Solar power stocks were coming under selling pressure on Monday, although a couple of names managed gains after Goldman Sachs upgrades. But SunPower tumbled after warning it was in danger of collapse.

SunPower Corp (SPWR  ) shares shed 35% to $4 after the company warned that there were substantial doubts about its ability to continue after it breached terms of a financial covenant agreement and added it would need to raise additional capital.

Goldman Sachs downgraded the stock in a sectoral coverage note to its clients. Lowering its rating to Sell and its price target to $4, the firm said: "We downgrade SPWR to Sell as the company works through a tough backdrop of uncertain supply chain, financing and operational challenges."

Goldman Sachs Upgrades Nova And Canadian Solar

Goldman Sachs still likes the sector, however, saying it expected a recovery in residential sales - particularly in the U.S. market. And after substantial losses in the sector this year, with the Invesco Solar ETF (TAN  ) down around 35%, valuations are still below market price.

"We see a median of 55% upside potential to our Solar Coverage," said analyst Brian Lee. "Our end market preference is still focused on utility-scale, while our geographical positioning also calls for more U.S. vs non-U.S. exposure."

He added: "We also see the early stages of a U.S. resi recovery forming in 2024 and see reasons to be more constructive on this end market, albeit still somewhat selectively, and highlight this as the most incremental shift in our stock picking framework since a year ago."

The broker raised Sunnova Energy International (NOVA  ) to a Buy with 65% potential upside to its $17 price target. Snares in NOVA, however, fell 3.1% to $13.41. Goldman also raised its rating on Canadian Solar (CSIQ  ), from Sell to Neutral and the shares rose 2% to $24.69.

Other Moves

  • Enphase Energy (ENPH  ) was up 0.6% to $124.63, after Goldman Sachs held its rating at Buy and suggested a potential 58% upside to its $158 price target. Lee says the company is "poised to benefit from a recovery in US resi solar fundamentals."
  • SolarEdge Technologies (SEDG  ) fell 3.4% to $93.86 after the broker cut its rating to Sell, saying "we believe a challenging backdrop in EU solar presents downside risk to consensus estimates in the near-to-medium term."
  • Sunrun (RUN  ) lost 3.8% to $17.94, despite Goldman retaining its Buy rating on the stock, while First Solar (FSLR  ) slid 1.7% to $165.75, after also maintaining a Buy rating.