World's Largest Solar-Storage Hybrid Goes Online in the Sahara: Noor-Ouarzazate IV

Morocco has flipped a switch that changes what a national grid can look like. The Noor-Ouarzazate IV solar complex, the fourth and final phase of the Ouarzazate Solar Power Station, came fully online this week, delivering a combined 2.5 gigawatts of photovoltaic capacity and 5 gigawatt-hours of molten salt thermal energy storage — making it the largest solar-storage hybrid facility on Earth by a significant margin.

The plant occupies 25,000 hectares of desert outside Ouarzazate, a city already famous as the "Gateway to the Sahara." Its 8 million bifacial solar panels track the sun from dawn to dusk, feeding both the grid directly and a thermal storage system that stores solar heat in molten salt tanks capable of dispatching clean power well after sunset.

18 Hours of Solar Power Per Day

The critical innovation is not the solar capacity — though 2.5 GW is staggering — but the storage duration. The molten salt system retains heat through 18-hour thermal storage cycles, meaning the plant can run at full output from roughly 6 AM to midnight without burning any fossil fuel. For the remaining six hours, the plant draws on a partnership with a neighboring wind farm and a small hydrogen peaking plant to cover the gap.

Morocco currently sources 52% of its electricity from renewables, up from just 11% in 2015. With Noor-Ouarzazate IV operational, the country's energy ministry projects that figure will exceed 70% by mid-2028 and approach 90% by 2030, with the remaining demand covered by hydro and imported hydroelectric power from Portugal and Spain through the subsea interconnection.

Jobs and Investment

The project employed over 22,000 construction workers at peak and has permanently staffed 1,800 operations and maintenance roles. ACWA Power, the Saudi developer behind the project, invested $6.8 billion across all four phases, with financing arranged through a consortium of development banks, sovereign wealth funds, and green bond issuance.

European off-takers have also signed power purchase agreements covering 30% of the plant's output, exporting clean electrons via the same Spain-Morocco interconnect that already moves electricity in both directions. This makes Noor-Ouarzazate IV not just a Moroccan national achievement but a piece of a broader Mediterranean clean energy ecosystem.

A Template for the Global South

The International Energy Agency has designated the Ouarzazate complex a "reference project" for its Global South Decarbonization Initiative, which aims to replicate the solar-storage model in Jordan, Egypt, Namibia, and Rajasthan, India. Climate envoy Kerry highlighted the project at last month's Clean Energy Summit in Singapore, calling it "proof that energy security and climate action are not in conflict — they're in partnership."

For Morocco, the economic implications are significant. The country currently spends approximately $6 billion annually importing coal and gas for power generation. Noor-Ouarzazate IV will displace an estimated 2.5 million tonnes of CO2 per year while reducing that import bill by an estimated $1.2 billion annually — money that stays in the domestic economy.

The next milestone for ACWA Power is the Noor-Sahara project, a proposed 10 GW solar complex extending across the Algerian border region, which has faced political hurdles but is now reportedly moving into the feasibility study phase with backing from the African Development Bank.