Calpine (NYSE: CPN) reported earnings on Feb. 13. Here are the numbers you need to know.

The 10-second takeaway
 For the quarter ended Dec. 31 (Q4), Calpine whiffed on revenues and missed expectations on earnings per share.

Compared to the prior-year quarter, revenue dropped and GAAP earnings per share grew.

Gross margins shrank, operating margins dropped, net margins expanded.

Revenue details
 Calpine chalked up revenue of $1.37 billion. The three analysts polled by S&P Capital IQ foresaw a top line of $3.03 billion on the same basis. GAAP reported sales were 6.3% lower than the prior-year quarter's $1.46 billion.

Source: S&P Capital IQ. Quarterly periods. Dollar amounts in millions. Non-GAAP figures may vary to maintain comparability with estimates.

EPS details
 EPS came in at -$0.19. The eight earnings estimates compiled by S&P Capital IQ predicted -$0.04 per share. GAAP EPS were $0.22 for Q4 compared to -$0.03 per share for the prior-year quarter.

Source: S&P Capital IQ. Quarterly periods. Non-GAAP figures may vary to maintain comparability with estimates.

Margin details
 For the quarter, gross margin was 19.5%, 680 basis points worse than the prior-year quarter. Operating margin was 4.8%, 780 basis points worse than the prior-year quarter. Net margin was 7.3%, 820 basis points better than the prior-year quarter.

Looking ahead
 Next quarter's average estimate for revenue is $1.15 billion. On the bottom line, the average EPS estimate is $0.01.

Next year's average estimate for revenue is $6.85 billion. The average EPS estimate is $0.70.

Investor sentiment
 The stock has a two-star rating (out of five) at Motley Fool CAPS, with 212 members out of 227 rating the stock outperform, and 15 members rating it underperform. Among 72 CAPS All-Star picks (recommendations by the highest-ranked CAPS members), 66 give Calpine a green thumbs-up, and six give it a red thumbs-down.

Of Wall Street recommendations tracked by S&P Capital IQ, the average opinion on Calpine is outperform, with an average price target of $21.54.

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