Has it really been a month since my last weekly solar roundup? I do apologize, Fools. Be assured that I have kept an eye on solar market happenings in the interim, and will continue to do so. Let's get right to it, shall we?

On Monday, Yingli Green Energy (NYSE: YGE) released earnings that didn't set off any sparks. Is the company still a top solar stock? You'll have to click through to read my take. Over in the Czech Republic, which this Fool called home for a semester in college, the prime minister called for a cut in the nation's German-style feed-in tariff. This follows reports that the local grid risks blackouts as a result of an overabundance of new solar and wind projects.

Tuesday saw Germany's Phoenix Solar report preliminary results. The company saw revenue explode 128% year-on-year in the fourth quarter, accounting for almost half of the full-year result. Check out the full-year EBIT (earnings before interest and tax) margins, though: 2% for the components and systems segment, and 3.5% for power plants. That's pretty brutal, and Phoenix is downright thriving compared to Q-Cells (more on that in a few paragraphs).

ReneSola (NYSE: SOL) gave us its financial rundown Wednesday. Shipments notched a record in the fourth quarter, while gross margins collapsed to 2.7%. We had fair warning that it would be a rough quarter, at least. The formerly wafer-focused company, which has since followed the popular path of vertical integration, gave pretty solid guidance for 2010. ReneSola expects gross margins to come in at 17% to 20% for the full year, a range that was pretty closely matched by LDK Solar (NYSE: LDK) the following day. ReneSola has incorporated into its guidance a wafer price decline of 10% to 15% in the back half of the year.

Yesterday, Q-Cells' CEO quit, citing a loss of confidence by the capital markets. That is a fair assessment. Bloomberg cites 32 sell recommendations out of 44 analysts following the German cell manufacturer, which used to be the world's largest.

To wrap up, here are a few of the biggest deals announced this week. SunEdison, a subsidiary of MEMC Electronic Materials (NYSE: WFR), is set to build Europe's largest PV solar power plant. First Solar (Nasdaq: FSLR) lined up a power purchase agreement for the remaining 300 MW of a huge plant it's developing in California. Finally, SunPower (Nasdaq: SPWRA) snagged a contract to supply Southern California Edison with 200MW of panels over the next five years.

First Solar is a Motley Fool Rule Breakers recommendation. Try any of our Foolish newsletters today, free for 30 days.

Fool contributor Toby Shute doesn't have a position in any company mentioned. Check out his CAPS profile or follow his articles using Twitter. The Motley Fool has a disclosure policy.