Dark Horizon: How Cheap Chinese Solar Tech Leaves Switzerland Exposed

Switzerland’s green transition is moving at an admirable speed, at least on paper. With 338,000 photovoltaic systems installed across rooftops, the nation prides itself on rapid energy progress. Yet behind the idyllic image of solar self-sufficiency lies a striking display of Swiss naivety.

A study by the National Test Institute for Cybersecurity reveals that tens of thousands of solar installations across the country are dangerously exposed to remote cyber manipulation. At the core of the issue is the inverter, the digital component that converts direct current into grid-ready alternating current. To facilitate maintenance, these devices are linked continuously to manufacturer servers via the internet. In Switzerland, roughly 100,000 systems rely on inverters produced in China, where two manufacturers, Huawei and Sungrow, control over 60 percent of the market.

The result is a severe cluster risk. If a state actor or extortionist cybercriminal were to force a simultaneous shutdown of these connected units, the national power grid could face immediate collapse. The threat is not theoretical. A Chinese manufacturer previously deactivated devices across several countries during a distribution dispute, leaving users with disabled units.

While foreign governments are stepping in, Swiss authorities appear surprisingly unbothered. The United States declared a national emergency for its high-voltage grid, banning grid-connected inverters from sanctioned nations and preparing to order the removal of foreign equipment. The European Union has drawn on its regulatory apparatus to block subsidies for projects using Chinese hardware, following warnings from European Commission officials regarding potential remote network manipulation.

Switzerland, by contrast, clings to a naive procurement process. When the Canton of Bern commissioned a solar installation for a vocational school, the tender effectively favored Huawei. Cantonal authorities acknowledged that cybersecurity is rarely embedded in public procurement, claiming that excluding a cheap Chinese vendor would constitute improper discrimination.

The Federal Intelligence Service has explicitly warned that if Switzerland lags behind in protecting critical infrastructure, it risks becoming an easy target. While the Federal Office of Energy and industry body Swissolar acknowledge the blackout risk, the country remains vulnerable. Whether Swiss pragmatism will eventually trump cheap hardware before the power grid goes dark is an open question.

Written by Thomas Nussbaumer thomas.nussbaumer@alpineweekly.com