BloombergNEF Tier 1
Since 2024
RelyEZ has been on BloombergNEF's Tier 1 list since 2024, alongside CATL, BYD, Tesla, Sungrow and LG Energy Solution. A place held over time, reviewed every quarter.
Becske, Hungary · 55 MW / 110 MWh
GridUltra containers in service, connected to the grid.
Our technology partner
RelyEZ, the manufacturer behind our batteries.
A specialist in assembling storage systems — it is its only trade. Latest-generation LFP cells, liquid or immersion cooling, protections, conversion and control: RelyEZ integrates the whole in the factory, then stands behind it.
2019
Founded, in Shenzhen
+10 GWh
Delivered worldwide since founding
3 plants
Zhenjiang, Jiaxing and Yao'an — more than 10 GWh a year of capacity
+100
Customers worldwide
What can be checked
Four proofs.
Warranty reinsured by Munich Re
Up to 15 years
Few manufacturers get a reinsurer of this rank to stand behind their warranty. RelyEZ's is carried by a policy reinsured by Munich Re, available at purchase as an option.
Standards and certifications
21 standards
System safety, cells, conversion, grid connection, electromagnetic compatibility, transport, management: the products are declared compliant with twenty-one international standards, with test reports and certificates to back it up.
Rated financial strength
BBB
Rating given in PV Tech's Battery StorageTech report, which assesses the financial and technical strength of storage suppliers from a lender's point of view.
The 21 standards in detail
Depending on the model — the exact list is on each product's declaration of conformity.
- System safetyUL 9540 · UL 9540A · UL 1973 · UL 840
- Conversion and power electronicsUL 1741 · IEC 62477-1
- Cells and componentsIEC 62619 · IEC 63056 · IEC 60730-1
- Grid connectionEN 50549-1 · IEEE 1547 · IEEE 1547.1
- Electromagnetic compatibilityIEC 61000-6-2 · IEC 61000-6-4
- Lithium battery transportUN 38.3 · UN 3480 · UN 3536
- Management systemsISO 9001 · ISO 14001 · ISO 45001 · ISO 50001
The company
A company in hypergrowth.
RelyEZ Energy Storage Technology was founded in 2019 in Shenzhen. Six years on: more than 10 GWh delivered, three plants — Zhenjiang, Jiaxing, Yao'an — sized for more than 10 GWh a year, around ten subsidiaries including one in Germany and one in Cyprus to cover Europe, and a stock-market listing under way.
One product, one ambition. The company invests only in industrial energy storage: it does not make the cell, it assembles — cells, cooling, protections, conversion and control into a system built to last twenty years. Its signature states the target: Create Tier-1 BESS Assets. To be first on that ground, and nothing else.
2019
Founded. First 80 MWh project delivered in China.
2020
40 MW / 193 MWh solar-plus-storage plant in Tibet, one of the highest-altitude in the world.
2021
Jiangsu plant launched. More than 2 GWh delivered in the year. National award for best system integrator.
2022
Yunnan plants built. 2.8 GWh delivered in the year.
2023
Second worldwide for DC-side deliveries. Entered S&P Global's Top 10 suppliers.
2024
Entered BloombergNEF's Tier 1 list.
2025
500 MW / 2 GWh project in Inner Mongolia and four Yunnan plants totalling 1.5 GWh. First contracts in the United States, Hungary, Japan, Chile and Poland. Stock-market listing under way.
2026
Still listed Tier 1 by BloombergNEF.
The founder
Naomi Zhang
Co-founder and chief executive
Ten years in corporate finance before founding RelyEZ. Master's from the Chinese University of Hong Kong, certificate in quantitative finance from Stanford, formerly at DuPont Hong Kong and two securities houses. She has led the company since its founding in 2019.
European management
Michelle Cross
Director of European development
More than ten years of international business development in renewables, project finance and grid-scale storage. Executive MBA from INSEEC, Sustainable Business Strategy programme at Harvard. She leads strategic partnerships and RelyEZ's expansion on European projects.
Already running
Plants in service, on four continents.
Including Europe: in Hungary, three grid plants have obtained European aFRR certification — the same kind of qualification a French project taking part in system services would need.
Spin the globe — every dot is a site in the manufacturer's portfolio.
Hungary
Becske · Bácsalmás · Tiszakécske
55 MW / 110 MWh
European aFRR certification · commissioned 2026
Poland
Puławy
4 MW / 16 MWh
RelyEZ co-developer of the project
Inner Mongolia
Huade, Ulanqab
500 MW / 2 000 MWh
80 containers · in service since 2025
Yunnan, China
Yao'an, Chuxiong
300 MW / 600 MWh
First storage plant in Yunnan
Yunnan, China
Xundian
200 MW / 400 MWh
In service since 2025
Guangdong, China
Shanwei
200 MW / 400 MWh
35 kV cascaded storage · commissioned 2026
Japan
Bessho
2 MW / 8 MWh
System services · in service since 2025
Xizang, China
Gangba
40 MW / 193 MWh
Solar + storage, the highest-altitude in the world
The range
From the 5 MWh container to the workshop cabinet.
See the full catalogueFour ranges, their configurations and their specifications.
And for your project
A solid manufacturer, a French point of contact.
JR Batteries imports RelyEZ systems into Europe and answers for them: customs, logistics, compliance with French standards and extended producer responsibility through to end of life. We design and structure your asset, JR Énergie installs and operates it — and the technology that reaches your site is covered by the warranties, test reports and insurance listed on this page.