Top 10: Biggest Renewable Energy Companies Canadian Solar Inc. Market cap: $2.74bn. ... Daqo New Energy Corp. Market cap: $3.92bn. ... Brookfield Renewable Corp. Market cap: $5.16bn. ... Algonquin Power & Utilities Corp. Market cap: $5.2bn. ... Plug Power Inc. ... Siemens Gamesa Renewable Energy SA. ... Vestas Wind Systems A/S (VWDRY) ... Orsted A/S. More items... Mar 9, 2023