The total number of major brands that have pledged to use 100 per cent renewable electricity has risen to 36, with US giants Nike and Walmart now on board.
A host of new companies made the "RE100" commitment, organised by Climate Group, at the non-profit's Climate Week event in New York ahead of crucial UN talks which aim to secure a new global deal on tackling climate change in Paris in December.
Procter & Gamble, Starbucks, Goldman Sachs, Johnson & Johnson, Salesforce, furniture company Steelcase and financial firm Voya Financial all made the pledge to get their electricity solely from green sources, joining firms like Marks & Spencer, BT Group, Nestle and Ikea who already committed.
Mark Kenber, chief executive of the Climate Group, said: "Research shows that the most ambitious companies have seen a 27 per cent return on their low carbon investments - no wonder new names keep joining RE100.
"Lowering risk, protecting against price rises, saving millions and boosting brand is what shaping a low carbon economy is all about. Today these companies are signalling loud and clear to negotiators that forward-thinking businesses back renewables and want to see a strong climate deal in Paris."
Steelcase already became 100 per cent powered by renewables last year, while some of the other firms have set target years, including Goldman Sachs which is aiming for 2020 and Nike which has set 2025 as its target.