Core Insights - Clean Energy Fuels Corp. (NASDAQ: CLNE) was previously part of the "green energy" excitement in early 2021, which significantly influenced the stock performance of small-cap clean fuel companies [1] Company Analysis - The company has experienced fluctuations in stock behavior, reflecting broader market trends in the clean energy sector [1] Industry Context - The clean energy sector has seen a surge in interest, particularly in small-cap companies, driven by the overall enthusiasm for green energy solutions [1]