FuelCell Energy Inc (FCEL) shares are having a rough Monday, dropping roughly 20% in early trading and wiping out a chunk of their recent monster gains. The Nasdaq is down 0.81% and the S&P 500 has shed 0.41%, but FCEL's slide is more about its own red-hot run cooling off than the broader market.

Retail Traders Pivot To Profit-Taking

The main culprit? Aggressive profit-taking. FCEL hit a 52-week high of $22.83 just recently, capping a multi-day surge that saw the stock more than double in the last month alone. After that kind of move, it's not surprising that retail traders are locking in gains. When a stock climbs over 100% in a month, some selling is almost inevitable.

AI Data Center Euphoria Cools

The clean energy sector's momentum is taking a breather today. The recent excitement was fueled by a landmark power deal last month, when Bloom Energy Corp (BE) signed a master agreement with Oracle Corp (ORCL) supporting up to 2.8 gigawatts of capacity. That deal sent the whole hydrogen and fuel cell space soaring on hopes that AI data centers would drive massive demand for clean power. But this week, that enthusiasm is cooling off, and FCEL is feeling the chill.

FCEL Technical Levels To Watch During Pullback

Despite today's drop, FCEL's longer-term uptrend is still intact. The stock is trading 25.5% above its 20-day simple moving average (SMA) of $13.76 and more than double its distance above the 200-day SMA of $7.93. That's a sign of strength, but momentum is the bigger story here. The relative strength index (RSI) is at 81.43, which is firmly in overbought territory. That means the move has been stretched and pullbacks are likely, even if the primary trend remains bullish.

From a structural perspective, the backdrop is still constructive. The 20-day SMA is above the 50-day SMA, and the golden cross that formed in October 2025 continues to frame the longer-term trend positively. So while today's sell-off is sharp, it looks more like a healthy correction than a trend reversal.

FCEL Price Action: FuelCell Energy shares were down 20.88% at $16.89 at the time of publication on Monday. Over the past month, the stock has gained about 100.92% versus a 3.9% rise in the S&P 500, and it's up roughly 137% year-to-date compared to the index's 7.4% gain.