Ars makes every effort to cover its own travel costs. To attend Nikola's conference, we covered the flight out to Scottsdale, Arizona, but Nikola covered one night in a nearby hotel.SCOTTSDALE, Arizona—The Nikola Motor Company wants to reinvent trucking by replacing diesel heavy-duty trucks with hydrogen fuel cell trucks. But hydrogen skeptics are numerous, and not without good reason. Although hydrogen fuel cell vehicles are quiet, emissions-free (with the exception of water) during operation, and relatively fast-charging compared to battery electric vehicles, they have a host of other...…Ars makes every effort to cover its own travel costs. To attend Nikola's conference, we covered the flight out to Scottsdale, Arizona, but Nikola covered one night in a nearby hotel.SCOTTSDALE, Arizona—The Nikola Motor Company wants to reinvent trucking by replacing diesel heavy-duty trucks with hydrogen fuel cell trucks. But hydrogen skeptics are numerous, and not without good reason. Although hydrogen fuel cell vehicles are quiet, emissions-free (with the exception of water) during operation, and relatively fast-charging compared to battery electric vehicles, they have a host of other...WW…

On Thursday, the Tennessee Valley Authority (TVA), a federally owned utility that operates in Tennessee and Kentucky, voted 5 to 2 to close two coal-fired power-generating units by 2023, .The decision includes closing the last coal-fired unit at the Paradise Fossil Plant by 2020, as well as closing the coal-fired Bull Run Steam Plant by 2023. On Thursday morning, the : "The TVA Board votes to retire Paradise Unit 3 and Bull Run within the next few years. Their decision was made after extensive reviews and public comments and will ensure continued reliable power at the lowest cost feasible....…On Thursday, the Tennessee Valley Authority (TVA), a federally owned utility that operates in Tennessee and Kentucky, voted 5 to 2 to close two coal-fired power-generating units by 2023, .The decision includes closing the last coal-fired unit at the Paradise Fossil Plant by 2020, as well as closing the coal-fired Bull Run Steam Plant by 2023. On Thursday morning, the : "The TVA Board votes to retire Paradise Unit 3 and Bull Run within the next few years. Their decision was made after extensive reviews and public comments and will ensure continued reliable power at the lowest cost feasible....WW…