. It now operates as Caban Energy. Caban set out to decarbonize one of the most diesel-dependent corners of infrastructure: the backup power at mobile phone towers. It combines its own lithium-ion storage systems, remote-monitoring software and an Energy-as-a-Service model in which customers pay for resilient power instead of buying equipment. The Guatemalan-born engineer first deployed the systems in Latin America and has since expanded across critical infrastructure. Caban reports more than 1,100 projects and customers including T-Mobile, Claro and Liberty Latin America. She was named to the Forbes 30 Under 30 Energy list in 2020.

Career Highlights

• Co-founded Caban Systems in 2018 with Brian Pevear, and leads it as CEO; a March 2025 SEC Form D lists her as an executive officer and director.
• Closed $43 million of a targeted $51 million Series B in January 2023, led by BCP Ventures with the Ontario Power Generation Pension Fund, Ember Infrastructure, Portfolia and Inspiration Ventures.
• Named to the Forbes 30 Under 30 Energy list in 2020.
• Named an Entrepreneurial Icon on ALPFA’s Most Powerful Latinas list in 2021 and 2022.
• Under her leadership Caban ranked second in Energy Storage and Distribution among Time’s America’s Top GreenTech Companies of 2024.

Professional Journey

Rasch Castillo, a native of Guatemala, studied at Rice University and earned a master’s degree at the University of California, Berkeley. She founded Caban Systems in 2018 with Brian Pevear. The company describes them as two engineers who wanted to decarbonize the industries most dependent on fossil fuels. They began with telecom towers, which often rely on diesel generators where grid power is unreliable. Caban built its first lithium-ion batteries in 2018, drew on her Guatemalan background to deploy them first across Latin America, and opened a manufacturing site in Burlingame, California.

The business model grew into Energy-as-a-Service, which pairs the company’s storage hardware with remote-monitoring software in a turnkey offering. By early 2023 the company said it was operating at more than 500 sites in seven countries, and in January of that year it closed $43 million of a planned $51 million Series B to expand globally and beyond telecoms. “Raising our Series B is a transformational moment for our company,” she said at the time. According to the company, she was named a Disruptor and Rising Star at the 2020 Global Women in Telco & Tech Awards and was invited to the World Economic Forum in Davos in 2023 to speak on climate technology.

In 2024 Time ranked Caban second in the Energy Storage and Distribution category of its America’s Top GreenTech Companies list. A new holding company, Caban Systems Holding, Inc., filed a Form D in March 2025 listing her as an executive officer and director alongside other officers and board members. In December 2025 Caban sold its battery-pack manufacturing equipment and software to KULR Technology Group, which took over the Plano, Texas production line and signed a five-year preferred agreement to supply batteries to Caban. Caban now describes itself as a provider of energy and storage systems for critical infrastructure. It offers Energy-, Battery- and Infrastructure-as-a-Service, operations and maintenance, and a cloud platform called Continuo, and it reports more than 1,100 projects deployed worldwide.

Education

Rice University

Bachelor’s degree

University of California, Berkeley

Master’s degree