SYDNEY — NASA plans to keep an experimental expandable module attached to the International Space Station beyond its original two-year lifetime, the agency announced Oct. 2.

In a procurement filing, NASA said it was planning to issue a sole-source contract to Bigelow Aerospace in the first quarter of fiscal year 2018 for engineering and other services related to extended use of the Bigelow Expandable Activity Module (BEAM). The planned contract, whose value was not disclosed, will cover three years with two additional one-year options.

BEAM was launched to the ISS in April 2016 and, a month and a half later, attached to the station and expanded to its full size. NASA planned to keep BEAM at the station for two years in order to perform engineering tests about the suitability of such expandable, or inflatable, modules for future use on the station or other missions. At the end of the two-year period, NASA planned to jettison BEAM and allow it to destructively reenter the atmosphere.

NASA now sees BEAM, in additional to an engineering testbed, as a place for additional storage on the ISS. “BEAM continues to demonstrate positive performance in space and initial studies have shown that it can be used long-term on the ISS to support the government’s needs for on-orbit stowage and for technology demonstrations,” the agency said in its procurement filing.

The agency expects to use BEAM to store more than 100 Cargo Transfer Bags, a standard unit of cargo storage on the station that measures about half a cubic meter. That will free up the equivalent of about four payload racks in other modules of the station for research. NASA will also continue to study the module’s effectiveness for radiation and debris shielding.

There are no plans, though, to use BEAM as a habitation module. Astronauts do regularly enter the module — 13 times since its installation on the station in 2016 — to take readings and collect samples.

The new contract with overlap with the existing contract for BEAM’s original two-year mission. “At the end of the new contract, the agency may consider further life extension or could again consider jettisoning BEAM from the station,” NASA said in a statement about its long-term plans for BEAM.

BEAM is a prototype of larger expandable modules under development by North Las Vegas, Nevada-based Bigelow Aerospace. Company officials have previously said they plan to have their first two B330 modules — so named because each has a volume of 330 cubic meters when expanded — ready for launch in 2020.

While Bigelow’s long-term plans call for the development of commercial space stations using those modules, a B330 could be added to the ISS, possibly to the same docking port currently occupied by BEAM. NASA has proposed that port to commercial module developers, although it has not yet released a plan for allocating that port to companies.

Other companies that have expressed an interest in developing a commercial module for the ISS include Axiom Space and Ixion, a joint effort of NanoRacks, Space Systems Loral and United Launch Alliance.