Underground Utilities

Safe delivery of products and services is a primary concern. TSU has completed all of its projects with zero accidents, injuries, recordable incidents or lost time. We will meet or exceed all of our customers' safety requirements. TSU participates in ISNetworld, PICS Auditing and Edison Electrical Institute and has a Federal Cargo Tank License.


Recent Projects


  • 11,000 1/ft. of 5", 12 duct, concrete-enclosed underground primary, manhole vault install, brick and concrete sidewalk restoration in downtown Portsmouth, NH.
  • 14,000 1/ft. of 3" underground primary, secondary power conduit with transformer and sector foundations. Full roads and green space restoration in Jaffrey, NH.
  • 18,000 1/ft. of 3" and 5" underground primary, secondary power conduit with transformer and sector foundations including street lighting, management or contaminated soils, street/asphalt and green space restoration in Keene, NH.
  • 4" gas line for new underground parking facility at Spruce Peak at Stowe, VT.
  • 3" and 4" MDPE gas lines, with 3" MDPE nitrogen and methanol carrier sleeves at Timken Aerospace, Lebanon, NH.

TSU self-performs all restoration including:


  • Asphalt trench restoration
  • Curbs and Sidewalk replacement
  • Poured Concrete, flat and formed
  • Retaining walls
  • Green space restoration and enhancement
  • Ditching and Drainage
  • Telecommunications and power duct banks
  • Switching station pad sites
  • Wireless communication sites
  • Manhole Vaults
  • Transformer and sector foundations
  • Substation upgrades and expansions
  • Drainage installation
  • Catch basin installation and repairs
  • Site Utilities
  • Municipal road ditching and drainage culvert repair/replacements
  • Directional Boring Support
  • HDPE and MDPE pipe fusion

Twin State Utilities Corp. has several Hazwoper 40 certified crews for dealing with environmentally difficult and hazardous site work. Called upon to manage utility projects with contaminated soils has offered TSU customers another avenue to enjoy single source service delivery. Additionally, TSU has Northeast Gas Association certification in pipe fusion for any MDPE and HDPE pipe needs.


Our shop in Hartland, VT enables us to provide home-based services to our customers, materials, storage, and restoration stockpiles. Contact TSU for any or all of your underground utility, site, drainage or metering/calibration needs. Please see our Contact Us page for more information.