Dual-Use by Design: Telesat Lightspeed and the End of Civilian Telecom in LEO

BY: Evan Grey

On March 17, Telesat announced a significant structural pivot for its Lightspeed constellation. Citing readiness delays with the custom SatixFy ASIC chips powering the onboard processors, CEO Dan Goldberg pushed the network’s full global commercial service to the first quarter of 2028. The more consequential disclosure came alongside it: Telesat is carving out 500 megahertz of military Ka-band spectrum across its initial 156 satellites.

The financial logic is not complicated. Telesat is staring down a $1.7 billion debt maturity wall for its legacy geostationary business in December 2026. With legacy revenues declining and Lightspeed requiring over a billion dollars in near-term capital expenditures, securing a government anchor tenant was less a strategic choice than a survival calculation. Goldberg confirmed on the earnings call that modifying the constellation to meet this demand cost roughly $25 million, representing less than half a percent of the total program cost. For that sum, Telesat swapped 25 percent of its commercial user-link capacity for adjacent Mil-Ka frequencies and resolved its near-term financing problem.

Telesat shares surged 19.5 percent on the Toronto Stock Exchange following the announcement. The market understood what it was seeing. Legacy operators like SES and Intelsat have leased opportunistic capacity to defense customers for years, but that arrangement is functionally different from what Telesat has done here. Lightspeed is hardwiring military spectrum at the payload design level, before the first satellite reaches orbit. When the capital requirements of a LEO constellation reach this scale, the commercial market alone cannot close the financing gap. The conclusion is difficult to avoid: pure civilian telecom in low Earth orbit is no longer an economically viable baseline for a constellation at this scale.

Telesat is not making this calculation in a vacuum. The U.S. Space Force and the Space Development Agency have fundamentally rewritten their procurement doctrine to assimilate commercial capacity. Formalized in the 2024 DOD Commercial Space Integration Strategy, the Pentagon is explicitly incentivizing operators to integrate tactical communications directly onto commercial platforms.

The most visible mechanism for this assimilation is the Hybrid Acquisition for Proliferated Low Earth Orbit program. On February 23, the SDA awarded AST SpaceMobile a $30 million prototype contract to demonstrate direct-to-device tactical satellite communications. The objective is to demonstrate resilient, low-latency tactical communications directly to terrestrial military radios using the company’s commercial BlueBird satellites. Rather than merely buying bandwidth, the government is now paying commercial operators to turn their civilian constellations into active nodes for the Proliferated Warfighter Space Architecture.

However, operators are responding to this demand signal in vastly different ways. Recognizing the inherent friction of dual-use infrastructure, SpaceX launched Starshield, a physically separate, purpose-built military architecture funded by billions in National Reconnaissance Office and Space Force contracts. But building a bespoke sovereign constellation requires limitless capital. For mid-tier operators like Telesat, facing tight credit markets, the only viable option is to merge the sovereign and the commercial onto a single bus. That financial compromise is exactly what creates the geopolitical hazard.

The legal consequences of this architecture deserve careful attention. Under the Law of Armed Conflict, the threshold question for targeting is whether an asset makes an effective contribution to military action. International humanitarian law requires a case-by-case assessment, but terrestrial warfare already provides a grim preview. When an apartment building hosts a military communications node, the entire structure legally becomes a military objective.

The International Committee of the Red Cross has cautioned in its guidance on emerging military technologies that hosting dedicated military payloads can forfeit a commercial satellite’s civilian immunity. A constellation with 25 percent of its user-link capacity hardwired for tactical military communications sits in genuinely ambiguous legal territory. An adversary does not need a definitive legal ruling to act on that ambiguity.

Telesat’s leadership has pointed to multi-year agreements with commercial airlines and maritime logistics operators as evidence that civilian service will continue uninterrupted. There is no reason to doubt those agreements exist. The issue is not service continuity but physical co-location. Civilian aviation traffic will route across the same hardware hosting classified military payloads. The dynamic allocation Telesat describes does not create any separation between those users at the bus level. A commercial airline becomes a passenger on a potential military target without ever being told it boarded.

The danger of this physical co-location extends well beyond a localized service outage. The collateral damage of a kinetic strike in low Earth orbit does not end with the targeted bus. A pulverized satellite creates a high-velocity debris field that threatens the entire orbital shell. When military and civilian infrastructure are physically fused, the proportionality calculus that is supposed to restrain orbital warfare begins to break down. Under international law, a strike is prohibited if the anticipated civilian harm is excessive in relation to the military advantage. Striking a fused dual-use bus substantially increases the likelihood of massive, indiscriminate collateral damage to civilian networks and an escalatory debris cascade known as Kessler syndrome that could render entire orbital bands unusable.

The insurance market has quietly resolved this problem for itself, if not for its customers. Standard space insurance policies carry War and Allied Perils Exclusion clauses that void coverage in the event of a military attack. Lloyd’s market syndicates have treated sovereign conflict as an uninsurable category for decades, and nothing in the current policy architecture accounts for the fact that enterprise customers are now routing critical operations through assets that qualify as military targets under international law. Underwriters are raising premiums for orbital congestion and debris risk. They are not pricing the kinetic risk, because their contracts do not require them to cover it. The exposure sits entirely with the enterprise customer.

The calculus for anyone building or buying capacity in LEO has changed. A constellation that cannot attract a sovereign anchor tenant may not be financeable. One that does, carries legal and physical risks that its civilian customers are not currently equipped to assess. Both sides of that equation are now in view.