# Haohan / MC Cube grid storage by BYD

Canonical page: https://technooptimist.io/energy/byd-grid-storage
Frontier: [Energy](https://technooptimist.io/energy.md) · Field: Grid batteries · Company: [BYD](https://technooptimist.io/companies/byd.md)
Stage: Deploy (4 of 5: Research → Proto → Pilot → Deploy → Scaling)
Updated: last update 2026-07-09, facts checked 2026-10-11
Goal: 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.
Status: Haohan won 13.7 GWh of orders in Abu Dhabi and Poland in 2026; BYD storage is in 110+ countries.
Next milestone: Siedlce (Poland) construction starts, target Q3 2026

## Milestones

| Status | Milestone | Date | Slip |
| --- | --- | --- | --- |
| Done | BYD energy storage business starts | 2008 |   |
| Done | 12.5 GWh MC Cube-T deal with Saudi Electricity, 5 sites | 17 Feb 2025 |   |
| Done | Haohan launched: 14.5 MWh unit, 2,710 Ah Blade cell | 18 Sep 2025 |   |
| Done | 99.8 MW / 288.6 MWh Hungary site online on MC Cube | Jun 2026 |   |
| Done | Haohan picked for Poland's largest battery, 600 MW / 2.4 GWh | 1 Jul 2026 |   |
| Done | 11.275 GWh Haohan deal for Abu Dhabi round-the-clock project | 9 Jul 2026 |   |
| Current | Siedlce (Poland) construction starts | Q3 2026 |   |
| Planned | Siedlce in commercial operation | Q4 2027 |   |

## Upcoming events

- **Q3 2026**: Siedlce (Poland) construction starts
- **Q4 2027**: Siedlce in commercial operation

## Most important updates

- **9 Jul 2026**: BYD to supply 11.275 GWh of Haohan storage to Masdar's round-the-clock solar project in Abu Dhabi. BYD signed an 11.275 GWh agreement with Masdar to supply Haohan batteries for the Round The Clock project in Abu Dhabi, developed with utility EWEC and billed as the first gigawatt-scale renewable plant meant to deliver steady power day… ([our story](https://technooptimist.io/stories/byd-to-supply-11-275-gwh-of-haohan-storage-to-masdar-s-round-the-clock-5e052ebb.md) · [original source](https://cnevpost.com/2026/07/10/byd-11-275-gwh-storage-deal-abu-dhabi-project/))
- **1 Jul 2026**: Greenvolt picks BYD Haohan for Poland's largest battery, a 600 MW / 2.4 GWh plant at Siedlce. Greenvolt Power signed a supply deal with BYD Energy Storage for Haohan systems at Siedlce, a 600 MW / 2.4 GWh plant that will be Poland's largest battery and one of Europe's largest. ([our story](https://technooptimist.io/stories/greenvolt-picks-byd-haohan-for-poland-s-largest-battery-a-600-mw-2-4-a97a5788.md) · [original source](https://www.ess-news.com/2026/07/01/greenvolt-byd-energy-sign-supply-deal-for-600-mw-bess-in-poland/))
- **18 Sep 2025**: BYD unveils Haohan, a 14.5 MWh battery storage unit built on a 2,710 Ah Blade cell. At an expo in Shenzhen BYD launched Haohan, a DC battery block of at least 14.5 MWh, against an industry norm of 6–7 MWh per unit. ([our story](https://technooptimist.io/stories/byd-unveils-haohan-a-14-5-mwh-battery-storage-unit-built-on-a-2-710-ah-097e3aa0.md) · [original source](https://www.ess-news.com/2025/09/19/byd-unveils-worlds-largest-14-5-mwh-dc-energy-storage-system/))
- **17 Feb 2025**: BYD signs 12.5 GWh of grid battery contracts with Saudi Electricity, the largest grid-scale storage deal to date. BYD Energy Storage signed contracts with Saudi Electricity Company for 12.5 GWh of batteries across five projects, after reports in January named it the winner. ([our story](https://technooptimist.io/stories/byd-signs-12-5-gwh-of-grid-battery-contracts-with-saudi-electricity-the-e0f846bb.md) · [original source](https://www.pv-magazine.com/2025/02/17/byd-to-supply-12-5-gwh-of-battery-storage-in-saudi-arabia/))

## Current obstacles

- **Claims not yet proven at scale**: Failure-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 failures**: One 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 life**: Lithium 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 seasons**: Lithium 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

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

Provenance: reported = stated by the company; estimated = our estimate; sample = a sample figure.

## About BYD

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.

- Founded: 1995
- Headquarters: CN
- Status: public
- Listing: 1211 (HKEX)
- Valuation: $115B (market cap, 2026-09)
- Staff: ~911,900
- Website: https://www.byd.com
- People: Wang Chuanfu (Founder, Chairman and President)

Company page: https://technooptimist.io/companies/byd.md

## Related programs

More from BYD:

- [Super e-Platform](https://technooptimist.io/vehicles/super-e-platform.md) (Deploy)
- [DiPilot (God's Eye)](https://technooptimist.io/vehicles/dipilot.md) (Scaling)
- [Blade Battery 2.0](https://technooptimist.io/energy/blade-battery-2.md) (Deploy)

Everything in Energy: https://technooptimist.io/energy.md

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