Value chain · CLM-0852
In plain terms
Checking the study's own sums, its headline carbon-per-kilowatt-hour figures are averages across all sixty satellites over the whole programme's life, not the figure for one satellite, and the numbers add up correctly.
The claim as recorded
The functional unit underneath SRC-212's headline intensities is the whole 60-unit 300 GW fleet's lifetime output, not a single satellite: dividing Table 6's total GWP of 8.69E+12 kg CO2 eq (silicon) and 9.49E+12 kg CO2 eq (gallium arsenide) by the stated programme output of 77,388.9336 TWh reproduces 112.29 and 122.63 gCO2e/kWh against the paper's printed 112.27 and 122.63, agreeing to within the three-significant-figure rounding of Table 6 itself.
Evidence behind this: The arithmetic is the register's own (T0 in kind, working shown below), but every input is read from SRC-212, a T5 conference paper, so under the register's weakest-link rule the claim is graded T5. It establishes internal consistency of the source, not external truth.
Scope and limits
This verifies only that SRC-212 is internally consistent between its inventory total and its reported intensity. It does NOT verify the inventory itself, the emission factors, or any input datum, and it may not be cited as independent corroboration of the 112.27 or 122.63 figures. The 0.02 discrepancy on the silicon option is rounding in Table 6's three-significant-figure presentation, not an error in the source.
What it assumes
No assumptions are recorded against this claim.
Where it comes from
Working: 8.69E+12 kg is 8.69E+15 g; 77,388.9336 TWh is 7.7388934E+13 kWh; 8.69E+15 / 7.7388934E+13 = 112.29 gCO2e/kWh. For gallium arsenide, 9.49E+15 / 7.7388934E+13 = 122.63 gCO2e/kWh. Inputs: Table 6 p10 GWP row, and p4: "the system is capable of generating a total of 77,388.9336 TWh over its operational life span. This gives the system a capacity factor of 98.09%."
Related records
- Answers question
- QST-008 not published in this release
Cite this
energyaperture.com/c/clm-0852
CLM-0852, Energy Aperture, as of 2020.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-212
- CLM-0316In 2009 three researchers guessed that, once the energy to deliver and use it is counted, an oil-based fuel must return at least about 3...CLM-0810A 2020 modelling study estimated that, across its whole operating life from 2040 to 2100, the 1978 NASA/DOE space solar power design would...CLM-0811In a 2020 modelling study of the 1978 NASA/DOE space solar power design, the carbon per kilowatt-hour fell the longer the satellites were...CLM-0812A 2020 modelling study of the 1978 NASA/DOE design estimated that its ozone-depleting emissions, almost all from burning rocket fuel at...CLM-0813The paper's detailed component-by-component calculation gives a carbon figure five to six times higher than an older top-down calculation...CLM-0814A 2020 conference paper's own cost model put the whole 60-satellite programme of the 1978 US reference design at about 3.86 trillion US...CLM-0815The 2020 study of the 1978 NASA/DOE design did not count any warming from the microwave beams themselves, saying that is too hard to...CLM-0816In their 2020 study of the 1978 NASA/DOE design, the authors list their own weak points: only whole-system detail rather than part-by-part...More on the source page.