STUTTGART, Germany—Assemblers at Bosch’s Feuerbach factory have begun producing fuel cell modules for Nikola Corp.’s much-anticipated Class 8 truck.

Fuel cells offer tremendous potential as a clean power source. The chemical energy of hydrogen and oxygen reacts with fuel cells and converts the energy to electricity. The decades-old technology is ideal for a wide variety of applications, including stationary power stations and many forms of transportation.

DETROIT—General Motors plans to supply Hydrotec fuel cell power cubes to Navistar for use in its International RH Series of heavy-duty trucks.

ERLANGEN, Germany—A new generation of DC-DC converters achieve very high efficiency despite their extremely compact footprint.

LONG BEACH, CA—Toyota and Hino are working on a joint project to develop a Class 8 fuel cell electric truck.

TOKYO—Honda Motor Co. and General Motors Co. plan to set up a joint assembly plant to manufacture fuel cells. The goal is to reduce the market price of fuel-cell vehicles to levels that can compete with gas-electric hybrid vehicles.

AICHI, Japan—Toyota has unveiled a new assembly line here for its Mirai sedan, which is powered by hydrogen fuel cells. The line is expected to produce 700 units this year, expanding to 2,000 units in 2016 and 3,000 units in 2017.