Space Sustainability Ratings: How ESG Frameworks Apply to Orbit

Environmental, Social, and Governance (ESG) frameworks have transformed how terrestrial industries are financed and regulated. A parallel movement is now emerging in the space sector: the systematic rating of satellite operators based on their contributions to, or detraction from, long-term orbital sustainability. The leading instrument is the Space Sustainability Rating (SSR), conceived by the World Economic Forum and developed by a consortium including the European Space Agency, MIT, BryceTech and the University of Texas at Austin. EPFL's Space Center (eSpace) has operated it since 2021.

What Is the Space Sustainability Rating?

The SSR is a voluntary certification system that evaluates satellite missions across multiple dimensions of responsible orbital behavior. It is not a regulatory requirement; it is meant as a market-based complement to hard regulation.

The rating's first iteration evaluates missions on six modules:

• Mission Index
• Detectability, Identification and Trackability (DIT)
• Collision Avoidance Capabilities
• Data Sharing
• Design and Operations Standards
• External Services (counted toward bonus ratings)

Scoring and Certification Tiers

Missions receive a score and a tier: Bronze (40-55%), Silver (55-70%), Gold (70-80%) or Platinum (80-100%). Higher scores reflect sustainability measures beyond minimum regulatory compliance.

Certification is awarded per mission, not per company, recognizing that a single operator may fly missions with different sustainability profiles.

Criticisms and Limitations

The SSR framework faces substantive criticisms that operators should understand:

• Voluntary nature: Without regulatory teeth, operators with the worst sustainability practices have the least incentive to participate and be rated poorly
• Self-reported data: Some inputs to the SSR rely on operator self-disclosure; independent verification is limited
• Constellations vs. one-offs: The rating was designed for individual missions and adapts imperfectly to mega-constellation operators deploying thousands of identical satellites
• Technological vs. behavioral: The framework rewards design choices (propulsion, demisability) but has limited ability to evaluate operational discipline over a multi-year mission

The Regulatory Horizon

Regulators are tightening debris rules alongside the voluntary SSR: the FCC's 5-year post-mission disposal rule applies to satellites launched after September 29, 2024.

Monitor regulatory developments and compliance timelines in the SpaceNexus Regulatory Hub.