Performance and Cost Summary 231 Cost

Table 2.4 summarizes the operating and cost parameters associated with the generating technologies discussed above. This indicative cost and performance data allow comparison among the generating technologies for mid-2007 Gulf-Coast construction costs.

Without CO2 capture, PC has the lowest COE; the COE for IGCC is 10-15% higher. However with CO2 capture, IGCC has the lowest COE. The cost of capture and compression for supercritical PC is about 4.80/kWe-h; that for IGCC is about one half that or about 2.40/kWe-h. The cost of transport and storage was estimated

Table 2.4 Performance and costs for coal-based power generating technologies [9-11]

Subcritical PC

Supercritical PC

PC- Oxy

IGCC

w/o capture

w/ capture

w/o capture

w/ capture

w/ capture

w/o capture

w/ capture

PERFORMANCE

Heat ratea, Btu/k\V-h

9,950

13,600

8,710

12,600

11,200

8,910

10,500

Generating efficiency (HHV)

34.3%

25.1%

39.2%

27.2%

30.6%

38.3%

32.5%

CO, emitted, kg/h

453,000

61,900

396,000

57,100

25,400

400,000

45,600

CO, captured at 90%, kg/hb

0

557,000

0

514,000

482,000

0

422,000

CO, emitted, g/kW-h

905

124

792

114

51

794

91

Life-cycle CO, emitted, g/kW-h

831

170

833

138

COSTS

Total plant cost, $/kW

1,564

3,085

1,625

2,961

2,450

1,977

2,644

Cap. Ch ar.,0/kW-h @ 14.4%c

3.24

6.38

3.36

6.13

5.07

3.90

5.10

Fuel, 0/kW-h @ $1.50/MMBtu

1.80

2.45

1.57

2.26

2.01

1.63

1.89

O&M, 0/kW-h

0.84

1.66

0.87

1.59

1.32

1.06

1.33

COE, c/kW -h

5.87

10.50

5.81

9.98

8.40

6.60

8.32

CO, Disposal Cost, 0/kW-h

0.00

0.72

0.00

0.67

0.63

0.00

0.57

COEd, t/kVV -h

5.87

11.22

5.81

10.65

9.03

6.60

8.89

Cost of CO, avoided vs. same technology w/o

$68

$71

$43

$37

captured, $/tonne captured, $/tonne

Basis: 500 MW plant net output. Illinois #6 coal (63.7%wt C. 27.1 MJ/kg (HHV). 85% cap Fac) aEfficiency = 3,414 Btu/kW-h/ (Heat rate)

b90% removal used for all capture cases, except PC-Oxy which was assumed 95%

'Annual capital charge rate of 14.4% from EPRI-TAG methodology, based on 55% debt @ 6.5%, 45% equity @ 11.5%, 38% tax rate, 2% inflation rate, 3 year construction period, 20 year book life, applied to total plant cost to calculate investment charge dIncludes the cost of CO, transport and geologic storage, details discussed in the text to be $6.5 per tonne of CO2; the cost of transport and storage will be discussed later. The cost of CO2eq-avoided for supercritical PC, including transport and geologic storage, is about $71 per tonne of CO2eq; that for IGCC is about $37 per tonne. That for Oxy-fuel is estimated at $43 per tonne of CO2eq. These numbers include the cost of CO2 capture and compression to a supercritical fluid, and CO2 transport and injection. Its lower COE would appear to make IGCC the technology of choice for CO2 management in power generation. However, Oxy-fuel has significant potential, and current research and demonstration activities will provide needed cost and engineering information. Further, for a lower rank coal and a higher plant elevation, the cost difference between IGCC and PC narrows. As such, significant reductions in the capture/recovery cost for PC could make it economically competitive with IGCC with capture in certain applications. In addition, the power industry still has concerns about IGCC operability and availability. Thus, we cannot declare any of these technologies superior to the others at this point.

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