The Invesco WilderHill Clean Energy ETF (PBW) fell about 11% on June 5, 2026, driven by a sharp rise in two-year Treasury yields to a 16-month high, rather than company-specific issues. This surge in yields increased discount rates on future cash flows, disproportionately affecting long-duration clean energy stocks with negative or low free cash flow and high leverage. Key holdings like Enphase Energy and First Solar saw significant declines despite mixed fundamentals. The ETF’s year-to-date gains depend on Treasury yields stabilizing and continued political support for clean energy tax credits; any shifts could lead to further repricing.