Land Water and Critical Materials Requirements

able 3. Resource requirements.

Indicator Name

Base Year 1997

Units

2000

2005

2010

2020

2030

Land

ha/MW

4.3

3.9

3.4

2.7

2.4

2.2

ha

0.07

10

29.3

46.1

82.3

152.1

Silicon

kg/MW

245

28

25

-

-

-

GaAs

kg/MW

-

-

-

18

16

15

Water

m3

0

0

0

0

0

0

The land requirement calculations shown in Table 3 assume the module area under plant size in Table 2 is 20% of land area, which corresponds to a 20% packing factor [14]. The module area is calculated using the AC rating under plant size, system efficiency, and the direct-normal insolation standard of 850 W/m 2. Silicon requirements are based on information in Reference 15, leading to 1.44 kg/m2 of silicon feedstock needed per wafer area or 3.29 kg/m2 of GaAs needed per wafer area. The difference between module area and cell-wafer area is, of course, the concentration tha t greatly reduces the amounts of expensive semiconductor material needed.

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