TERRAVOLT TerraVolt Energy × Kurrajong Renewables
EPC Proposal · RFP KR-EPC-2026-014

Boorndah Solar Farm & BESSEngineered to
hold the grid up

Full turnkey EPC delivery of 150 MWp solar + 80 MW / 160 MWh storage in the Central-West Orana REZ — grid-forming by design, on programme to Practical Completion.

Power delivered. Risk engineered out.
TERRAVOLT ENERGYBoorndah Solar + BESS · 2026
01Executive summary

A weak-grid project,
de-risked from day one

Boorndah sits in a system-strength constrained pocket of the REZ — the single biggest threat to schedule and registration. We lead with grid-forming BESS so the plant supports the network rather than leaning on it, and pair it with a string-inverter architecture that protects your availability guarantee. Programme certainty, guaranteed performance, and genuine regional participation complete the offer.

150 MWp
Solar, 120 MWac
80/160
MW / MWh grid-forming BESS
0.85
Design PR vs 0.83 required
Jun 28
Practical Completion, with float
BESS and collector substation
Grid-forming BESS · collector substation
TERRAVOLT ENERGYExecutive summary
02The project, as we understand it

Turnkey EPC,
lump-sum, on AS 4902

Plant
150 MWp solar (120 MWac) + 80 MW / 160 MWh BESS
Connection
TransGrid 132 kV switching station, Boorndah
Site
~380 ha, Central-West Orana REZ, near Wellington NSW
Generation
~320 GWh/yr P50 (Contractor yield to confirm)
Key risk
Weak network: system strength & GPS in a constrained REZ
Central-West Orana REZ landscape
Central-West Orana REZ · near Wellington, NSW
TERRAVOLT ENERGYThe project
03Four reasons we win this for you

What sets this bid apart

01

Grid-forming by design

GFM BESS inverters supply inertia-like and fault-current support, directly de-risking the do-no-harm and GPS obligations that sink projects in weak networks — potentially avoiding a separate synchronous condenser.

02

Programme certainty

A piling-led critical path, early module and BESS procurement, and parallel construction fronts hit Practical Completion by 30 June 2028 with float held in reserve.

03

Guaranteed performance

A technology selection chosen to beat every RFP guarantee — PR 0.85, 98.5%/97.5% availability — with headroom, backed by O&M-grade monitoring from day one.

04

Built with the regions

Australian steel, local civil and electrical subcontractors, and a genuine First Nations participation plan developed on Wiradjuri Country.

TERRAVOLT ENERGYWhy TerraVolt
04Technical solution · two options, one recommendation

String + grid-forming BESSRecommended

Option A · String + GFM BESSOption B · Central inverter
InvertersDecentralised stringCentral (skid)
Modules / trackersBifacial TOPCon ~590 Wp · single-axis backtrackingSame
BESS80/160 LFP, AC-coupled, grid-forming80/160 LFP, grid-following
System strengthGFM contributes strengthLikely needs synchronous condenser
AvailabilityHigher · granular failure domainsLower · large failure blocks
CapexModest premiumLowest unit cost
Recommendation — Option A. The grid-forming BESS is the differentiator: it materially lowers connection risk in a weak network and the string architecture protects the availability guarantee. The modest capex premium is repaid in reduced GPS risk, fewer curtailment events and availability headroom.
TERRAVOLT ENERGYTechnical solution
05Single-line concept

Generation to point of connection

PV Array
150 MWp · 120 MWac
33 kV radial feeders
Collector
Substation
33 / 132 kV
metering
Metering
NEM revenue
132 kV
TransGrid 132 kV
Switching station · POC
BESS
80 MW / 160 MWh · GFM · at 33 kV
Plant Controller (PPC) — coordinates P / Q, voltage & frequency response across PV + BESS to the negotiated access standards

Indicative concept. Final topology confirmed by the connection studies and negotiated GPS.

TERRAVOLT ENERGYSingle-line concept
06Indicative site layout

~380 ha, laid out around the constraints

PV Array — North
single-axis trackers
PV Array — South
backtracking
Overland
1-in-100 flow path
BESS
80/160 · LFP
Collector
Substation
Laydown & site compound
Site access & internal roads
PV array — single-axis trackers, split north/south of the overland flow path.
BESS compound adjacent to the collector substation for short AC runs.
Substation at the eastern edge, short tie to the TransGrid 132 kV station.
Overland flow path kept clear; civil design holds off-site flows unchanged.
TERRAVOLT ENERGYSite layout
07Grid compliance · the make-or-break

GPS to AEMO &
TransGrid, staged

Full engineering to NER 5.3.4A / 5.3.4 and negotiated Generator Performance Standards under NER Schedule 5.2 (S5.2.5.1–14). PSCAD and PSS/E models, with AEMO and TransGrid engaged from week one.

R1 · design
Connection studies & negotiated access standards
R2 · validation
Model validation & commissioning hold-point tests
R3 · final
Final compliance & hold-point release to full output
Do-no-harm
GFM BESS supports system strength; residual remediation carried as a transparent provisional sum
Plant control room and commissioning
Commissioning · model validation · SCADA
TERRAVOLT ENERGYGrid compliance
08Performance · beating the guarantees

Designed with headroom, not to the line

Guarantee (RFP §5)RFP minimumOur design target
Performance ratio (year 1, temp-corrected)≥ 0.830.85
Module degradation≤ 0.45%/yr0.40%/yr (TOPCon)
BESS round-trip efficiency (BOL)≥ 86%87.5%
BESS usable energy160 MWh BOL160 MWh + 10-yr augmentation plan
Availability — solar / BESS98% / 97%98.5% / 97.5%

String architecture, comprehensive spares, and our own monitoring underwrite the availability margin.

TERRAVOLT ENERGYPerformance
09Delivery methodology & programme

Piling-led critical path to PC

Q3 26
Q4 26
Q1 27
Q2 27
Q3 27
Q4 27
Q1 28
Q2 28
Q3 28
Detailed design / GPS (R1)
Procurement — modules, inverters, BESS
Civil & piling
Electrical & array install
BESS & substation
Commissioning (R2) & energisation

NTP Sep 26 · R1 Q1 27 · Mechanical completion Q4 27 · Back-energisation Q1 28 · ◆ Practical Completion 30 Jun 28 · R3 Q3 28

TERRAVOLT ENERGYProgramme
10HSE, quality & environment

Everyone home safe, every day

Health & safety
  • WHS Management Plan to the NSW WHS Act 2011 and ISO 45001 principles
  • Working-at-heights & electrical safety controls with defined SWMS
  • BESS fire / thermal-runaway response with Fire & Rescue NSW and a UL 9540A HMA
Quality
  • ISO 9001 ITP-based quality plan
  • Defined hold & witness points through to commissioning
  • Full factory acceptance and site test records, handed over as the QA dossier
Environment
  • CEMP: erosion & sediment, biodiversity, dust, noise
  • Civil design holds the 1-in-100 overland flow unchanged
  • Bushfire asset protection to AS 3959 principles
TERRAVOLT ENERGYHSE, quality & environment
11Organisation & experience

A team that has done this before

Project Directorsingle point of accountability
Engineering Managergrid / GPS lead
Construction Managersite delivery
Commissioning ManagerR1–R3 compliance
HSE ManagerWHS & environment
Quality ManagerITP & handover dossier
Comparable Australian delivery
Riverina Solar + BESS
200 MWp + 100/200 MWh · NSW · grid-forming · completed 2025
Darling Downs Solar Farm
180 MWp · QLD · single-axis · completed 2024
Goyder Grid-Forming BESS
120/240 MWh · SA · system-strength service · completed 2025
TERRAVOLT ENERGYTeam & experience
12Commercial

Lump-sum, turnkey, transparent

Priced schedule, by area (indicative split)
PV array & trackers38%
BESS24%
HV & connection15%
Civil & BoP14%
Engineering & commissioning9%
Contract
Amended AS 4902 · lump-sum turnkey
Security
Bank guarantees 10% (5% award + 5% retention/PC)
LDs
Delay & performance (PR / availability), capped
Insurances
Works · Public & Products $20m · PI $10m
Grid residual
Transparent provisional sum, not a hidden risk
TERRAVOLT ENERGYCommercial
13
Criterion 06
Local content
Built in the regions, with the regions

Value that stays
on Country

Australian-made steel for piles and structures where available, local civil and electrical subcontractors, and a First Nations participation plan developed with the local Aboriginal Land Council on Wiradjuri Country — employment, training and supply opportunities, not a box-tick.

TERRAVOLT ENERGYLocal content & First Nations
Why TerraVolt Energy

We hold the
grid up — and the programme

GFM
Grid-forming BESS, by design
0.85
Design PR, above the guarantee
3
Comparable AU solar + BESS delivered

Boorndah's hardest problem is the weak grid. Our solution is built around solving exactly that — with the programme certainty, guaranteed performance and regional commitment to match. We would welcome the shortlist interview to walk you through the detail.

TerraVolt Energy  ·  tenders@terravolt.com.au  ·  RFP KR-EPC-2026-014
TERRAVOLT ENERGYThank you