Three Months Ended

Mar. 31,

2013

June 30,

2013

Sept. 30,

2013

Dec. 31,

2013

Mar. 31,

2014

June 30,

2014

Sept. 30,

2014

Dec. 31,

2014

(Dollars in thousands, except per share amounts)

Revenues:

Electricity

$

68,298

$

87,713

$

88,994

$

84,742

$

94,817

$

91,692

$

102,506

$

93,286

Product

50,608

64,966

41,755

46,163

47,619

35,911

37,736

55,957

Total revenues

118,906

152,679

130,749

130,905

142,436

127,603

140,242

149,243

Cost of revenues:

Electricity

55,088

58,641

61,356

57,789

57,034

67,322

61,727

60,547

Product

37,041

43,657

29,637

30,212

31,943

20,324

23,040

33,836

Total cost of revenues

92,129

102,298

90,993

88,001

88,977

87,646

84,767

94,383

Gross margin

26,777

50,381

39,756

42,904

53,459

39,957

55,475

54,860

Operating expenses:

Research and development expenses

1,000

1,608

838

1,519

(87

)

232

250

388

Selling and marketing expenses

11,509

3,777

2,575

6,752

3,379

3,216

4,258

4,572

General and administrative expenses

6,584

7,134

6,546

8,924

7,596

6,072

7,179

7,767

Write-off of unsuccessful exploration activities

--

4,094

--

8,107

--

7,332

Operating income

7,684

37,862

29,797

21,615

42,571

22,330

43,788

34,801

Other income (expense):

Interest income

41

87

742

462

111

90

35

76

Interest expense, net

(15,863

)

(17,504

)

(18,459

)

(21,950

)

(20,518

)

(22,072

)

(22,494

)

(19,570

)

Foreign currency translation and transaction gains (losses)

1,682

904

1,258

1,241

(638

)

(55

)

(2,946

)

(2,200

)

Income attributable to sale of tax benefits

3,532

5,783

5,027

5,603

6,717

6,130

5,487

5,809

Gain from sale of property, plant and equipment

--

7,628

--

Other non-operating income (expense), net

1,417

29

137

9

63

343

243

107

Income (loss) from continuing operations, before income taxes and equity in income of investees

(1,507

)

27,161

18,502

6,980

28,306

14,394

24,113

19,023

Income tax benefit (provision)

(4,047

)

(5,780

)

(5,201

)

1,476

(6,320

)

(4,967

)

(6,444

)

(9,877

)

Equity in income (losses) of investees

--

9

(158

)

(101

)

(197

)

(114

)

(899

)

(2,003

)

Income (loss) from continuing operations

(5,554

)

21,390

13,143

8,355

21,789

9,313

16,770

7,143

Discontinued operations:

Income from discontinued operations (including gain on disposal of $0, $3,646, $0, $0, $0, $0, $0, and $0, respectively)

831

4,480

--

Income tax provision

(251

)

(363

)

--

Total income from discontinued operations

580

4,117

--

Net income (loss)

(4,974

)

25,507

13,143

8,355

21,789

9,313

16,770

7,143

Net loss (income) attributable to noncontrolling interest

(85

)

(322

)

(193

)

(193

)

(237

)

(177

)

(256

)

(163

)

Net income (loss) attributable to the Company's stockholders

$

(5,059

)

$

25,185

$

12,950

$

8,162

$

21,552

$

9,136

$

16,514

$

6,980

Earnings (loss) per share attributable to the Company's stockholders

Basic:

Income (loss) from continuing operations

$

(0.12

)

$

0.46

$

0.29

$

0.18

$

0.47

$

0.20

$

0.37

$

0.15

Discontinued operations

0.01

0.09

--

-

Net income (loss)

$

(0.11

)

$

0.55

$

0.29

$

0.18

$

0.47

$

0.20

$

0.37

$

0.15

Diluted:

Income (loss) from continuing operations

$

(0.12

)

$

0.46

$

0.28

$

0.18

$

0.47

$

0.20

$

0.36

$

0.15

Discontinued operations

0.01

0.09

--

-

Net income (loss)

$

(0.11

)

$

0.55

$

0.28

$

0.19

$

0.47

$

0.20

$

0.36

$

0.15

Weighted average number of shares used in computation of earnings (loss) per share attributable to the Company's stockholders:

Basic

45,431

45,438

45,461

45,479

45,606

45,690

45,537

Diluted

45,431

45,448

45,494

45,610

45,660

45,963

46,102

46,018