BYD's 11.275 GWh Masdar Deal: Inside Abu Dhabi's World-First 24/7 Solar-Storage Mega-Project

The $6 Billion RTC Project: A New Benchmark for Renewable Energy

The Masdar-EWEC Round The Clock (RTC) project is designed to solve renewable energy's biggest challenge: intermittency. By pairing an enormous solar farm with the world's largest battery storage system, it aims to prove that solar power can provide reliable, baseload electricity 24 hours a day, 7 days a week . The project's key specifications, confirmed by Masdar's official newsroom and multiple industry sources, include:

• Total Investment: ~$6 billion (AED 22 billion)
• Solar PV Capacity: 5.2 GW
• Total Battery Storage: 19 GWh
• Continuous Clean Energy Output: 1 GW of baseload renewable power, 24/7
• Developers: Masdar (Abu Dhabi Future Energy Company) and Emirates Water and Electricity Company (EWEC)

The project spans a massive site of over 90 square kilometers in the Abu Dhabi desert . The groundbreaking ceremony in June 2026 was witnessed by Sheikh Theyab bin Mohamed bin Zayed Al Nahyan, underscoring its national importance . Initial solar panel installation was reported as early as October 2025 , and the project is widely expected to begin delivering power in 2027 . This initiative is partly driven by a surge in energy demand from AI data centers in the UAE .

BYD's 11.275 GWh Contract: Scope and Precision

BYD Energy Storage signed the agreement with Masdar in July 2026, officially committing to supply 11.275 GWh of battery energy storage system (BESS) equipment . Multiple Chinese-language financial and energy news outlets report the precise figure, which is slightly smaller than the rounded 11.3 GWh often used in headlines . Sohu's report describes BYD as a "key provider of energy storage solutions" for the project . The scope involves supplying the full BESS for BYD's portion of the project's total storage capacity.

The Supplier Puzzle: BYD, Sungrow, and CATL

The RTC project's 19 GWh storage requirement has been split among leading Chinese battery suppliers, creating an evolving picture:

CATL was initially named the preferred BESS supplier when the project was announced during Abu Dhabi Sustainability Week in January 2025 . In May 2026, Sungrow won a 7.5 GWh order for the same project . The combined total of BYD and Sungrow's reported shares (11.275 + 7.5 = 18.775 GWh) closely matches the project's 19 GWh total. It is not fully clear from available sources whether CATL was replaced or if all three suppliers are contributing in a different final arrangement.

BYD's Broader Energy Storage Pivot

The Masdar deal is not an isolated win. It is part of a strategic pivot for BYD, which is increasingly competing not just in EV batteries but in the global stationary energy storage market as a major second growth engine .

The 12.5 GWh Saudi Arabia Mega-Project

In early 2025, BYD Energy Storage signed a landmark contract with Saudi Electricity Company (SEC) for 12.5 GWh of grid-scale BESS, making it the world's largest single grid-scale storage deployment at the time of signing . The project is split across five sites in Riyadh, Qaisumah, Dawadmi, Al Jouf, and Rabigh, each a 500 MW / 2,500 MWh installation . Combined with a prior 2.6 GWh project, the total BYD-SEC collaboration has reached 15.1 GWh . BYD began shipping equipment for this project in April 2025 from Guangxi's Beibu Gulf Port , with commercial operation dates targeted for 2027-2028 .

The Haohan System: Record-Breaking Technology

BYD's recent contract wins are underpinned by the launch of its next-generation "Haohan" (Hao Hang) energy storage system in September 2025 . This technology is central to BYD's ability to deliver massive-scale projects like the ones in the UAE and Saudi Arabia.

Key specifications of the Haohan system :

• Core Battery: Powered by the world's largest mass-produced 2,710 Ah blade battery, delivering over 300% higher capacity than conventional products.
• Single-Unit Capacity: The smallest system unit delivers 14.5 MWh, the highest globally to date.
• Energy Density: Achieves a volumetric energy density of 233.8 kWh/m³, a 51.4% improvement over industry averages.
• Footprint Reduction: Reduces the footprint of a 1 GWh site by 33% compared to rival systems.
• Market Position: BYD shipped approximately 60 GWh of BESS globally in 2025, capturing ~13% of the world market .

The Masdar deal, the Saudi mega-project, and the Haohan product launch collectively signal an aggressive and well-funded diversification strategy. The Middle East, with its massive renewable energy ambitions and need for grid stability, has emerged as BYD's largest external market for stationary storage .