Infrastructure sector
System sizing and configuration, electrical balance of plant, civil works and grid interconnection for grid-scale and hybrid battery storage, coordinated with the battery OEM and specialist parties.
Each project states which of these it includes. They can be taken together or separately.
Where offered for a project: translating the application into power and energy ratings. We work through the MW and MWh requirement, usable capacity and depth of discharge, round-trip efficiency, auxiliary consumption, duty cycles and the degradation the project assumes, then propose a block configuration with the OEM’s data.
PCS and MV step-up transformer interfaces, MV switchgear and collection, SLD, auxiliary supply, cables, earthing and lightning protection, protection and control, metering, SCADA/EMS/PMS interfaces, and the connection to a pooling or grid substation, together with the associated civil works.
Review of OEM and supplier documents, safety and fire-protection compliance reviews against the project requirements, HVAC and auxiliary interfaces, and commissioning and performance-validation support as agreed. Statutory approvals and certified studies remain with qualified specialists.
BESS capacity sizing (MW/MWh) is not the same as sizing the 220 V / 48 V station battery of a substation. Cell, module and BMS details remain with the OEM, and certified fire studies and statutory approvals with qualified specialists and the authorities. No BESS project is claimed.
Electrical discipline: full lists Civil & structural: full lists Studies
| Input | Typically from | Used for |
|---|---|---|
| Application and service requirement (shifting, firming, frequency support) | Owner or EPC contractor | Sizing basis and duty cycle |
| Required MW, MWh and duration at the connection point | Owner, connection approval | Sizing and configuration |
| Battery and PCS data, efficiency, auxiliary loads, degradation | OEM | Installed capacity, auxiliary design |
| Connection point, fault level, grid requirements | Utility, system study | SLD, protection, metering, studies |
| Site layout, soil data, spacing and safety requirements | Owner, OEM, applicable codes | Block layout, civil design, earthing |
Confirm application, ratings, connection point and the scope split with the OEM.
Relate required MW and MWh to installed capacity, with stated assumptions.
Arrange blocks, PCS and transformers with OEM spacing and access requirements.
SLD, MV collection, auxiliaries, cables, earthing, protection and metering.
Foundations, plinths, trenches, drainage and roads from vendor loads and soil data.
BMS, PCS, EMS and SCADA signal lists; connection bay at the pooling or grid substation.
OEM document and safety compliance reviews; test procedure review and support as agreed.
Why sizing assumptions matter. Installed energy is larger than the energy delivered at the connection point. Depth of discharge, efficiency, auxiliary consumption and degradation each reduce it, so the sizing report states every factor and its source.
A typical split. The contract and the OEM agreement decide the actual boundaries.
| Item | CoreGrid (as contracted) | Battery OEM | Specialists and authorities |
|---|---|---|---|
| Cells, modules, racks, BMS, container internals | — | Design and supply | — |
| Sizing basis and configuration | Prepare or review | Provide data and confirm | — |
| PCS, transformer and switchgear interfaces, SLD | Prepare | Provide PCS data | — |
| Auxiliary supply, cables, earthing, lightning protection | Prepare | Provide auxiliary loads | — |
| Foundations, plinths, trenches, drainage | Prepare | Provide loads and fixings | — |
| Protection, control, EMS/SCADA interface lists | Prepare | Provide BMS/PCS interface data | Utility requirements |
| Fire protection and safety | Compliance review | Provide safety documentation | Certified studies and approvals |
| Commissioning and performance tests | Procedure review and support, as agreed | Perform tests on its system | Witness where required |
On a hybrid renewable project, the BESS often connects to the same pooling substation as the solar or wind plant. The storage blocks connect through PCS units and MV transformers to a 33 kV feeder or a dedicated bay on the pooling substation’s collector bus. Its power then shares the pooling transformers and evacuation line with the plant.
That arrangement means the bay rating, protection settings interface, metering and plant controller have to account for charging and discharging, and the evacuation capacity has to be checked for combined operation. We coordinate the BESS bay with the pooling substation design and with the EMS or plant controller interface.
BESS sizing, auxiliary load and transformer sizing, cable sizing, earthing study.
BESS SLD, block layout and spacing plan, earthing and lightning layout, foundation drawings.
Auxiliary load list, cable schedule, protection, control and EMS/SCADA interface list, BOQ.
OEM document review, safety and fire-protection compliance review, test procedure review.
Send us the tender extract, single-line diagram, master deliverable list or the specific calculation you need. We will confirm scope, inputs and a realistic submission sequence before any work starts.