Enphase Energy makes up 8.3% of the fund, and Tesla (NASDAQ: TSLA) makes up 8%. However, favorable U.S. government policy, most notably the tax credits and funding available from the Inflation Reduction Act (IRA), is a catalyst that could spark a renewed interest in clean energy. An investment in decarbonization The First Trust Nasdaq Clean Edge Green Energy Index Fund is big in its own right, with $1.7 billion in net assets.