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ESDMD #0601: Oxygen Extraction from Lunar Regolith

Long-term, scalable production of oxygen from lunar regolith, targeting about 250 kg a year (bin 6, rating 54 of 57). Oxygen extraction has run for days with highland simulants in thermal vacuum, around TRL 5/6, including NASA's Carbothermal Reduction Demonstration (CaRD). "Long-term operation of these systems has not been enabled." It is named in the Moon Base Users Guide (near-term), under the "ISRU systems" challenge (Tech gaps spreadsheet, ESDMD #0601; Users Guide, p. 13).

Quotations below are from row ESDMD #0601 of the tech gaps spreadsheet unless marked otherwise. ADD Rev C's Appendix D prints the same table for this gap, and it matches the row field for field (ADD Rev C, p. 229).

Description

"Oxygen from lunar regolith has been identified as a potential target to support sustained lunar presence through ISRU. Long-term operation of these systems has not been enabled."

Impacts and benefits: "Without gap closure, oxygen extraction demonstrations may not be able to use scalable techniques to promote potential growth of ISRU in future campaign segments. With gap closure, in-situ sourced O2 would benefit future missions through reduction of delivered mass."

Current state of the art

"Days of operation with highland simulants and Thermal Vacuum Chamber (TVAC) conditions around TRL 5/6, including the Carbothermal Reduction Demonstration (CaRD) project."

CaRD since the spreadsheet. NASA's Lunar Surface Technology page is undated but reports 2026 tests, so it is newer than the spreadsheet. It describes later CaRD work: "In 2025, the project successfully demonstrated the Carbothermal reactor in a thermal vacuum environment." And "In 2026, the CaRD team in partnership with Sierra Space, performed integrated prototype testing that used concentrated solar energy to extract carbon monoxide from simulated lunar regolith, while confirming the production of oxygen through a solar-driven chemical reaction" (Lunar Surface Technology, "Carbothermal Reduction Demonstration (CaRD)"). The page gives no TRL.

Performance target

Moon: "Enable the acquisition, processing, storage and transfer of usable ISRU-generated products at the Moon in a scalable manner. Produce on the order of 250kg oxygen per year to meet Sustained Lunar Exploration habitation target state consumption rates, assuming 4 crew to the surface for 28 days."

The target says "Sustained Lunar Exploration". The Segments column, here and throughout the sheet, says "Sustained Lunar Evolution". The ADD's table has the same two wordings (p. 229).

Child gaps

  • 0601-01*: Preprocessing of granular regolith for ISRU
  • 0601-02: Sensors for monitoring of ISRU processes for oxygen extraction
  • 0601-03*: Regolith-tolerant components for long-duration ISRU processes
  • 0601-04: ISRU system modeling for oxygen extraction

The two starred child gaps also appear under #0604, metal extraction. The asterisk marks "a child gap with multiple parents" (ADD Rev C, p. 199).

Traceability

  • Use cases and functions: UC-I-102 L -- All FN
  • Definition tasks: none listed

Use case UC-I-102 L also appears under #1106 (with FN-I-105 L) and #1107 (with FN-I-107 L), the cryogenic storage and transfer gaps.

Segments and sub-architectures

Priority

Priority bin 6, overall prioritization rating 54 of 57. The rating is "the gap's location in the prioritized list of gaps", so 1 is the highest priority, and bins group gaps of similar priority, bin 1 highest. Criticality, urgency, breadth and depth set the order; cost is not considered (ADD Rev C, pp. 78, 199; method on the gaps index).

Moon Base relevance

The Users Guide names #0601 for one associated challenge (Users Guide, p. 13):

  • "ISRU systems": "Using local lunar resources to enable exploration requires both detailed knowledge of resource availability and systems to extract and process those resources." Also cited: tech gaps #0603, #0604 and #0605, and data gaps DN-006 L and DN-007 L.

The guide ties its challenges to "near-term Moon Base development efforts": missions in phase one "offer opportunities to collect data and mature technologies to enable essential phase two and phase three capabilities" (p. 11). The Users Guide's Phase 1 power section lists "In-situ resource utilization (ISRU) processing" among the uses of surface power, without citing this gap (Users Guide, p. 10). See Technology and knowledge challenges.

Same subject in the Ignition material (the pairing is the wiki's; the deck names no gap). The Moon Base Program's Ignition deck has ISRU as a Phase 3 key mission: "Phase 1 & 2 experiment & demo"; "Phase 3 continue demo and begin implementation"; "Key commodities from regolith: Oxygen, water, rare Earth elements, hydrogen" (slide 35), with "ISRU" labeled on the Phase 3 render (slide 31) (Ignition deck 2, slide 35). Oxygen is the first of its four commodities. The deck gives no production rate to set beside this gap's "on the order of 250kg oxygen per year", and names no project. The ISRU line by phase is on Phases.

Sources

Tech gaps spreadsheet, ESDMD #0601 · ADD Rev C, pp. 78, 199, 229 · Users Guide, pp. 10, 13 · Lunar Surface Technology · Ignition deck 2, slides 31, 35