01Project overview & context
Overview
Project summary
SgurrEnergy was appointed as Owner’s Engineer for a 1,400 MW utility-scale solar PV project in Rajasthan, India. The multidisciplinary assignment covered technical review and coordination of the complete DC and AC systems, 33 kV collection network, 400 kV substation and 400 kV transmission line. SgurrEnergy also assessed multiple module and inverter makes and two mounting technologies — single-axis trackers and fixed-tilt structures. Block-wise engineering packages enabled parallel technical review and supported efficient design closure, procurement coordination and project execution.
Project context
The 1,400 MW development is a large utility-scale solar PV project in Rajasthan, incorporating multiple PV module and central-inverter makes, block-wise plant engineering and both single-axis tracker and fixed-tilt mounting systems. Power collection and evacuation requirements extend from the plant’s DC and AC networks through a 33 kV collection system to a 400 kV substation and associated transmission line.
At the time of SgurrEnergy’s engagement, the project required coordinated technical oversight across electrical, civil, structural and equipment interfaces. The scale of the development, the use of alternative equipment configurations and the need to progress multiple engineering packages in parallel made disciplined review, standards compliance and closure management central to the assignment.
Client objectives
- Establish consistent technical governance across a 1,400 MW multi-block solar development.
- Coordinate the interfaces between DC systems, AC systems, the 33 kV collection network and 400 kV evacuation infrastructure.
- Validate module, inverter, tracker and fixed-tilt design configurations against project requirements.
- Progress engineering reviews and technical approvals efficiently across parallel project packages.
- Optimise structural quantities while maintaining applicable design criteria and compliance.
Key challenges & considerations
Scale and Parallel Engineering Packages
The project’s capacity and block-wise configuration required multiple engineering packages to advance concurrently, needing coordinated workflows and disciplined comment closure.
Electrical and Grid-Evacuation Interfaces
The complete power path — from PV strings and inverter blocks through the 33 kV collection network to the 400 kV substation and transmission line — required consistent system assumptions and coordinated protection, metering, earthing and SCADA.
Multiple Equipment and Mounting Configurations
The use of Waaree and GREW N-type TOPCon modules, Sineng and Sungrow central inverters, Nextracker single-axis trackers and fixed-tilt structures created multiple design combinations requiring compatibility review.
Structural Optimisation
The mounting-system design required a balance between structural efficiency, applicable design criteria, constructability and long-term reliability.
02Engineering scope & delivery
Role & engineering approach
Independent engineering role
SgurrEnergy’s role
SgurrEnergy served as the Owner’s Engineer, providing multidisciplinary design review, technical coordination and engineering governance across the project’s design and procurement stages. The team reviewed the complete DC and AC electrical systems, 33 kV collection network, 400 kV substation and 400 kV transmission line, together with PV-side equipment and mounting-system configurations.
Electrical, civil and structural specialists assessed design assumptions, calculations, drawings, technical specifications and vendor documents; coordinated discipline and equipment interfaces; and managed technical comments through closure. SgurrEnergy’s independent position supported objective review of alternative module, inverter and mounting-system configurations.
Our engineering approach
SgurrEnergy applied a multidisciplinary and package-based review approach suited to the scale of the development. Design assumptions were assessed at system level and then traced through the electrical, civil, structural, substation and transmission-line packages, identifying inconsistencies at discipline boundaries and prioritising matters with the greatest effect on compliance, constructability, procurement or programme.
Block-wise layouts and engineering packages allowed technical reviews to progress in parallel. Review comments were recorded, assigned and tracked through closure, creating a transparent technical-governance trail. Alternative module, inverter and mounting-system configurations were assessed against the project design basis, while structural evaluation focused on efficient use of material without compromising applicable requirements.
Scope of services & deliverables
Design Basis and Engineering Coordination
- Review of design criteria, design-basis documents, single-line diagrams and system architecture.
- Coordination of multidisciplinary and package interfaces.
- Review-comment management, technical clarification and design closure.
- Assessment of applicable standards and project-specific compliance requirements.
DC and AC Electrical Systems
- Review of DC and AC system design and equipment sizing.
- Assessment of module and inverter configurations.
- Review of cable sizing, routing, schedules and associated calculations.
- Review of earthing, lightning protection, protection, metering and SCADA requirements.
Collection and Evacuation Infrastructure
- Engineering review of the 33 kV collection network.
- Review of the 400 kV substation design and associated systems.
- Review of the 400 kV transmission-line engineering and interfaces.
- Coordination of plant, substation and transmission-line design boundaries.
Civil, Structural and Mounting Systems
- Review of Nextracker single-axis tracker and fixed-tilt mounting configurations.
- Assessment of structural design calculations and member optimisation.
- Review of foundations and relevant civil-structural interfaces.
- Constructability and design-coordination review across project blocks.
Procurement and Vendor Engineering Support
- Preparation or review of engineering calculations and technical specifications, as applicable.
- Technical bid evaluation and equipment-compliance assessment.
- Review of supplier and vendor engineering documents.
- Technical clarifications and support for procurement decisions.
Project configuration
- Waaree and GREW N-type TOPCon PV modules, 580 Wp.
- Sineng and Sungrow central inverters.
- Nextracker single-axis trackers and fixed-tilt structures.
- 33 kV collection network; 400 kV substation and transmission line.
03Value & outcome
Structural Efficiency
Detailed evaluation and optimisation of the mounting-system design reduced structural-steel tonnage while maintaining the applicable structural and design requirements.
Faster Parallel Review
Block-wise layouts and engineering packages enabled parallel review across the development, supporting faster technical approvals and clearer closure ownership.
Improved Interface Control
Integrated review across the DC and AC systems, collection network, substation, transmission line and mounting systems improved visibility of cross-discipline dependencies.
Procurement Confidence
Structured review of technical specifications, equipment configurations, bids and vendor documents helped the client coordinate procurement decisions with the approved engineering basis.
Project outcome
SgurrEnergy’s multidisciplinary Owner’s Engineering support strengthened technical coordination across the 1,400 MW project and its associated 33 kV and 400 kV infrastructure. The block-wise approach allowed multiple engineering packages to be reviewed in parallel, supported structured design closure and improved visibility of electrical, civil, structural and equipment interfaces.
Why SgurrEnergy
- Independent engineering judgement, separate from EPC, OEM and equipment-supply interests.
- In-house multidisciplinary capability across solar, electrical, civil, structural, grid and transmission engineering.
- Experience coordinating complex utility-scale renewable energy projects and multiple engineering packages.
- Structured technical governance, document review and comment-closure processes.