Understanding DER Tiers: What Tier 0, 1, and 2 Mean for Your Battery

From May 2026, every new solar or battery installation in WA gets classified into a "tier." This isn't just bureaucratic labelling - the tier you're in directly affects how much you can export, what rebates you can access, and how much money you can earn from your system.

Here's what each tier actually means, in plain English.

Why Tiers Exist

Western Australia has a problem (a good problem, but still a problem): more rooftop solar than almost anywhere else in the world. On sunny days, all that solar floods the grid faster than demand can absorb it.

The old approach was blunt - cap everyone at 5kW export and manually curtail systems during emergencies. The new tier system creates a smarter framework where Synergy can communicate with systems in real-time, adjusting exports based on what the grid actually needs.

Think of it like this: the old system was everyone driving the same speed limit regardless of traffic. The new system adjusts speed limits dynamically based on actual conditions.

Tier 0: The Offline Option

Export Limit: 1.5kW (hardware-set)

Internet Required: No

Synergy Control: None

Programs Available: None

Tier 0 exists for properties that genuinely can't maintain reliable internet. Maybe you're on a rural property with satellite-only connectivity, or you simply don't have internet infrastructure.

What Tier 0 Gets You

• A fixed 1.5kW export limit set at the inverter level
• No dependency on internet connectivity
• No DEBS feed-in tariffs (beyond the base rate)
• No VPP participation
• No WA Battery Scheme rebate or loan access

Who Tier 0 Is For

Honestly? Almost nobody should be choosing Tier 0. It's there as a fallback for properties where reliable internet genuinely isn't possible.

If you have any kind of stable internet connection (NBN, fixed wireless, even decent 4G), you're better off in Tier 1 or 2.

Tier 1: Standard Solar

Export Limit: 1.5kW (remotely managed)

Internet Required: Yes (95% uptime)

Synergy Control: Emergency Solar Management (ESM)

Programs Available: DEBS feed-in tariffs

Tier 1 is the standard configuration for solar-only systems. Your export limit is the same as Tier 0 (1.5kW), but it's managed remotely rather than set in hardware.

What This Means Practically

You need reliable internet - Synergy specifies 95% uptime. Your system connects to Synergy's utility server and responds to Emergency Solar Management signals.

If the grid gets stressed on a hot summer afternoon, Synergy can remotely reduce or stop your exports. You don't get paid extra for this - it's a condition of being connected.

The 1.5kW Limit

This might seem restrictive if you have a larger solar array. And it is. But here's the thing: for systems without batteries, most of your solar value comes from self-consumption anyway, not exports.

The export limit mainly affects midday production when you're generating more than you're using. Yes, you'll curtail some potential exports, but the economics of solar have always favoured using power directly over selling it back.

DEBS Access

Tier 1 systems can participate in DEBS (Distributed Energy Buyback Scheme), earning:

• 10¢/kWh during peak hours (3pm-9pm)
• 2¢/kWh during off-peak hours

For most solar-only systems, Tier 1 is perfectly adequate.

Tier 2: Battery Integration

Export Limit: Dynamic (can exceed 5kW)

Internet Required: Yes (95% uptime)

Synergy Control: Full VPP control + ESM

Programs Available: DEBS + Battery Rewards + Solar Export Rewards + WA Rebates

Tier 2 is where battery owners want to be. This is where the real benefits unlock.

What Makes Tier 2 Different

Dynamic Export Limits: Instead of a fixed cap, your export limit adjusts based on grid conditions. When the grid has capacity, you can export significantly more than the old 5kW limit. When it's stressed, the limit drops.

VPP Participation: Synergy can call on your battery during peak demand periods, discharging it to help the grid. You earn 70¢/kWh during these "activation events" - roughly $130-180/year for a typical battery.

High Granularity Telemetry: Synergy gets detailed data on your system's performance. This enables smarter grid management across thousands of connected batteries.

Tier 2 Requirements

Getting to Tier 2 requires:

1. SSL-compliant equipment - Your inverter and battery must be on Synergy's Supported Solutions List
2. Communication capability - Either built into your hybrid inverter or via a gateway device
3. 95% internet uptime - Same as Tier 1
4. Synergy customer status - Typically on A1 Midday Saver tariff

The Real Benefit: Rebate Access

Here's the key thing: from May 2026, Tier 2 (VPP participation) is required to access:

• WA Battery Scheme rebate ($130/kWh up to $1,300, 10kWh max eligible)
• Up to $10,000 interest-free loan (household income under $210,000)

So if you're buying a battery and want the rebate, you're registering for Tier 2 regardless.

What Happens When Internet Drops?

This is a common concern, so let's address it directly.

If your system loses internet connectivity:

• All tiers revert to 1.5kW export limit
• DEBS customers (who normally get 5kW) drop to 1.5kW
• VPP events can't be called on your battery

The system doesn't stop working - you keep generating solar and using battery power normally. You just can't export much until connectivity is restored.

For most homes with NBN or stable internet, this is rarely an issue. If you have genuinely unreliable internet, factor this into your expectations around export earnings.

Which Tier Should You Choose?

For solar-only installations: Tier 1 is typically sufficient. You get DEBS access without needing SSL-specific equipment.

For battery installations: Tier 2 is essential. You need it for the rebate, and you want it for VPP earnings and dynamic export limits.

Only choose Tier 0 if: You genuinely cannot maintain stable internet. This is rare in metro Perth and most regional SWIS areas.

The Registration Process

Here's the good news: you don't have to navigate tier registration yourself.

Your installer handles this during commissioning:

1. They verify your equipment is SSL-compliant
2. They register your system with Synergy
3. They complete commissioning tests with Synergy's utility server
4. Your tier is assigned based on your equipment and preferences

For battery installations, you're auto-enrolled in VPP (Battery Rewards) unless you specifically opt out.

Common Questions

Can I upgrade tiers later?

Yes, if you add a battery to an existing solar system or upgrade to SSL-compliant equipment, you can move to a higher tier. However, this typically requires new equipment - you can't just "software upgrade" a non-compliant system.

Does my tier affect daily operation?

Day-to-day, you won't notice much difference. Your system generates solar, charges your battery, and exports excess as normal. The tier mainly affects:

• How much you can export (1.5kW vs dynamic)
• Whether Synergy can call VPP events
• Which programs and rebates you can access

What if I just want to ignore all this?

Systems installed before 1 May 2026 are grandfathered. They keep their original arrangement. New installations must comply with the current framework, and if you want the rebate, VPP participation is required.

Summary

| Tier | Export | Internet | VPP | Rebate | Best For |

|------|--------|----------|-----|--------|----------|

| 0 | 1.5kW fixed | No | No | No | Rural without internet |

| 1 | 1.5kW managed | Yes | No | No | Solar-only systems |

| 2 | Dynamic | Yes | Yes | Yes | Battery systems |

For most Perth homeowners buying a battery in 2026, the path is clear: Tier 2 with SSL-compliant equipment. The rebate alone makes this the sensible choice, and the VPP earnings are a bonus.

The tier system adds complexity, but it also enables a smarter grid where batteries can actually contribute during stress periods rather than just sitting idle. That's ultimately better for everyone.

Check SSL-Compatible Equipment →

Calculate Your VPP Earnings →

WA Battery Scheme Details →