SunPower's (NASDAQ:SPWR) stock is on a tear again today, jumping 15% as I'm writing. Year to date, the stock is up 288% and the chart is almost a straight line higher since the middle of April.

SPWR Total Return Price data by YCharts

Today, the driver was SunPower's second quarter and 2013 guidance, announced at an analyst day meeting. As you can see below, most expectations are better than Wall Street was looking for, and the stock is up as a result.  


Q2 2013 Revenue

Q2 2013 EPS

2013 Revenue

2013 EPS

SunPower 5/15 Guidance 

$550 million to $600 million

$0.05 to $0.15

$2.5 billion to $2.6 billion

$0.60 to $0.80

Wall Street's Expectation

$513 million


$2.55 billion


Source: SunPower and Yahoo! Finance. Note: All figures are non-GAAP.

Let's not forget that SunPower's management has made a habit of sandbagging expectations; my target is still $1 per share in non-GAAP EPS this year. 

The presentation management gave laid out why SunPower is one of the top stocks in solar. Here are a few highlights.

  • Between 2012 and 2015 panel efficiency is expected to increase 10% to 23%. Over the same timeframe cost per watt is expected to decrease 35%.
  • SunPower expects to raise $3 billion in aggregate global capital to fund projects and leases.
  • Due to higher efficiency and lower degradation a SunPower rooftop system can produce 75% more energy than a comparable size from a commodity panel.
  • By 2015, the company expects to offer an energy management system and energy storage to go along with current installation services to distributed grid customers.
  • SunPower is the U.S. market share leader in both residential (22%) and commercial (11%) solar.

Leading the pack
SunPower and First Solar (NASDAQ:FSLR) have both issued better than expected guidance this year, which is driving both stocks higher. Falling costs and lucrative contracts for huge systems will drive this year's results for both companies but it's the lead that SunPower is building in distributed generation that I think will drive the stock over the long term.

In the distributed business, SunPower also appears to be outperforming SolarCity (NASDAQ:SCTY.DL), the installer who purchases third-party panels. SolarCity reported a loss greater than its revenue in the first quarter at the same time as SunPower's bottom line is improving. There are two reasons for this. First, SunPower's superior efficiency means it can pack more megawatts of power onto a roof. Second, it relies on its dealer network to market sales, which cuts down on operating expenses.

Today's guidance, and SunPower's continued improvement in both the distributed and utility spaces, will keep SunPower as my top stock in solar. The sky is the limit for this stock.