Our Services
Renewable Energy & Power Infrastructure
The following sectors represent areas where Rejkar Group has accumulated substantial project experience. In each one, our team has worked across multiple technologies, geographies, and project types — building the practical knowledge that only comes from doing the work.
Solar PV Plants
01
Solar PV Plants
Solar photovoltaic generation is central to the global energy mix, and delivering PV projects well demands more than familiarity with modules and inverters. It demands a thorough understanding of electrical system design, protection coordination, grid connection requirements, and the practical challenges of large-scale construction. Rejkar Group has that understanding, and we bring it to bear on every project we are involved in — from small commercial installations to utility-scale ground-mounted plants exceeding 100 MW.
We work across fixed-tilt and single-axis horizontal tracker (SAHT) configurations, with all major central and string inverter architectures, and with both conventional MV transformer stations and skid-mounted compact secondary substations. Our involvement typically spans the full electrical scope — from DC string level through the MV collector network to the point of connection with the high voltage grid.
Technical scope:
- DC system design: string sizing, combiner box specification, DC cable sizing and routing
- AC system design: inverter output circuits, MV collector network, step-up transformer sizing
- Energy yield assessment review and P50/P90 production modelling support
- Grid connection engineering and distribution network operator (DNO) liaison
- Protection coordination for MV collector systems and grid connection points
- Earthing and lightning protection design for PV arrays and associated substations
- SCADA and plant monitoring system specification
- Construction supervision and commissioning management
- Owner’s Engineer and Lender’s Independent Engineer services
Wind Plants
Onshore wind energy is a mature and cost-competitive technology, but the electrical engineering required to deliver a wind farm correctly is both specialised and demanding. Collection system design, turbine electrical interfaces, substation integration, protection philosophy, and grid code compliance all require a depth of knowledge that generalist engineering firms often lack. Rejkar Group fills that gap.
We provide electrical engineering and project management support for onshore wind projects from early-stage layout and grid connection assessment through to commissioning and handover. Our team is experienced with the electrical requirements of major turbine manufacturers and with the grid connection obligations imposed by transmission and distribution system operators across multiple markets.
Technical scope:
- Wind farm electrical system design and SLD development
- MV underground cable collection network design, routing, and thermal rating
- Turbine step-up transformer specification and substation integration design
- Wind farm substation layout, equipment specification, and grid connection engineering
- Protection coordination across the MV collection network and HV connection
- Earthing system design for turbine foundations, substations, and cable routes
- Reactive power compensation and power factor correction equipment specification
- Grid code compliance studies and generator performance documentation
- Construction supervision and commissioning support
- Technical due diligence and independent review for lenders and equity investors
Civil and structural scope:
- Wind farm access road design: road geometry, gradient, turning radii, and surface specification for HGV and abnormal loads
- Turbine hardstanding and crane pad design: dimensions, bearing capacity, and surface construction
- Underground cable duct and trench layout across farm terrain
- Substation compound civil design: hardstanding, bunds, fencing, and drainage
- Erosion control, watercourse crossing design, and environmental mitigation measures
- Site drainage and surface water management design
Wind Plants
02
High Voltage Substations
03
High Voltage Substations
High voltage substations are technically complex, safety-critical assets that sit at the heart of any power system. Whether they serve as the grid connection point for a renewable energy plant, the reinforcement node in a distribution or transmission network, or the supply infrastructure for a large industrial customer, getting the engineering right matters enormously. Rejkar Group provides specialist substation engineering across the full voltage range, from 11 kV distribution substations to 400 kV transmission installations.
Our engineers are experienced in both Air Insulated Switchgear (AIS) and Gas Insulated Switchgear (GIS) substation designs, in primary and secondary system engineering, and in the detailed protection and control work that underpins safe, reliable substation operation.
Technical scope:
- Primary substation design: busbar configurations, bay layouts, equipment arrangement drawings
- HV and MV switchgear specification — AIS and GIS technologies
- Power transformer, autotransformer, and shunt reactor specification
- Protection engineering: differential, distance, overcurrent, directional earth fault, and busbar protection
- Relay coordination studies and protection setting calculations
- Secondary systems: control and protection panels, marshalling kiosks, terminal schedules, wiring diagrams
- Substation SCADA, RTU, and telecommunications system design
- Earthing and bonding design compliant with ENA EG1, BS EN 50522, and IEEE 80
- Civil and structural interface specification for substation compound and building works
- FAT attendance, commissioning supervision, and energisation management
Battery Energy Storage Systems (BESS)
Battery energy storage has moved from niche application to mainstream infrastructure asset in a remarkably short period. Grid operators worldwide are now actively procuring BESS capacity to manage frequency, absorb surplus generation, and defer network investment. Developers are co-locating storage with solar and wind to maximise revenue and improve grid compliance. And industrial customers are deploying behind-the-meter storage to control demand charges and improve resilience.
Rejkar Group has developed its BESS engineering capability to address all of these applications. We understand the electrical architecture of utility-scale battery systems, the demands they place on protection and control infrastructure, and the grid code obligations that govern how they must perform. We bring that knowledge to every BESS engagement — from initial concept through to performance testing and commercial operation.
Technical scope:
- BESS technology appraisal and system configuration support (LFP chemistry, container and rack formats, PCS selection)
- DC architecture design and power conversion system (PCS) specification
- MV electrical interface design between BESS and the wider plant or network
- Power management system (PMS) and energy management system (EMS) specification
- Grid code compliance: frequency response capability, reactive power range, fault ride-through performance
- Protection coordination including DC protection, PCS protection, and MV overcurrent schemes
- Fire detection, suppression, and safety system interface design
- BESS container arrangement and civil interface specification
- Commissioning test procedure development, FAT planning, and on-site commissioning oversight
- BESS performance and capacity verification testing
- Owner’s Engineer services throughout EPC procurement and project delivery
Battery Energy Storage Systems (BESS)
04
LV, MV & HV Transmission Networks
05
LV, MV & HV Transmission Networks
The transmission and distribution network is the infrastructure that connects generation to consumers, and its upgrade and expansion is one of the central challenges of the energy transition. Ageing assets, increased renewable connection volumes, new load patterns driven by electrification, and the need for greater operational flexibility are all placing the network under pressure. Rejkar Group helps utilities, network operators, and independent developers to address these challenges through sound, practical network engineering.
We cover the full voltage range from low voltage consumer connections through medium voltage distribution feeders to high voltage transmission circuits. Our team is experienced in both overhead line and underground cable technologies, and in the protection and automation systems that ensure networks operate safely and reliably.
Technical scope:
- LV, MV, and HV overhead line design: conductor selection, structure type, sag-tension calculations, and clearance verification
- Underground cable system design: cable type selection, thermal rating analysis, route planning, and installation specification
- Network capacity and reinforcement studies
- Route selection, corridor feasibility, and constraint mapping
- Protection and automation engineering: feeder protection, auto-reclosers, sectionalising switches, and intertripping schemes
- Network modelling, load flow analysis, and fault level assessment
- Grid connection engineering and offer letter technical review
- Asset condition assessment and life extension or refurbishment specification
- Substation interface engineering for new or modified network connections
- Construction supervision and energisation management
Civil scope:
- Overhead line civil works: pole and tower foundation design, anchor block specification, and way-leave corridor assessment
- Underground cable route civil design: trench depth, bedding, reinstatement, and marker systems
- Road and highway crossing design: open cut and HDD/trenchless crossing specifications
- Watercourse and railway crossing design and permit coordination
- Joint bay and link box chamber construction specification
- Cable pull manhole and draw pit design
Microgrids
A well-designed microgrid is one of the most technically demanding achievements in applied electrical engineering. Combining multiple generation sources, battery storage, and load management within a single coordinated control framework — and making it work reliably in both grid-connected and fully islanded modes — requires engineering capability that spans generation, storage, protection, control, and distribution.
Rejkar Group designs and delivers microgrid solutions for clients where the conventional grid cannot provide the reliability, affordability, or autonomy they require. Our projects cover remote communities, off-grid industrial and mining operations, island power systems, and grid-connected sites seeking to maximise self-sufficiency and resilience. We integrate PV, wind, BESS, and conventional generation into cohesive systems governed by robust power management and protection architectures.
Technical scope:
- Microgrid system architecture definition and technology feasibility assessment
- Generation and storage sizing and optimisation (PV, wind, BESS, diesel, gas)
- Hybrid system electrical design and component integration
- Power management system (PMS) and energy management system (EMS) specification
- Islanding detection strategy, control logic, and grid reconnection sequencing
- Protection philosophy and relay coordination for grid-connected and islanded modes
- LV and MV internal distribution network design within the microgrid boundary
- SCADA and remote monitoring system specification
- Grid code compliance assessment for grid-connected operating mode
- Commissioning management, mode-switching testing, and performance verification
- Owner’s Engineer services for microgrid EPC procurement and delivery