Specialized Marine, Environmental, and Underwater Solutions for Critical Energy Assets
Brennan helps utilities, energy producers, and engineers maintain, protect, repair, and build critical assets with marine crews, divers, equipment, and safety-focused planning.
Built for Complex Work Above & Below the Waterline Est. 1919
Energy projects often involve more than one challenge at a time. A single site may require marine construction, underwater inspection, environmental remediation, barge support, specialty access equipment, and careful coordination with engineers, regulators, and facility teams.
Brennan is built for energy.
Since 1919, our crews have supported public and private owners of water-based infrastructure with safe, practical, and technically sound solutions. We understand the demands of active energy facilities, sensitive environments, tight outage windows, remote access points, and infrastructure that cannot afford unnecessary downtime.
Comprehensive Support for Energy Facilities & Systems Energy Infrastructure Services
Brennan provides specialized services across the full energy infrastructure lifecycle, from planning and site preparation to construction, inspection, maintenance, repair, restoration, and long-term asset protection. Every project is delivered with precise execution, professional jobsite management and clear, honest communication that makes Brennan a trusted partner from start to finish.
Submarine Cable Installation, Protection, Inspection, and Repair Submarine Cable Services
Brennan provides surface and underwater support for submarine cable projects, including installation, burial, inspection, repair, maintenance, decommissioning, and removal. We understand the coordination, precision, and environmental awareness required to complete cable work safely from shore to seabed.
With marine construction crews, skilled commercial divers, hydrographic survey capabilities, ROV support, jet sleds, vessels, and strategically located support resources, Brennan helps clients design and execute complex nearshore and underwater cable projects with confidence.
Key Capabilities
- Cable installation and burial
- Route preparation
- Pre-lay grapnel runs
- Civil and shore-end site work
- Staging and support locations
- Pull-in support
- Environmental preservation
- Post-lay cable protection and capping
- Cable repair, decommissioning, and removal
Construction, Repair, and Rehabilitation for Hydroelectric Facilities Hydroelectric Dams
Hydroelectric facilities require specialized support both above and below the waterline. We deliver construction, rehabilitation, inspection, and repair services for hydroelectric dams and related infrastructure, helping facility owners protect performance, extend asset life, and support reliable power generation.
Our experienced welders, ADCI-certified commercial divers, marine construction crews, and specialty equipment allow us to safely complete work on critical dam components in challenging conditions.
Key Capabilities
- Anchoring
- Cofferdams
- Fish passage and protection
- Gates, actuators, and mechanical systems
- Intakes and trash racks
- Golden mussel inspection, response, and eradication
- Major rehabilitation
- Penstocks
- Powerhouse structures
- Spillways
- Tailraces
- Underwater inspection and repair
Commercial Diving Services for Energy Infrastructure Dive Construction & Inspection
When critical energy assets extend below the surface, we provide the visibility, expertise, and field capability needed to inspect, repair, and build with confidence. Our commercial diving teams support energy facilities with underwater construction, structural inspections, condition assessments, repair work, survey support, and detailed reporting.
With more than 120 ADCI-certified divers on staff, trained by the United Brotherhood of Carpenters, we can support planned outages, emergency needs, difficult access conditions, and underwater environments where precision and safety are essential.
Key Capabilities
- Dive inspections
- Underwater construction
- Underwater repair and maintenance
- ROV inspections
- Acoustic imaging
- Bathymetric surveys
- Detailed inspection reports
- CAD drawings, images, and underwater video documentation
- Intakes, outfalls, pipelines, and structural assessments
- Golden mussel eradication
- Near-zero-visibility diving
Marine and Environmental Support for Fossil Fuel, Oil, and Gas Facilities Fossil Fuels, Oil and Gas
Brennan supports fossil fuel, oil, and gas facilities with specialized marine construction, underwater inspection, environmental remediation, and maintenance services. We help facility owners address the complex infrastructure, water access, and environmental challenges that come with operating and maintaining critical industrial assets.
From cooling water systems and traveling water screens to barge terminals, port facilities, pipelines, coal ash ponds, and manufactured gas plant remediation, we deliver safe, efficient solutions tailored to demanding operational environments.
Key Capabilities
- Barge terminals
- Port facilities
- Cooling water systems
- Traveling water screens
- Pipeline installation, inspection, repair, and replacement
- Coal ash ponds
- Manufactured gas plant remediation
- Environmental remediation
- Underwater inspections
- Marine construction and repair
Specialized Underwater & Dive Support for Nuclear Facilities Nuclear Generation Facilities
Nuclear generation facilities require safety, precision, and compliance that leave no room for shortcuts. Brennan employs specialized nuclear power plant divers, dive construction, inspection, repair, and environmental support teams for nuclear facilities and their infrastructure.
Our nuclear divers and experienced project teams support complex work in controlled environments, including visual examinations, underwater repairs, intake and outfall support, cooling pond dredging, fish passage, protection, coating applications, and maintenance of critical facility components. Brennan is approved to perform safety-related work in accordance with ASME NQA-1 (2022), 10 CFR 50 Appendix B, and 10 CFR Part 21
Key Capabilities
- Coating application
- Cooling pond dredging
- Condensate storage tanks
- Fish passages, deterrents and protection systems
- Fuel transfer systems
- Intakes and outfalls
- Reactor components
- Traveling water screens
- Valves and seals
- VT-1 and VT-3 visual examinations
- Nuclear Quality Assurance program
- Maritime security barriers
Access, Construction, and Support for Water-Based Grid Infrastructure Transmission & Distribution
Transmission and distribution work in rivers, marshes, wetlands, and other sensitive environments requires a contractor that understands both infrastructure and access. Brennan helps utility companies, engineers, and contractors support grid reliability with marine construction, amphibious access, deep foundations, shoring, scour remediation, and underwater inspection services.
Our crews can work in remote, low-clearance, environmentally sensitive, and water-based conditions where traditional equipment may not be practical. That means fewer access limitations, better constructability, and practical solutions for complex grid-hardening projects.
Key Capabilities
- Geotechnical support
- Marsh and wetland site access
- River crossings
- Scour remediation
- Transmission tower foundations
- Tower removal and replacement
- Utility pole shoring
- Deep foundations
- Amphibious equipment access
- Marine construction support
- Underwater inspections
Protecting Critical Energy Assets in Harsh Marine Environments Maritime Security Barriers
Critical energy infrastructure must be protected from both environmental forces and security threats. Brennan helps utility companies, engineers, and contractors support grid reliability with marine construction, amphibious access, deep foundations, shoring, scour remediation, and underwater inspection services.
As the exclusive supplier of Harbor Offshore Barriers™, Brennan supports fixed and floating barrier systems for critical assets that require proven protection against vessel impact, unauthorized access, and marine-based threats.
Key Applications
- Dams and hydropower plants
- Nuclear power plants
- LNG, oil, and transport facilities
- Chemical plants
- Military facilities and installations
- Bridges
- Shipyards
- Airports
- Desalination plants
- Other critical marine infrastructure
Restoring and Protecting Waterways Around Energy Infrastructure Environmental Restoration
Energy infrastructure often sits directly within or alongside sensitive waterways, wetlands, shorelines, and industrial sites. Brennan helps clients restore, protect, and improve these environments through environmental remediation, habitat restoration, wetland remediation, dredging, capping, dewatering, water treatment, and site-specific restoration support.
We combine marine construction experience, environmental expertise, specialized equipment, and a practical understanding of regulatory and stakeholder expectations. The result is a restoration partner built for complex water-based work.
Key Capabilities
- Habitat restoration
- Wetland remediation
- Marsh restoration
- Environmental dredging
- Contaminated sediment removal
- Sand covers and capping
- Dewatering
- Water treatment
- Coal ash ponds
- Cooling ponds
- Manufactured gas plant remediation
- Hydrographic survey and underwater inspections
One Partner for Complex Energy Challenges Why Brennan for Energy Infrastructure?
Energy infrastructure projects require more than equipment and manpower. They require collaborative planning, coordination, technical skill, safety discipline, and the ability to work in environments where access is limited and risk must be mitigated and limited.
Brennan brings together skilled marine construction professionals, commercial divers, environmental specialists, hydrographic surveyors, and specialized equipment under one experienced team. Our integrated, transparent approach helps energy producers more easily schedule work, improves overall communication, and keeps energy generation moving.
What Sets Brennan Apart
- Award-winning performance in safety-critical environments
- Transparent project communication from planning through closeout
- Specialized capabilities across marine, dam, energy and environmental infrastructure all on one team
- Collaborative, honest delivery with owners, engineers and project partners
- Advanced underwater inspection, ROV, survey, and imaging capabilities
- Proven innovative problem solving to keep projects moving
Total Quality Management Across the Organization
- ISO 9001 (Quality Management Systems)
- ISO 14001 (Environmental Management Systems)
- ISO 45001 (Occupational Health and Safety Management Systems)
- Approved to perform safety-related work in accordance with ASME NQA-1 (2022), 10 CFR 50 Appendix B, and 10 CFR Part 21
What Our Customers Are Saying Client Testimonials
Serving Coastal & Inland Waterways Office Locations
Bring Brennan Into Your Energy Infrastructure Project
Whether you need support for a hydroelectric dam, nuclear facility, submarine cable, transmission crossing, fossil fuel site, oil and gas facility, maritime security barrier, or environmental restoration project, Brennan has the people, equipment, and expertise to help you move forward safely and efficiently.