Washington, DC

A standby generator yard built around what the surveys missed.

JS Global designed and built a 900-kW standby generator system and screened generator yard on the grounds of an occupied federal building, and resolved an unmapped underground obstruction found days after mobilization.

900-kW
standby power
  • Historic federal grounds
  • Design and construction
  • Screened generator yard
Emergency PowerSite Construction
Project Overview

Emergency power has to be dependable and nearly invisible.

The generator had to serve critical building systems and look like it belonged on historic grounds.

JS Global designed the generator yard, managed the geotechnical, design, and testing subcontractors, and self-performed the electrical feeder raceways. The site jurisdiction required architectural screening and a generator finish matched to the adjacent historic building.

Project Snapshot

The assignment at a glance.

LocationWashington, DC
FacilityOccupied federal building on historic grounds
Project TypeStandby generator and enclosed generator yard
Scope900-kW generator, about 700 linear feet of emergency feeders, new 1600A automatic transfer switch
Primary ConstraintSite jurisdiction approval, minimal laydown, unmapped underground obstruction
DeliveryDesign and construction, with self-performed electrical feeders
RolePrime contractor
The Challenge

Build on historic grounds that did not match the drawings.

01

Win approval for the generator location and yard design from the site jurisdiction.

02

Work beside active building parking and a loading dock with no field trailer and minimal laydown.

03

Match the generator finish and screening to the adjacent historic building.

04

Respond when the caisson drill struck an abandoned manhole that no utility survey showed.

The Approach

Stop, solve, document, and carry it through review.

  1. 01

    Feed

    Emergency power feeders were routed along an existing loading dock tunnel to a new automatic transfer switch.

  2. 02

    Design

    When the generator was relocated, JS Global designed the new yard and carried it through permitting and safe-dig approval.

  3. 03

    Pause

    When the drill struck the abandoned manhole, work stopped and the team developed a solution acceptable to the jurisdiction’s engineering division.

  4. 04

    Review

    The drawing set expanded to include architectural elevations and electrical drawings, and the submittal went through six review rounds to approval.

  5. 05

    Prove

    Factory and field load bank testing, a building load transfer test, owner training, and record documents closed out the work.

The Result

Reliable standby power, approved for historic grounds.

01

A 900-kW standby generator system and enclosed yard now back up the building.

02

Emergency feeders connect the generator to a new 1600A automatic transfer switch and to critical air handling equipment.

03

The architectural screening and generator finish were approved by the site jurisdiction.

04

Load bank testing and a full building load transfer test were completed, with training and as-built documents delivered.

What Made It Work

Surprises were handled by the book.

No survey showed the obstruction, so the team stopped, solved it with the approving engineers, and documented the solution.

That discipline, together with a design package built to satisfy several reviewers at once, carried the generator yard through six review rounds to approval.

Project Questions

Building emergency power on historic grounds.

Practical answers about approvals, unexpected conditions, and commissioning.

01Why was the work done in stages?
The task order was awarded before the site jurisdiction approved the generator location. Interior feeder work was completed first, work then paused for approval, and JS Global was later assigned the design of the relocated yard.
02What happened when the obstruction was found?
Work stopped. JS Global developed a solution acceptable to the jurisdiction’s engineering division and expanded the drawing set before work resumed.
03What did closeout include?
Factory and field load bank testing, a building load transfer test, owner training, operations and maintenance manuals, and as-built record documents.
Plan for the Unknowns

Building critical infrastructure on a historic or constrained site?

Share the site conditions, approval path, access limits, and schedule. JS Global will help plan for the reviews and the surprises that come with them.

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