Performance and Cost

Table 1 summarizes the performance and cost indicators for the geothermal hot dry rock system being characterize d in this report. These indicators, although finalized in this report, have evolved over several Technolog y Characterization exercises, beginning at Sandia National Laboratory in 1993 [7].

Table 1. Performance and cost indicators.

Base Case

INDICATOR

1997

2000

2005

2010

2020

2030

NAME

UNITS

+/-%

+/-%

+/-%

+/-%

+/-%

Plant Size

MW

6

6.40

6.51

6.75

17.91

35.81

Injection Pump Parasitic

MW

1.20

1.20

1.20

1.20

3.12

6.24

Net Plant Size

MW

5.06

5.20

5.31

5.55

14.78

29.57

Performance

Geothermal Gradient

oC/km

65

65

65

65

65

65

Well Depth

km

4

4

4

4

4

4

Reservoir Volume

106 m3

99

99

99

99

198

396

Number of Well Triplets

1

1

1

1

2

4

Triplet Flow Rate

1000 kg/hr

223.6

+0/-20

223.6

+0/-20

223.6

+0/-20

223.6

+0/-20

290.7

+0/-38

290.7

+0/-38

Net Brine Effectiveness

Wh/kg

28

28.6

29.12

30.12

30.8

30.8

Capacity Factor

%

80

81

82

83

85

90

Annual Energy Production

103MWh

35.45

36.85

38.14

40.36

110.06

233.07

Capital Cost

Exploration

$/kW

395

10

385

10

377

+12/-10

360

+12/-8

135

+15/-6

68

+20/-6

Siting and Licensing

64

64

64

64

64

64

Land (@ $4,942/hectare)

5.93

5.78

5.65

5.40

2.71

1.69

Field Costs

Wells

2,076

+10/-10

1,878

+15/-8

1,631

+20/-5

1,384

+25/-0

945

+30/-0

639

+40/-0

Fracturing

611

+10/-5

595

+10/-5

553

+10/-5

501

+12/-3

406

+15/-0

391

+20/-0

Gathering System

99

91

81

71

58

55

Fresh Water System

172

161

146

132

110

85

Injection Pumps

140

137

134

128

115

115

Total Field Cost

3,098

2,861

2,545

2,216

1634

1,286

Plant Cost

1,847

5

1,751

+7/-5

1,656

+10/-5

1,558

+15/-5

1330

+20/-5

1,163

+30/-5

Project Cost

109

109

109

109

109

109

Total Capital Requirement

$/kW

5,519

+23/-6

5,176

+25/-6

4,756

+29/-5

4,312

+34/-4

3276

+47/-3

2,692

1. The columns for +/-% refer to the uncertainty associated with a given estimate.

2. Construction period is 2 years, with 35% of capital cost incurred in year 1 and 65% incurred in year 2.

3. Totals may be slightly off due to rounding.

4. Although, no commercial HDR systems have been built as of 1997, the base case cost (1996) is an estimate of what a commercial HDR system would have cost in 1996 based on commercial binary plants at hydrothermal sites and actual deep geothermal wells recently drilled in Nevada.

Table 1. Performance and cost indicators.(cont.)

Base Case

INDICATOR

1997

2000

2005

2010

2020

2030

NAME

UNITS

+/-%

+/-%

+/-%

+/-%

+/-%

+/-%

Plant Size

MW

6

6.40|

6.51|

6.75

17.91|

35.81|

Operation and Maintenance Cost

Power Plant O&M

$/kW/yr

50

45

37

33

30

30

Daily Field O&M

$/kW/yr

35

34

33

32

30

28

Well Repair

$/kW/yr

134

128

121

114

103

94

Total Operating Costs

$/kW/yr

219

207

191

179

163

152

1. The columns for +/-% refer to the uncertainty associated with a given estimate.

2. Totals may be slightly off due to rounding.

3. Although, no commercial HDR systems have been built as of 1997, the base case cost (1996) is an estimate of what a commercial HDR system would have cost in 1996 based on commercial binary plants at hydrothermal sites and actual deep geothermal wells recently drilled in Nevada.

Notes:

1. The columns for +/-% refer to the uncertainty associated with a given estimate.

2. Totals may be slightly off due to rounding.

3. Although, no commercial HDR systems have been built as of 1997, the base case cost (1996) is an estimate of what a commercial HDR system would have cost in 1996 based on commercial binary plants at hydrothermal sites and actual deep geothermal wells recently drilled in Nevada.

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