Short answer: in 2026 about 95% of new Australian home solar storage is lithium iron phosphate (LFP) battery — Tesla Powerwall 3, Sungrow, BYD, sigenergy. At grid scale it's the same chemistry in big modular packs (Tesla Megapack, BYD MC Cube). Beyond batteries, Australia uses pumped hydro (Snowy 2.0, Borumba), and a small amount of thermal and hydrogen storage at industrial sites. Compressed-air, flywheels, and gravity storage exist mostly in pilots.

This is the 2026 picture — not the textbook version from 2018. The story has narrowed: lithium-ion (specifically LFP) won the household and 4-hour grid market on price and safety, and the policy focus is now on getting more of it built, not on choosing between chemistries.

The four ways solar energy gets stored in Australia today

Method	Where it's used	Typical duration	2026 status
Lithium-ion battery (LFP, NMC)	Homes, businesses, grid BESS	2–6 hours	Dominant — 95%+ new installs
Pumped hydro	Grid, multi-day storage	6–168 hours	Snowy 2.0 (~2028), Borumba (in development)
Thermal (molten salt, hot rock, hot water tank)	Industrial heat, hot water	4–24 hours	Niche / pilot
Green hydrogen	Industrial / export, seasonal	Days–months	Emerging, mostly export-focused

You'll see articles list compressed-air, flywheels, gravity (Energy Vault), and supercapacitors. They exist in pilots; none of them are buying meaningful market share in Australia in 2026.

1. Lithium-ion batteries — what's actually in a 2026 home install

LFP has all but replaced NMC

Two lithium-ion chemistries have battled for residential: NMC (nickel-manganese-cobalt, what older Powerwall 2s used) and LFP (lithium iron phosphate). In 2026 LFP has won almost completely in Australia:

Property	LFP (2026 standard)	NMC (legacy)
Cycle life	6,000–10,000	3,000–4,000
Thermal stability	Excellent — no thermal runaway under normal abuse	Lower — managed via BMS
Energy density	Lower (~10–15% bigger box)	Higher
Cost per kWh (cell)	~AU$110–140	~AU$160–190
Materials	Iron, phosphate (abundant)	Nickel + cobalt (constrained)
Typical AU products	Tesla Powerwall 3, Sungrow SBR/SBH, BYD HVM, Sigenergy, GoodWe Lynx	Tesla Powerwall 2 (discontinued for AU)

For a Brisbane household, that means buying a battery in 2026 effectively means buying LFP. The lower energy density isn't a problem because residential boxes hang on a wall — the extra ~15cm rarely matters. See battery cost in Brisbane 2026 for installed pricing.

How a home battery actually stores solar

Excess DC from the panels (or AC from a hybrid inverter) charges the battery during the day. The battery cells store the energy chemically (Li⁺ ions move between cathode and anode). At night the process reverses, the battery discharges DC, the inverter converts to AC, and your house consumes it. Round-trip efficiency is around 90–94% for modern LFP — you lose ~6–10% of every kWh in the conversion.

A typical Brisbane 10–13.5 kWh battery cycles roughly 300–340 times per year. Over 10 years that's 3,000–3,400 cycles — well within LFP's 6,000+ cycle warranty.

2. Grid-scale batteries — the same chemistry, much bigger

The exact same LFP chemistry now dominates utility BESS in Australia. Tesla Megapacks, BYD MC Cubes, Sungrow ST and CATL EnerC are all LFP. Typical project: 4-hour duration (e.g. 100 MW / 400 MWh), siting next to a solar farm or a constraint on the transmission network.

Hornsdale Power Reserve (SA, Neoen/Tesla) — original 100 MW / 129 MWh, expanded to 150 MW / 193.5 MWh. The proof-of-concept that started everything.
Waratah Super Battery (NSW, Akaysha) — 850 MW / 1,680 MWh, operating in stages from 2025. Currently the largest BESS in the southern hemisphere.
Western Downs BESS (QLD, Neoen) — 270 MW / 540 MWh under construction, co-located with the 460 MW Western Downs solar farm.
Eraring BESS (NSW, Origin) — 460 MW / 1,840 MWh — repurposing a retiring coal plant's grid connection.

4-hour storage is the current sweet spot — long enough to cover the evening peak (5–9pm), short enough that LFP cell costs make the project bankable. For 8+ hour storage the economics tip toward pumped hydro. See our biggest Australian solar projects for the generation side.

3. Pumped hydro — the only proven long-duration option at scale

Use cheap midday solar electricity to pump water uphill into a reservoir. At night, release it through turbines to make electricity again. ~75–80% round-trip efficient, but lifetimes of 80–100+ years and storage durations of days, not hours.

Snowy 2.0 (NSW, Snowy Hydro) — 2,200 MW, 350 GWh of storage. First-power targeted late 2027 / 2028 after multiple delays. When complete, the largest pumped hydro project in the southern hemisphere.
Borumba Pumped Hydro (QLD, Queensland Hydro) — 2,000 MW, 24-hour duration (~48 GWh). Construction approval secured, FID in 2026.
Kidston (QLD, Genex) — 250 MW operational from 2025; converted gold mine pit.
Pioneer-Burdekin (QLD) — proposed 5 GW Battery of the Nation scale project, currently shelved pending economics review.

Pumped hydro is the unsexy workhorse of Australia's energy transition. Snowy 2.0 alone will provide more storage than every battery in Australia combined, several times over.

4. Thermal storage — modest but real

Three forms in practical Australian use:

Solar hot water tanks — the simplest, most distributed thermal storage in Australia. 1.1M+ systems. Store solar energy as 60–80°C water for evening use. See solar hot water cost guide.
1414 Degrees / SiBox (SA) — silicon thermal energy storage, pilot scale, targeting industrial heat.
MGA Thermal (NSW) — Miscibility Gap Alloy blocks (essentially "hot bricks") for industrial process heat. First commercial project commissioning 2026.

Thermal storage's pitch is decoupling: capture cheap solar electricity, store as heat, deliver back as heat to a process — bypassing the round-trip-back-to-electricity penalty that kills batteries for industrial heat duty.

5. Green hydrogen — the long-duration / export bet

Solar electricity runs an electrolyser; the hydrogen is stored as a gas (or liquid, or converted to ammonia) and reconverted to electricity in a fuel cell or burned as fuel. Round-trip efficiency is poor (~30–40% if you go back to electricity), but it's storable for months, exportable, and usable in industrial processes that can't electrify directly.

Gladstone Hydrogen Hub (QLD), Pilbara Hydrogen Hub (WA), Port Kembla (NSW), Bell Bay (TAS) — all in FID stage.
SunCable AAPowerLink bypasses hydrogen and exports the electricity directly via HVDC subsea cable. See our biggest projects guide.

Realistic 2026 take: hydrogen is for steel, ammonia, refining and export — not for storing your household's electricity.

Vehicle-to-home (V2H) — the next consumer storage

The biggest emerging "battery" in any household is the EV in the driveway. A Kia EV9 carries 100 kWh — seven times a Powerwall. V2H/V2G hardware finally arrived in Australia in 2025–2026:

Wallbox Quasar 2, Sigenergy SigenStor with EV port, Nissan Leaf bidirectional via specific chargers.
Approved for AS/NZS 4777.2 grid connection in QLD and NSW (with caveats).
Costs ~$8,000–$12,000 installed for a bidirectional charger today; expected to halve over 2026–2028.

Most Brisbane households who buy an EV after 2027 will end up using it as their primary home battery — and the standalone wall battery as a smaller backup buffer.

What this means for a Brisbane household in 2026

If you want home storage now: an LFP battery (10–16 kWh usable) is the only sensible choice. See 2026 Brisbane battery pricing.
The federal Cheaper Home Batteries Program pays roughly $330/kWh; see rebate breakdown.
If you're 2–3 years from buying an EV, consider a smaller battery now (10 kWh) and budget for a bidirectional charger later.
Thermal storage isn't a "system you buy" — it's choosing a heat-pump or solar hot water tank instead of gas.
Grid-scale storage doesn't help you directly today, but it's why daytime FiTs will keep falling and evening prices keep rising — sharpening your case for self-consumption. See best energy provider.

Frequently Asked Questions

What type of battery do home solar systems use in 2026?

Lithium iron phosphate (LFP). Around 95% of new Australian residential installs in 2026 are LFP — Tesla Powerwall 3, Sungrow SBR/SBH, BYD HVM/HVL, Sigenergy, GoodWe Lynx. NMC chemistry has largely exited residential due to thermal-runaway risk.

How long does stored solar energy last in a battery?

An LFP battery loses around 1–2% per month to self-discharge — practically negligible for daily cycling. The cells last 6,000–10,000 cycles, or 15–20+ years of typical residential use.

Can solar be stored without batteries?

Yes — as heat (hot water tanks, thermal blocks), as gravitational potential (pumped hydro), as compressed air, as hydrogen, or as kinetic energy (flywheels). At residential scale, the practical non-battery option is hot water — store solar electricity as 60–80°C water in a heat-pump tank for evening use.

What's the biggest battery storage project in Australia?

The Waratah Super Battery in NSW (Akaysha Energy) at 850 MW / 1,680 MWh, operating in stages from 2025. By energy capacity, Origin's Eraring BESS at 1,840 MWh will surpass it when complete.

How does pumped hydro store solar energy?

Cheap midday solar electricity pumps water from a lower reservoir to an upper one. At night, water flows back down through turbines, regenerating electricity at ~75–80% round-trip efficiency. Snowy 2.0 (2,200 MW / 350 GWh) is the largest under construction.

Is hydrogen used to store solar energy in Australia?

Not yet at meaningful scale for electricity-back-to-electricity. Green hydrogen projects in Gladstone, the Pilbara, Port Kembla, and Bell Bay are being built primarily for industrial use and export — not for grid storage. Round-trip efficiency for hydrogen-to-electricity is only 30–40%.

What size battery does a typical Brisbane home need?

10–16 kWh usable for most 6.6–10 kW solar systems. Covers the evening peak (5–9pm) plus overnight base load with ~70% of solar self-consumed. Bigger only makes sense if you're charging an EV from solar or running heavy evening loads. See battery cost guide.

Is sodium-ion a real alternative yet?

Coming, not arrived. CATL and BYD ship sodium-ion cells in China for grid use; first AU residential products expected late 2027. Sodium-ion will compete with LFP on cost (no lithium) but at lower energy density. Unless you have a specific reason to wait, LFP today is the right answer.

Can my EV act as a home battery?

Yes, with a bidirectional (V2H/V2G) charger and an EV that supports it. Hardware finally hit Australia in 2025–2026 (Wallbox Quasar 2, Sigenergy, Nissan Leaf via specific chargers). Installed cost is currently $8,000–$12,000; expected to drop sharply through 2027.

Why don't we just store all solar in batteries?

Cost and duration. Lithium batteries are economic up to about 4 hours of storage; for longer (a wet week, a seasonal lull) pumped hydro and hydrogen are cheaper per stored kWh. The 2026 grid mix uses batteries for the evening peak and pumped hydro for deeper firming.

How Is Solar Energy Stored? (Australia 2026 Guide)