Transmission and Distribution Infrastructure

Tetra Tech supports clients across the full lifecycle of infrastructure development for power and gas. We bring together sector-leading engineering, planning, environmental, risk analysis, and health and safety expertise to help our clients deliver resilient energy systems that are future-ready and aligned with Net Zero goals. From policy development and strategic network planning to detailed asset design, our multidisciplinary teams deliver insight-driven, technology-enabled solutions tailored to each location and regulatory context.

Our integrated approach ensures safe, efficient utility connections and infrastructure that support energy transition and enable growth. Whether designing high-voltage transmission systems, advising on underground gas storage, or securing consents for critical infrastructure, we help clients meet energy demand while managing environmental and community considerations.

Electricity Grid and Transmission Networks

We provide end-to-end services for electricity grid development, enabling secure, high-capacity transmission systems that support renewable integration and decarbonisation goals.

• Grid strategy and transmission system planning
• Network capacity and connection assessments
• Consenting and environmental approvals
• Route selection, design, and stakeholder engagement including feasibility and constraints studies
• Digital modelling and geospatial analysis
• Engineering design, project and cost management, and buildability advisory
• Risk analysis and systems studies
• HV cable (land, submarine, and tunnel) studies
• SCADA and telemetry
• Earthing and lightening protection studies

Power and Gas Networks

Our teams deliver technical and environmental solutions across power and gas networks, helping clients maintain reliability and meet regulatory obligations.

• Network feasibility and expansion planning
• Asset integrity and upgrade design
• Regulatory strategy and stakeholder engagement
• Environmental and land access services
• Construction oversight and commissioning support

Underground Gas Storage

We provide specialist services to support the development, operation, and regulation of underground gas storage infrastructure critical to energy resilience.

• Site selection and geological appraisal
• Permitting and environmental impact assessments
• Design integration and hazard management
• Operational risk assessment and optimisation
• Regulatory liaison and ongoing compliance

Electricity and Gas Infrastructure

We design and manage essential infrastructure projects that ensure reliable energy services for homes, businesses, and developments.

• Strategic utility masterplanning
• Multi-utility coordination, routing, and diversions
• Infrastructure delivery strategy and design
• Geospatial mapping and asset data capture for new mains, connections, and network alterations
• Site supervision and quality assurance
• Long-term resilience planning
• Connection design, applications, and interface with utility asset owners

Utility Connections

Our experts support clients through the full utility connection lifecycle from early feasibility to energisation, enabling efficient and cost-effective grid access.

• Maximum demand and peak flow rate calculations
• Connection feasibility studies
• Connection design on behalf of utility owners
• Applications and interface with distribution and transmission operators
• Stakeholder and third-party coordination
• Programme and risk management
• Energisation and handover support

Oil and Gas Infrastructure

Tetra Tech supports the safe delivery and decommissioning of oil and gas infrastructure with a focus on sustainability, compliance, and community engagement.

• Infrastructure consenting and permitting
• Environmental and social impact assessments
• Asset integrity support and decommissioning planning
• Carbon and energy performance advice
• Stakeholder engagement and consultation