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Delivered a state-of-the-art training complex at NAS Pensacola, showcasing capabilities in large-scale infrastructure projects.
60,000 sq ft
HANGAR
Constructed a B-52 research hangar for Boeing, highlighting expertise in advanced engineering and aerospace support.
2022
CERTIFICATION
Achieved one of the first C3PAO certifications, establishing leadership in cybersecurity consulting.
Founded in 1928 by C.H. Guernsey Sr. in his garage in Cherokee, Oklahoma, the firm began by electrifying rural communities.
Survived the 1929 crash and Great Depression by delivering vital municipal engineering projects across rural Oklahoma.
Expanded through mid‑century into power generation stations, utility systems and early adoption of aircraft for on‑site work.
By the 1970s–80s grew capabilities in electric utility, architectural design, construction management and DoD security projects.
Launched its employee‑ownership model in 2016 after achieving a century of service and opening international offices.
Led design on major sports facilities like NBA practice centers for the Oklahoma City Thunder and Toronto Raptors.
Offers multi‑discipline services from civil, structural, electrical, mechanical, environmental engineering to architecture, interior design, planning and consulting.
Specialised in transportation infrastructure, water resources, power engineering and federal/state government facilities.
Culture + Values
Environment + Sustainability
66% reduction
Carbon emissions reduction
The company has reduced its carbon emissions by 66% compared to 1990 levels, demonstrating significant progress toward climate goals.
80% target
Net-zero ambition
Aims to reduce carbon emissions by 80% from 1990 levels by 2050, aligning with broader climate goals.
91% low-carbon electricity
Clean energy supply
In 2023, 91% of electricity supplied was sourced from low-carbon sources like hydroelectric power and renewables.
2024 certification
Carbon management achievement
Achieved Achilles Carbon Reduce certification with science-based targets and verified greenhouse gas data, marking a significant milestone in sustainability efforts.
Committed to supporting States of Guernsey pledge to reach net‑zero greenhouse gas emissions by 2050
Installing community-scale solar panel arrays and phasing electric vehicles into its fleet
Parent company Islands Energy Group launched science‑based carbon emissions reporting and a net‑zero framework with interim targets
Islands Energy Group sustainability strategy includes four pillars: carbon management, customer support, local environment protection, and community investment
Together We Can Fund supports local environmental causes with up to £5,000 grants aligning with UN SDGs and key environmental pillars
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