Inventor Kaustubh Chilwarwar advances electricity-free desalination from Florida to global stage, secures $44.6M valuation
PLANTATION, Fla. – One week after being officially recognized as a Qualified Team in the $119 million XPRIZE Water Scarcity competition (Track B – Novel Materials and Methods), ChilCorp-Water, the Florida-based climate-tech startup founded by inventor Kaustubh Chilwarwar, is reporting strong traction. The company has been independently valued at $44.6 million USD (pre-revenue, pre-prototype) by global startup valuation platform Equidam, reflecting the strength of its patent portfolio, disruptive technical differentiation, and massive market potential.
The recognition, announced on September 22 following a rigorous international evaluation, placed ChilCorp-Water among 143 top-ranked innovators worldwide advancing to the next phase: Qualified Teams Testing.
Since then, the company has seen surging investor interest and new opportunities to accelerate development. At the center of this momentum is its breakthrough technology, Water Cubes: a solid-state, electricity-free desalination system that passively extracts freshwater from seawater without membranes, pumps, or external energy. What began in Kaustubh’s living room, built on intuition, self-filed patents, and improvised lab experiments, has grown into a top-ranked global contender redefining the future of desalination.
“Being named a Qualified Team was an honor,” said Kaustubh Chilwarwar, Founder of ChilCorp-Water. “But what excites me most is the traction we’ve seen since: investors, collaborators, and communities are signaling how urgently this technology is needed. Water Cubes represent a new frontier in decentralized desalination: scalable, silent, and self-powered.“
Globally, over 2 billion people lack access to safe drinking water, according to the WHO/UNICEF Joint Monitoring Programme. Regions most affected include Sub-Saharan Africa, South Asia, and Latin America, where communities often rely on expensive or unreliable water sources. While the long-term vision is to serve these water-scarce regions, ChilCorp-Water plans initial field tests in America and Europe, where climate-related water stress is also rising.
Unlike traditional reverse osmosis, Water Cubes are wafer-based, modular, and designed for scalability from off-grid communities to industrial desalination plants. The technology leverages hydrophilic surfaces and ambient infrared radiation to separate salt from seawater, creating a silent, low-maintenance alternative to energy-intensive systems.
ChilCorp’s early development took place at the Washington Nanofabrication Facility (University of Washington) and the Idaho Microfabrication Laboratory (Boise State University). Today, the company is preparing for Qualified Teams Testing, the next stage of the competition, while also laying groundwork for pilot demonstrations in America and Europe.
The project is supported by a multidisciplinary team, which includes Stefan Grigorov, founder of FounderCentre in Sofia, Bulgaria, who contributes to strategic development and investor support; along with Arvind Kumar, Trupti Puttewar, and Suman Sah, who helped establish ChilCorp International Pvt. Ltd. in India to support future deployments.
XPRIZE Water Scarcity is a multi-year global competition sponsored by the Mohamed bin Zayed Water Initiative, aimed at catalyzing affordable, energy-efficient desalination solutions for global impact. Qualified Teams represent the most promising approaches to revolutionizing seawater access for the future.
For more information, visit: www.chilcorp-water.com
To learn more about the competition: xprize.org/water
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