The heart of the project is a battery energy storage system (BESS), built by global leader CATL. Solar panels make power only when the sun is out. The BESS captures extra energy in the day and releases it after sunset, turning sunlight into 24/7 power.
How It Works
- Generation – Panels make electricity in the day. Some flows straight to the grid.
- Storage – Extra energy goes into the BESS. It is stored in modular lithium-ion battery packs.
- Discharge – At night, inverters release the stored energy back into the grid.
- Grid Services – The batteries also keep the grid stable, just like fossil plants once did.
Why It Matters
- Scale – At 19 GWh, this system is far bigger than most in the world. (Many “large” BESS today are only 100–300 MWh.)
- Efficiency – Modern lithium-ion systems reach 90%+ round-trip efficiency, meaning most of the captured power is delivered.
- Desert Design – In Abu Dhabi’s heat, the batteries need strong cooling, insulation, and safety systems to avoid overheating.
- Long Life – Cycle management lets the batteries last for thousands of charge and discharge cycles.
Technical Annex
The Abu Dhabi 24/7 Solar Project blends massive scale with cutting-edge tech. Developed by Masdar and the Emirates Water & Electricity Company (EWEC), it combines:
- 5.2 GW of solar PV panels.
- A 19 GWh BESS.
Together, they will deliver 1 GW of nonstop clean energy—a global first. The site covers 90 km² of desert. Commercial launch is planned for 2027, with a total cost of about US$6 billion.
