Mercury Engineering
Dublin contractor that runs general contracting, CSA, mechanical, electrical and offsite assembly under one roof, and handed over Digital Realty’s 76 MW Paris Digital Park in 2025.
Facts
Source per value- Contractor type What the firm is when it leads a data center job: a general contractor or construction manager, an engineer-constructor that designs and builds under one EPC contract, a design-build specialist focused on advanced-technology facilities, or an electrical contractor that holds the prime contract.
- General contractor 1
- ENR telecom rank # Rank on ENR's 2026 Top 20 Contractors by Sector: Telecommunications, ranked by 2025 revenue. ENR's telecom sector covers data centers, cabling and towers, and ENR credits the data center buildout for the sector's 86.4% growth in 2025.
- Not published
- Telecom/DC revenue 2025 $M 2025 telecommunications-sector revenue in US$ millions as ENR published it in the 2026 Top 20 by Sector table (data centers sit in this sector).
- Not published
- Top 400 rank # Overall rank on ENR's 2026 Top 400 Contractors list (May 25, 2026 issue), ranked by 2025 US and international construction revenue.
- Not published
- Top 400 rank (2025 list) # The firm's rank on the 2025 Top 400 list, as printed beside its 2026 rank. A drop in the number is a climb up the list.
- Not published
- Telecom/DC share % Share of the firm's 2025 Top 400 revenue that came from ENR's telecommunications sector (data centers, cabling, towers), as printed in the Top 400 table.
- Not published
- CM-at-risk share % Share of the firm's 2025 revenue delivered as construction manager at risk, as printed in the ENR Top 400 table.
- Not published
- Total revenue $M Company-wide annual revenue in US$ millions for the year in Revenue year, from the company, its filings or ENR. Non-USD figures are converted at the rate stated in Revenue note.
- Not published
- Revenue year Year (or fiscal year) the total revenue covers.
- Not published
- Revenue note Basis of the total revenue: which entity, fiscal year end, and any currency conversion.
- Not published
- Delivery models Published contracting methods or delivery services. A named project supports that project’s model; company service pages describe broader capabilities. CM-at-risk shares from ENR are company-wide, not data-center-only.
- General contracting 1
- Design-build Offers design-build or EPC delivery (one contract for design and construction), per the firm's own pages.
- Not published
- CM at risk Offers construction management at risk (guaranteed maximum price), per the firm's own pages.
- Not published
- Self-perform trades Own-crew or in-house subsidiary capabilities stated by the firm. Company-wide capabilities are not proof they were used on every data center. Unspecified trades remain explicitly unspecified; scope and subsidiary qualifiers are preserved.
- Mechanical, Prefab/modular (bespoke fabrication facility) 3
- Self-performs electrical Performs electrical work with its own crews or an in-house electrical subsidiary, per the firm's own pages.
- Not published
- Markets Regions where the firm builds data centers, from its own office list or project pages: North America, Latin America, Europe, Middle East, APAC.
- Europe 1
- Data center track record The firm's own headline data center claim with its basis kept intact: MW delivered, projects completed or square feet built, and whether it is cumulative, annual or delivered-or-underway.
- General contractor for Paris Digital Park, La Courneuve: 76 MW across PAR8–PAR11, full campus handed over in 2025; data centers in Germany, France and the Netherlands 2
- MW claimed MW The megawatt number in Data center track record, for sorting. Bases differ (delivered, annual, underway); read it with the track record text.
- Not published
- Named data center clients Data center owners, operators or tenants the firm or its client has publicly named on a project. Confidential clients are never inferred.
- Digital Realty 2
- Ownership Who owns the firm: its employees (ESOP or employee shareholders), a family or private holders, public shareholders, or a listed parent group.
- Not published
- Employees Headcount as the firm or its parent reports it (whole company, not data center staff).
- Not published
- Headquarters Head office city and country as the firm states it.
- Dublin, Ireland 1
- Reference project Named data center project. Kept separate from company-wide portfolio claims.
- Paris Digital Park, La Courneuve, France 2
- Reference capacity and basis Published capacity of the reference project, preserving planned, ultimate and phase qualifiers. Not a delivered portfolio total.
- 76 MW delivered across PAR8, PAR9, PAR10 and PAR11 2
- Reference project status Status stated by the cited project source; an announcement does not establish completion.
- Not published
- Reference completion Published project completion date or forecast, preserving the source’s qualifier.
- Full campus handed over in 2025 2
- Reference project area Area of the reference project in square metres, as stated by the source.
- Not published
- Reference delivery scope Construction responsibilities described by the project or capability source. Delivery scope does not by itself establish a design-build contract.
- General contractor for shell-and-core, MEP fit-out and commissioning 2
- Corporate status Published corporate name or structure change, with announcement and effective dates kept distinct.
- Not published
Sources
- Mercury home accessed 2026-11-11
- Mercury: Paris Digital Park accessed 2026-11-11
- Mercury: Mechanical services and off-site fabrication accessed 2026-11-11
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