Greenwood Solutions × AusNet Services

The Safe
Envelope

A conditional connection framework that eliminates network risk while accelerating BESS deployment

A battery that cannot hurt your network. By design.

Built on AusNet's own SCADA data. 289 data points. 5-minute resolution. Your numbers prove it.

See the Data ↓Skip to Next Steps
The Problem

The Current Process
is Failing Everyone

Including AusNet. It was designed for solar farms — not controllable batteries.

0 mo
Average time to offer
0 days
Data pack wait time
0 rounds
Study revisions
0 sites
None at offer stage
Site ID
→
Data Pack
85 days
→
Study Commission
60 days
→
Study Submit
30 days
→
AusNet Review
45 days
→
Revision 1
45 days
→
Revision 2
45 days
→
Assessment
65 days
= 12–18 monthsbefore a single electron flows
The Solution

A Battery That Only Helps

Four operating windows. Zero network risk. Every hour accounted for.

CHARGE4 MWIDLE0 MWDISCHARGE5 MW0003060912151821SAFEENVELOPE
☀️
Solar Soak10:00–15:00
Charge 4 MW
Absorbs reverse flow from rooftop solar
⏸
Transition15:00–17:00
Idle 0 MW
No network impact during ramp
⚡
Evening Peak17:00–21:00
Discharge 5 MW
Reduces feeder loading during peak
🌙
Off-Peak21:00–10:00
Idle 0 MW
No network impact overnight
Real 5-Minute SCADA Data

MSD4 Mansfield — 289 Data Points

AusNet's own SCADA. Every 5 minutes. Real feeder MW, MVAR, and amps. The duck curve, laid bare.

Transformers
2× 10/13 MVA
Zone Substation
Conductor Rating
285A
256.5A at 90% rule
Fault Level
2,208 MVA
1,589 MVA N-1
System Strength
Very Strong
SCR 318–442
8–9 Dec 2024 — Summer low demand. Rooftop solar floods the feeder. Peak reverse flow of -2.5 MW at only 62A (22% of rating). The BESS absorbs it all.
-4 MW-3 MW-2 MW-1 MW0 MW1 MW2 MW3 MW4 MW5 MW15:0018:0021:0000:0003:0006:0009:0012:00SOLAR SOAK — BESS CHARGINGEVENING PEAK — BESS DISCHARGING⚠ REVERSE FLOW ZONE0 MWWithout BESS (SCADA)With Safe Envelope BESSSource: AusNet MSD4 SCADA — 5-minute intervals — 289 data points
💡 Importing 4 MW brings the feeder from -2.5 MW to +1.5 MW — completely eliminating reverse flow
From Your Own Data Pack

AusNet's Own Numbers

Every number below comes from the MSD4 data pack. We didn't model this — you measured it.

🔌
285A
256.5A at 90%
Conductor rating. Operational limit leaves massive headroom.
📊
213A
75% of rating
25% headroom BEFORE the BESS. Peak day barely uses the feeder.
⚠️
-2.5 MW
Growing to -6.1 MW
Reverse flow today. Growing to -6.1 MW by 2039. The BESS fixes this.
📉
20%
58 of 289 intervals
1 in 5 data points in reverse flow. And worsening every year.
💪
SCR 318–442
Very Strong
No system strength concerns. No interaction risks. Clean grid.
✅
0
Other projects
No interaction risk on MSD4. The BESS is the only game in town.

No line voltage regulators. No capacitor banks. REFCL enabled. Clean, simple network.

The Guarantee

Support-Only Limiter

One formula. Absolute protection. The BESS mathematically cannot create reverse flow.

Export = min(ExportCap, Demand − Buffer)
If demand < buffer → export = 0 → BESS locked to zero
High Demand
Demand: 8 MW
0.0 MW
BESS Export
Medium Demand
Demand: 3 MW
0.0 MW
BESS Export
Low Demand
Demand: 0.5 MW
0.0 MW
BESS Export
⛔ BLOCKED — Cannot create reverse flow

Safety Margin During Solar Soak

The data supports 7 MW. We proposed 4 MW. That's not aggressive — that's conservative.

Network Limit: 7 MW
Proposed: 4 MW
57%safety margin

We're not even close to the thermal limit.

Your Network, Your Control

AusNet Retains Everything

We're not asking you to give up control. We're giving you more.

📡
SCADA Runback
Full remote control from Day 1. Direct curtailment at any time.
🔌
Disconnect Rights
Unconditional right to disconnect at any time, for any reason.
⏱
Comms Fail-Safe
Communications loss = BESS trips to idle within 30 seconds.
🛡
Anti-Islanding
Full IEEE 1547 and AS/NZS 4777 compliant anti-islanding protection.
📋
SOP 11-16
Full compliance with all AusNet standard operating procedures.
👁
Conditional = Monitored
The conditional period IS the monitoring window. If anything looks wrong — kill it.
The Comparison

18 Months vs 5 Months

Same outcome. A fraction of the time. Studies still happen — just in parallel.

Current Process

Sequential. Slow. Designed for solar farms.

Data Pack
85d
Study Commission
60d
Study Submit
30d
AusNet Review
45d
Revision 1
45d
Revision 2
45d
Assessment
65d
375+ business days
~18 months to first electron

Safe Envelope

Parallel. Fast. Designed for controllable BESS.

Half Data Pack Screen
14d
Conditional Offer
30d
BESS Build
90d
⚡ BESS OPERATIONAL
Full studies continue in parallel during monitored operation
Full Studies (parallel)
120d
Conversion to Full
30d
~100 business days
~5 months to operational, studies continue
⏳ While You Wait…

During those 375 days, the MSD4 feeder sees -2.5 MW reverse flow 20% of the time. That's -2.5 MW × 20% of hours × 375 days of damage to the network while the process grinds on.

The Safe Envelope stops this on Day 1.

Network Benefits

Your Network Gets Stronger

The Safe Envelope doesn't just avoid harm — it actively improves network performance.

0.0 MW
Reverse Flow Absorbed
During solar soak — from -2.5 MW to +1.5 MW
0%
Peak Load Reduction
Evening discharge. 213A → ~170A headroom
0%
Thermal Headroom (Low Demand)
Only 62A of 285A used. Massive margin.

AusNet's Reverse Flow Forecast — With & Without BESS

Your own forecast data. The BESS absorbs up to 4 MW. After 2031, even the BESS can't catch it all — that's why you need it now.

-2.5 MW
2024
-3.2 MW
2025
-3.9 MW
2027
-4.5 MW
2029
-5 MW
2031
-5.2 MW
2033
-5.5 MW
2035
-5.8 MW
2037
-6.1 MW
2039
Absorbed by BESS (4 MW)
Remaining reverse flow
AusNet's own forecast — reverse flow worsening from -3.2 MW (2025) to -6.1 MW (2039)
Regulatory Alignment

Not Just Allowed —
Encouraged

Every relevant regulatory framework points in the same direction.

DAPR 2025
Explicitly lists MSD4 Mansfield for non-network solutions consideration
Chapter 5A (NER)
AusNet's own sub-5MW guidelines acknowledge negotiated connections
NSSL01T Tariff
Tariff structure already aligns with Safe Envelope operating windows — AusNet already thinks this way
AER
Australian Energy Regulator is pushing for faster, more efficient connection processes
2026-31 Regulatory Reset
Creates the perfect delivery window for non-network solutions
DEECA Victoria
State policy supports distributed energy storage as critical infrastructure
Portfolio Scale

10 Sites. One Framework.

MSD4 is the proof of concept. 6 sites already have data packs. The Safe Envelope scales to all of them.

MSD4 — Mansfield
285A | -2.5 MW reverse | SCR 318-442
Lead
CRE — Creswick
Data pack received
Active
LGA — Long Gully A
Data pack received
Active
MOE — Moe
Data pack received
Active
SMR — St Marys
Data pack received
Active
BN — Benalla
Data pack received
Active
WBN1 — Warburton
Data pack pending
Pipeline
TFD3 — Traralgon
Data pack pending
Pipeline
MLN2 — Maldon
Data pack pending
Pipeline
KVL4 — Keilor Valley
Data pack pending
Pipeline
Non-Exclusive Framework
Any proponent meeting the technical criteria can use the Safe Envelope pathway. AusNet gets a repeatable, scalable process instead of bespoke assessment every time.
Next Steps

Issue Conditional Offer
Within 30 Days

1
AusNet reviews Safe Envelope technical parameters
Week 1–2
2
Joint workshop: Greenwood + AusNet connections team
Week 3
3
Conditional Connection Agreement drafted
Week 3–4
4
MSD4 Mansfield: first conditional offer issued
Day 30
5
BESS construction commences
Day 31+

The Safe Envelope removes your risk.
It gives you control you don't currently have.
It solves problems you're already facing.

Let's build the pathway.

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