Polyphase System Inc.
Barrigada Doing business as Psi
- UEI
- MTLDSJ79KNR9
- CAGE
- 4XHX8
- SAM.gov registration
- Active through
Company facts
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- Other NAICS codes in SAM.gov
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- 221111 Hydroelectric Power Generation
- 221112 Fossil Fuel Electric Power Generation
- 221113 Nuclear Electric Power Generation
- 221114 Solar Electric Power Generation
- 221115 Wind Electric Power Generation
- 221116 Geothermal Electric Power Generation
- 221117 Biomass Electric Power Generation
- 221118 Other Electric Power Generation
Show all 22
- 221121 Electric Bulk Power Transmission and Control
- 221122 Electric Power Distribution
- 236220 Commercial and Institutional Building Construction
- 237130 Power and Communication Line and Related Structures Construction
- 238160 Roofing Contractors
- 238220 Plumbing, Heating, and Air-Conditioning Contractors
- 238290 Other Building Equipment Contractors
- 238990 All Other Specialty Trade Contractors
- 334118 Computer Terminal and Other Computer Peripheral Equipment Manufacturing
- 337122 Nonupholstered Wood Household Furniture Manufacturing
- 337214 Office Furniture (except Wood) Manufacturing
- 337215 Showcase, Partition, Shelving, and Locker Manufacturing
- 532490 Other Commercial and Industrial Machinery and Equipment Rental and Leasing
- 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
- SAM.gov registration date
- Physical address
- Barrigada, Guam
- Website
- polyphaseguam.com
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Contract subawards
| Prime contractor | Prime award | Amount | Awarded |
|---|---|---|---|
| Granite-Obayashi 2, A Joint Venture | N6274225F9998 | $942,522 | |
| Granite-Obayashi 2, A Joint Venture | N6274224F9927 | $61,600 | |
| Granite-Obayashi 2, A Joint Venture | N6274223F9922 | $7,231,463 |
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About the company
Polyphase System Inc., doing business as Psi, is a HUBZone-certified, women-owned small business based in Barrigada, Guam that subcontracts as a mechanical, electrical, and HVAC systems provider on military construction and facilities projects. The vendor holds SBA certifications as a Women-Owned Small Business and HUBZone firm, with additional self-certification as a small disadvantaged business.
Psi's federal work consists almost entirely of subcontract awards (75% of recent activity) on military construction programs under prime contractor Granite-Obayashi 2, a joint venture. The vendor delivers mechanical engineering labor, plumbing, heating and air conditioning systems, and electrical works on Department of the Navy Naval Facilities Engineering Command projects. Representative subcontract work includes a January 2026 award for plumbing and HVAC systems across five facilities (Switchgear Building, Fire Pump Building, Security Forces Office, and supporting equipment) for the Guam Defense System Enhanced Integrated Air and Missile Defense Phase 1 program; an October 2024 task order providing mechanical engineer labor for the 9th Expeditionary Support Battalion Equipment and Maintenance Facility construction; and a July 2023 task order for electrical work across five contract volumes on the Ground Combat Element Infantry Battalions 1 and 2 project. The vendor also holds one prime award, a $2.2 million contract from the Department of Commerce National Oceanic and Atmospheric Administration.
The Department of the Navy accounts for 75% of recent award volume (three awards with undisclosed potential value), while NOAA anchors the disclosed dollar figure at $2.2 million. All three Navy awards flow through the Facilities and Infrastructure for U.S. Military Construction Projects vehicle. Combined dollars obligated across the four-award portfolio total $8.2 million, exceeding the stated combined potential value, indicating scope expansion or repricing on existing awards. Activity is sparse — one award every two to three years since 2015 — with the most recent subcontract award in January 2026. The vendor's geographic footprint aligns with its Guam headquarters and Navy work concentration, positioning it as a local HVAC and electrical subcontractor on Pacific theater military construction.
Quick answers
Is Polyphase System Inc. registered in SAM.gov?
Yes. Polyphase System Inc.'s SAM.gov registration is active through August 24, 2027.
On GovTribe
See Polyphase System Inc.'s full federal record
- IDV awards
- Subcontracting relationships
- Funding analysis by agency, NAICS and set-aside
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