Haohan / MC Cube grid storage by BYD: status and timeline

Haohan / MC Cube grid storage

Store solar and wind power in ever bigger, cheaper battery blocks so grids can run on renewables around the clock. Bigger cells and units mean fewer parts, less land and lower cost per kilowatt-hour stored.

DeployStage 4 of 5

Haohan won 13.7 GWh of orders in Abu Dhabi and Poland in 2026; BYD storage is in 110+ countries.

Updated 9 Jul 2026Checked 11 Oct0 updates this week

Milestones

Next · Siedlce (Poland) construction starts

BYD energy storage business starts2008Complete.
12.5 GWh MC Cube-T deal with Saudi Electricity, 5 sites17 Feb 2025Complete.
Haohan launched: 14.5 MWh unit, 2,710 Ah Blade cell18 Sep 2025Complete.
99.8 MW / 288.6 MWh Hungary site online on MC CubeJun 2026Complete.
Haohan picked for Poland's largest battery, 600 MW / 2.4 GWh1 Jul 2026Complete.
11.275 GWh Haohan deal for Abu Dhabi round-the-clock project9 Jul 2026Complete.
Siedlce (Poland) construction startsTarget Q3 2026Current milestone.
Siedlce in commercial operationTarget Q4 2027Not yet reached.

Most important updates

Upcoming

Q3 2026Siedlce (Poland) construction starts (next)
Q4 2027Siedlce in commercial operation

Current obstacles

Claims not yet proven at scaleFailure-rate, cost and 10,000-cycle figures are BYD's own; the first GWh-scale Haohan sites are only now being built.
Bigger cells, bigger failuresOne 2,710 Ah cell stores far more energy than a standard cell, so if it overheats more heat is released and containment must scale with it.

Physics limits

LFP trades density for safety and lifeLithium iron phosphate is cheap, long-lived and hard to ignite, but stores less energy per kilogram than nickel chemistries; sites need more cells and land per MWh.
Batteries cover hours, not seasonsLithium storage pays off when it cycles daily over a few hours; holding energy for weeks would need far more cells per watt delivered, which is too costly.

How it works

4 parts

Cell

One huge Blade cell

A long, flat 2,710 Ah lithium iron phosphate cell, about three times a normal storage cell, so a site needs far fewer cells, joints and sensors.

Packing

Cells straight into the box

Cells go into the enclosure without separate modules: 52% of Haohan's volume is cells, against about a third in the older MC Cube-T.

Grid-forming

Inverter that steadies the grid

The GC Flux inverter (2.5–10 MW) can set voltage and frequency itself, reacting in under 100 ms and giving inertia like a spinning generator.

Control

One brain for a whole site

BYD's GC Master energy management software tracks tens of millions of data points and can run a single site of more than 15 GWh.

Spec sheet

Spec	Haohan / MC Cube grid storage
Haohan unit capacity (minimum)	14.5 MWh^R (reported)
Per 20-ft container	10 MWh^R (reported)
Blade storage cell	2,710 Ah^R (reported)
Cell share of system volume	52.1%^R (reported)
Volumetric energy density	233 kWh/m³^R (reported)
Cycle life (claimed)	Over 10,000 cycles^R (reported)
Operating temperature	-30 °C to 55 °C^R (reported)
GC Flux inverter peak efficiency	99.35%^R (reported)
Storage cost cut (BYD claim)	21.7% lower LCOS^R (reported)

^R reported by the company

Update log

4 updates

About BYD

The team behind Haohan / MC Cube grid storage

BYD

EVs, plug-in hybrids, Blade Battery, chips

Shenzhen-based BYD is the world's biggest maker of electric and plug-in hybrid cars and makes its own batteries, power electronics and chips. It sold about 4.6 million vehicles in 2025, passing Tesla in pure EV sales.

Makes almost everything itself, from LFP battery cells to chips.
Super e-Platform (2025) supports charging at up to 1,000 kW.
Expanding abroad with plants in Hungary, Turkey, Brazil and Thailand.

byd.com (opens byd.com)Company profile →

Founded: 199531 yrs
Headquarters: China
Status: Public
Listed: 1211 (opens google.com)HKEX
Valuation: $115Bmarket capSep 2026
Staff: ~911,900Jun 2026
Works in: VehiclesElectric carsEnergy
Coverage: 4 programs · 17 updateslatest 2d agochecked 11 Oct
People: Wang Chuanfu (opens en.wikipedia.org)Founder, Chairman and President

Spec

Haohan / MC Cube grid storage

Haohan unit capacity (minimum)

14.5 MWh^R (reported)

Per 20-ft container

10 MWh^R (reported)

Blade storage cell

2,710 Ah^R (reported)

Cell share of system volume

52.1%^R (reported)

Volumetric energy density

233 kWh/m³^R (reported)

Cycle life (claimed)

Over 10,000 cycles^R (reported)

Operating temperature

-30 °C to 55 °C^R (reported)

GC Flux inverter peak efficiency

99.35%^R (reported)

Storage cost cut (BYD claim)

21.7% lower LCOS^R (reported)

Haohan / MC Cube grid storage

Milestones

Most important updates

Upcoming

Current obstacles

Physics limits

How it works

One huge Blade cell

Cells straight into the box

Inverter that steadies the grid

One brain for a whole site

Spec sheet

Update log

Thu 9 Jul

Wed 1 Jul

Thu 18 Sep 2025

Mon 17 Feb 2025

About BYD

Current obstacles

Physics limits

How it works

One huge Blade cell

Cells straight into the box

Inverter that steadies the grid

One brain for a whole site

Spec sheet

Update log

Thu 9 Jul

Wed 1 Jul

Thu 18 Sep 2025

Mon 17 Feb 2025

About BYD