# SuStream Tech

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/sustream-tech

- Industry: Renewable Energy
- Headquarters: Suzhou, China
- Website: sustreamtech.com
- Latest round: Angel (Sep 11, 2026)
- Investors on record: 1

## About

Based in Jiangsu, China and founded in 2025, SuStream Energy Technology Co., Ltd., trading as SuStream Tech, provides distributed underwater power generation and marine energy solutions for the renewable energy and marine technology industries. The company was founded by its CEO, Guiyu Cao. Its founding team primarily comes from the University of Oxford, with academic backgrounds from institutions such as the Hong Kong University of Science and Technology, Tsinghua University, the University of Warwick, Beihang University, and Northwestern Polytechnical University. In September 2026, it raised tens of millions of CNY in Angel funding from Casstar Capital. 

SuStream Tech’s proprietary core products include the Ti6 series of dam-free hydro-generators, which features rated power outputs ranging from 10W to 200W—which provide stable, continuous online power for various water-based monitoring instruments; and the Ti600 series of hydro-turbine array systems, which has installed capacities ranging from 10kW to 600kW, supporting large-scale underwater microgrid operations and are suitable for diverse applications in rivers and oceans.

The company’s revenue is generated from the sales of turbine generators, underwater microgrids, and integrated marine energy systems.

The company will use the Angel funding to support the R&D of distributed, dam-free underwater microgrid technology, core product iteration, expansion of the technical team, and industrialization demonstration projects, thereby advancing its transition from equipment R&D and system validation to engineering application.

## Funding rounds

- Angel, Sep 11, 2026 — Casstar Capital

## Investors

- Casstar Capital (https://capitalatlas.ai/funds/casstar-capital) — Angel