Energy Aperture

Value chain · CLM-0005

In plain terms

A second figure of 29 watts per square metre appears in the same report, but it measures electricity produced per unit of land, not beam strength. The two are different things and must not be compared.

The claim as recorded

The 29 W/m2 figure quoted in the same UK document is not a radio-frequency power density but delivered electrical power per unit land area, and the arithmetic here reproduces it: 2 GW over an ellipse of semi-axes 3.35 km and 6.5 km is 2e9 W divided by 6.84e7 m2, which equals 29.2 W/m2.

T0 own calculation · high confidence · as of 2026-09 · VER-005 CONFIRMED 2026-09-04 · VC07, XC03

Scope and limits

Order-of-magnitude confirmation of an interpretation, not a new measurement.

What it assumes

No assumptions are recorded against this claim.

Where it comes from

SRC-023 Space Based Solar Power: De-risking the pathway to Net Zero, 2021

This is the project's own working, shown in full:

CALC-001 The 29 W/m2 figure is land power density, not beam intensity
Source states, p17: "this represents a power density of about 29W/m2, requiring one third of the area compared to the equivalent terrestrial solar power." My calculation: area = pi x 3.35 km x 6.5 km = 68.4 km2 = 6.84e7 m2; 2e9 / 6.84e7 = 29.2 W/m2, which matches the stated 29 W/m2.
Related records
Answers question
QST-001 not published in this release

Cite this

energyaperture.com/c/clm-0005

CLM-0005, Energy Aperture, as of 2026-09.

Connected records

Other published records linked to this one. A list, not a judgement.

Also from SRC-023
CLM-0002The summary report says the beam is strongest at the middle of the receiving site, at about 240 watts per square metre, and argues that...
CLM-0003The report gives the receiving site as an ellipse roughly 7 km by 13 km, and states a beam strength of 245 watts per square metre.
CLM-0006None of the five main studies mentions the international radio-frequency exposure limits, or any safety standard, or a restricted area...
CLM-1436A UK study says that one space solar power system would typically deliver about 2 gigawatts to the grid, and it compares this with the...
CLM-1441Documents give the size of the CASSIOPeiA satellite design as anything from 1 to 2 km across. For a full-size version delivering 2...
CLM-1442A 2021 study for the UK government shows one design, CASSIOPeiA, as about 1.7 km across and 2,000 tonnes, sending 2 gigawatts to the grid...
CLM-1443The 2021 study for the UK government says the leading designs need no new materials, but that building them at a sensible cost needs two...
CLM-1444The 2021 study for the UK government concluded that space-based solar power is technically feasible, affordable at a competitive cost per...
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