Value chain · CLM-0195
In plain terms
In 2025 the whole world launched about 2,712 metric tons of satellites into orbit across 325 launches. A single 2010-era plan for solar power satellites assumed that, at its busiest point, over 160,000 metric tons a year and thousands of launches a year would be needed just for that one program. Real-world 2025 launch activity is far below that assumed scale.
The claim as recorded
Global orbital launch activity in 2025 totalled 325 orbital launches and about 2,712,023 kg (about 2,712 metric tons) of spacecraft upmass worldwide across all providers and purposes (SRC-083), which is roughly 1.7% of the "more than 160,000 metric tons per year" peak LEO mass throughput that Chapman's 2010 sunsat deployment scenario (SRC-032) states would be needed at the peak of a program reaching 800 GWe of installed sunsat capacity by 2050, and implies a global 2025 launch cadence about 16 times smaller than the roughly 5,300 dedicated launches per year that scenario's peak throughput implies at the source's suggested payload of about 30 metric tons per launch.
Evidence behind this: T2 (SRC-083, as assigned in register/sources.md); T5 (SRC-032, as assigned in register/sources.md)
Scope and limits
Does not show that 2025 launch activity is behind schedule against Chapman's specific plan; Chapman's text gives no 2025 milestone (his Fig. 1 plots the buildup as a curve and states no value for 2025), and this comparison uses the scenario's peak figure, reached later in his 2015-2050 buildup, so this is an order-of-magnitude sense check, not a schedule-tracking claim. Contains no cost or price data: neither SRC-083 nor SRC-084 has any dollar or price figure anywhere in the document (checked by text search), so this claim is about cadence only, not about whether launch is affordable. Does not establish whether the launch industry could in fact ramp cadence roughly 16-fold if a firm SBSP order book existed; it only establishes the size of the gap between 2025 reality and one 2010-era planning assumption for one modest program.
What it assumes
Assumes BryceTech's "total upmass" (estimated spacecraft mass delivered to orbit, including estimates where mass is not publicly disclosed) is a reasonably like-for-like comparator to Chapman's "mass to be launched each year" to LEO (SRC-032 PDF p.5; sunsat module payload mass); both are payload-mass-delivered-to-orbit measures, not launch-vehicle lift-off mass, so the comparison is mass-to-mass, not lift-off-mass-to-lift-off-mass. Assumes Chapman's stated peak figure (reached some years before 2050 per his Fig. 1, not necessarily by year one of the program) is the right order-of-magnitude comparator, since Chapman's paper gives no explicit year-2025 milestone value.
Where it comes from
(BryceTech, "Global Orbital Space Launches 2025 Year in Review"), infographic page (PDF p.1): "325 Total Orbital Launches", "4,544 Total Spacecraft", "2,712,023 kg total upmass in 2025". SRC-032 (Chapman, "Deploying Sunsats"), PDF p.5 (article p.4): "The throughput to LEO is unprecedented, reaching more than 160,000 metric tons per year (MT/yr). Since the assembly facility in ELEO passes over the equatorial launch site every 98.1 minutes, there are 5,361 direct launch opportunities per year, which suggests an LV with a payload of about 30 MT." Arithmetic: 160,000,000 kg / 30,000 kg per launch is approximately 5,333 launches/year at peak throughput, close to, but not the same quantity as, the 5,361 direct launch opportunities per year (a count of assembly-facility passes over the launch site, from which Chapman infers the ~30 MT payload), i.e. Chapman's own scenario implies on the order of 5,300 dedicated sunsat launches per year at its peak (reached during the 2015-2050 buildup per his Fig. 1, not from year one). Ratio: 5,333 / 325 is approximately 16.4, i.e. the peak launch cadence this one modest sunsat scenario (6-9% of projected 2050 global electricity capacity, per Chapman's own text) assumes is needed is about 16 times the entire world's actual total orbital launch cadence (all providers, all purposes, all countries) in 2025. By mass: 2,712,023 kg / 1,000 = 2,712 MT actual 2025 global upmass, versus the >160,000 MT/yr peak Chapman's scenario assumes, i.e. 2,712 / 160,000 is approximately 0.017 (about 1.7%). Verification: the SRC-083 figures were located by word-level text-extraction coordinates and confirmed by rendering cropped regions of the infographic page as PNGs at 5x zoom; the SRC-032 figures were confirmed by rendering PDF page 5 as a PNG at 4x zoom. All digits matched the raw text extraction with no discrepancies.
Basis: Mass basis: kilograms and metric tons (1 MT = 1,000 kg) of spacecraft/payload mass delivered to orbit. Count basis: number of orbital launch attempts per year. Boundary: SRC-083 figures cover all orbital launch providers and all countries worldwide for calendar year 2025, all payload types and mass classes (including estimated masses where not publicly disclosed), and include unsuccessful launches. SRC-032 figures are Chapman's own model output for one hypothetical sunsat deployment program, not an observed value. This is a physical cadence comparison; no currency is involved.
Related records
- Answers question
- QST-003 not published in this release
Cite this
energyaperture.com/c/clm-0195
CLM-0195, Energy Aperture, as of 2025 (SRC-083 data year, published 2026); compared against a 2010 planning assumption (SRC-032).
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-032
- CLM-0194This 2010 paper predicts that if enough solar power satellites were built to justify mass-producing reusable rockets, launch could...
- Also from SRC-083
- CLM-0236In 2025, all the rockets launched by every country and company in the world together put about 2.7 million kilograms of satellites into...CLM-0533All the rockets in the world together put about 2.7 million kilograms into orbit in 2025, about a fourteenth of the mass of one solar power...