Major companies such as Amazon and Google on Wednesday signed a pledge to support the goal of at least tripling the world's nuclear energy capacity by 2050, on the sidelines of the CERAWeek conference in Houston.

The pledge is nonbinding, but highlights the growing support for expanding nuclear power among leading industries, finance and governments.

A coalition of the world's biggest companies and largest energy users signed a pledge Wednesday in Houston to support a tripling of nuclear energy capacity by 2050.