A pair of notable analyst upgrades hit the tape Wednesday, showing how quickly sentiment can shift on Wall Street. The bigger move came from TeraWulf, where an analyst dramatically increased his bullish outlook, while Plug Power finally caught a break with an upgrade to Buy.

Tim Moore at Clear Street upgraded Plug Power Inc. (PLUG) from Hold to Buy, though he simultaneously lowered his price target from $3.50 to $3. That's an interesting combination: more confident about the stock, but less optimistic about how high it can climb. Plug Power shares closed at $1.97 on Wednesday, meaning even the reduced target implies meaningful upside.

The more dramatic call came from Keefe, Bruyette & Woods analyst Bill Papanastasiou, who upgraded TeraWulf Inc. (WULF) from Market Perform to Outperform. But here's the kicker: he raised his price target from $9.50 all the way to $24. That's more than a doubling of his previous target and represents substantial upside from Tuesday's closing price of $11.49.

When an analyst not only upgrades the rating but also more than doubles the price target, that's a signal worth paying attention to. It suggests something fundamental has changed in the analyst's thesis about the company's prospects. TeraWulf operates in the Bitcoin mining space, a sector that's been experiencing renewed interest alongside cryptocurrency's recent momentum.

These rating changes highlight how analyst sentiment continues to evolve, particularly in the energy technology and crypto mining sectors where business models and market conditions can shift rapidly.