An exhibitor demonstrates a street vacuum cleaner during the first day of the Green Energy Expo & Romenvirotec event at Romexpo in Bucharest, Romania, March 3, 2026.

The event is a regional platform for technologies in green energy, water, waste and sustainable cities. (Photo by Cristian Cristel/Xinhua)

People visit the Green Energy Expo & Romenvirotec event at Romexpo in Bucharest, Romania, March 3, 2026.

The event is a regional platform for technologies in green energy, water, waste and sustainable cities. (Photo by Cristian Cristel/Xinhua)

An exhibitor demonstrates a virtual reality device next to a street vacuum cleaner during the first day of the Green Energy Expo & Romenvirotec event at Romexpo in Bucharest, Romania, March 3, 2026.

The event is a regional platform for technologies in green energy, water, waste and sustainable cities. (Photo by Cristian Cristel/Xinhua)

Exhibitors check a solar panel mounting system during the first day of the Green Energy Expo & Romenvirotec event at Romexpo in Bucharest, Romania, March 3, 2026.

The event is a regional platform for technologies in green energy, water, waste and sustainable cities. (Photo by Cristian Cristel/Xinhua)