More than 300 US companies led by Google, Facebook, GM and Walmart have launched an expanded Renewable Energy Buyers Alliance (Reba), with the aim of bringing more than 60GW of new clean-energy production online by 2025.

Originally founded in 2014 as a partnership between non-governmental organisations the Rocky Mountain Institute, World Wildlife Fund, World Resources Institute, and Business for Social Responsibility, Reba now represents a group of corporate renewable energy buyers with annual revenues of $1trn and 48TWh of electricity consumption, over 1% of the country’s yearly total.