Infrastructure engineering
Infrastructure Engineering: HV Connectivity, Substation, Backup & BESS Architecture
We translate the load and supply strategy into buildable infrastructure — HV interconnection design, substation and switchgear architecture, diesel/BESS backup hierarchy, and fast-response power electronics — so the campus meets uptime, ramp-rate and grid-code requirements from day one.
Typical duration · 8-12 weeks for basic engineering package; extends to 16-20 weeks where dual-source HV interconnection or utility approvals are involved
Samples generated 05 Sept 2026, 11:27 pm ISTWhat happens in this step
- 01Review load/reliability baseline and supply strategy outputs to fix firm capacity, redundancy tier and ride-through requirements
- 02Develop HV interconnection concept — voltage level, single vs. dual circuit, switchyard bay configuration and DISCOM/CTU interface points
- 03Size and architect the backup stack: DG sets, UPS, BESS blocks and their sequencing/priority logic for N+1 or 2N configurations
- 04Model BESS sizing for ride-through, frequency response and peak shaving using site load profiles and grid disturbance data
- 05Prepare basic single line diagrams (SLDs), protection philosophy and earthing/lightning concept for substation and BESS yard
- 06Coordinate with civil/structural teams on substation layout, container yard footprint, cable routing and fire/thermal separation
- 07Issue basic design package with equipment specifications, load lists and interface schedules for detailed engineering and procurement
Infrastructure engineering · on the ground
Video · David Pickup | Advertising & Marketing 🇬🇧 / PexelsWhat we need from you
- Confirmed firm load, growth roadmap and reliability tier from load/reliability baseline step
- Selected supply strategy (grid-only, grid+captive, hybrid RE+BESS) and contracted capacity
- Site layout, available land for substation/BESS yard, and any space constraints
- Grid code and DISCOM/CTU technical requirements for the proposed voltage level
- Existing site electrical single lines (for brownfield/expansion projects)
- Preferred equipment standards or existing OEM relationships (switchgear, PCS, BESS)
- Target commissioning date and any phased capacity ramp-up plan
Worked example (anonymised, illustrative)
48 MW Tier-III Data Center Campus — HV Substation & BESS Backup Architecture · 48 MW IT load / 20 MW-40 MWh BESS / 132 kV dual-circuit interconnection · Southern India
Illustrative campus requiring 2N electrical redundancy, sub-second ride-through and BESS-backed UPS bypass ahead of DISCOM 132 kV interconnection.
Sample deliverables from this step
Every sample below is analyst-written and anonymised for illustration — structure and depth mirror our real deliverables; figures and names are not from any client engagement.
Illustrative · Growthifye-preparedHV Interconnection & Substation Basic Design Package
Single line diagrams, bay schedules and protection philosophy for the 132 kV switchyard and step-down substation feeding the campus.
Sample excerpt · Substation Equipment List (Extract) — illustrative figures
| Tag | Equipment | Rating | Qty | Standard |
| SWG-01 | 132 kV GIS bay | 132 kV, 2500 A, 40 kA | 4 | IEC 62271 |
| TR-01/02 | Power transformer | 132/33 kV, 40 MVA | 2 | IS 2026 |
| PT-01 | Potential transformer | 132 kV, 0.2 accuracy | 4 | IEC 61869 |
| BUS-01 | 33 kV indoor switchgear | 33 kV, 1250 A, 31.5 kA | 1 board | IEC 62271-200 |
| EARTH-01 | Substation earth grid | <1 ohm target | 1 lot | IEEE 80 |
- Basic design only; detailed protection settings issued at detailed engineering stage
- Dual-circuit routing assumed pending DISCOM feasibility confirmation
Illustrative · Growthifye-preparedBESS & Backup Power Sizing Report
Sizing calculations and topology comparison for BESS, UPS and DG hierarchy to meet ride-through and N+1/2N redundancy targets.
Sample excerpt · Backup Power Sizing Summary — illustrative figures
| Element | Duty | Sizing Basis | Result |
| BESS block | Ride-through + frequency response | 15 min at full IT load | 20 MW / 40 MWh, 33 kV coupled |
| UPS modules | Instantaneous transfer | N+1 modular | 6 x 1.5 MW modules |
| DG sets | Extended outage backup | 72 hr autonomy target | 8 x 2.5 MW sets |
| Fuel storage | DG runtime | 72 hr at full load | 3 x 50 kL tanks |
| Transfer time | Grid-to-BESS-to-DG | <10 ms UPS bypass | Confirmed via simulation |
- Sizing validated against historical grid disturbance data for the region
- BESS chemistry assumed LFP for cycle life and thermal safety margins
Fast-Response Power Electronics & Control Architecture Memo
Defines the control hierarchy and communication architecture linking BESS PCS, UPS and DG controllers for seamless mode transitions.
Sample excerpt · Control Hierarchy Summary — illustrative figures
| Layer | Function | Response Time | Protocol |
| Plant controller | Overall mode arbitration | <100 ms | IEC 61850 |
| PCS controller | BESS charge/discharge | <20 ms | Modbus TCP |
| UPS controller | Static bypass switching | <10 ms | Proprietary/CAN |
| DG controller | Start/sync sequencing | <10 s | IEC 61850 |
- Assumes single vendor SCADA integration; multi-vendor adds interface testing scope
Commissioning & Integration Schedule
Milestone schedule sequencing substation energization, BESS commissioning and full load bank testing ahead of go-live.
Sample excerpt · Commissioning Milestones (Extract) — illustrative figures
| Milestone | Target Week | Dependency |
| Substation energization (no-load) | Week 30 | GIS + transformer delivery |
| BESS PCS factory testing | Week 26 | Container yard civil complete |
| Integrated load bank test | Week 34 | UPS + BESS + DG tied in |
| Full N+1 failover test | Week 36 | All controllers integrated |
| Grid parallel operation approval | Week 38 | DISCOM inspection sign-off |
- Schedule assumes no major equipment lead-time slippage
- DISCOM inspection timelines are indicative and vary by state
Outcomes
- Buildable HV interconnection and substation design aligned with DISCOM/CTU technical requirements
- Backup power architecture sized to actual load profile, avoiding over- or under-provisioning of BESS/DG/UPS
- Clear control hierarchy enabling seamless transition between grid, BESS and DG under disturbance conditions
- Design package ready for detailed engineering, procurement and construction (EPC) tendering
Questions clients ask
Do you design for a specific BESS chemistry or vendor?
We remain vendor-agnostic at this stage; sizing and architecture are defined first, then translated into technology-neutral specifications for competitive procurement.
Can this step run in parallel with supply strategy finalisation?
Basic HV and substation concept work can start once indicative capacity is known, but final sizing is frozen only after the supply strategy and contracts are confirmed.
What level of detail does the basic design package include?
It covers single line diagrams, equipment ratings, protection philosophy and layout concepts sufficient for EPC tendering; detailed engineering (relay settings, cable schedules) follows in a subsequent phase.
