Masdar-EWEC 5.2 GW Solar + 19 GWh Round-the-Clock Project: Financial Close, Costs and COD

Last updated: September 25, 2026

Masdar and Emirates Water and Electricity Company (EWEC) are building a 5.2 GW solar plant paired with a 19 GWh battery system in Abu Dhabi, designed to deliver 1 GW of flat, round-the-clock (RTC) power. It reached financial close in July 2026 and is under construction, with commercial operation targeted for 2027. It is the largest project of its kind announced to date and the clearest test of whether solar-plus-storage can behave like a baseload plant at gigawatt scale.

Status: Financial Close achieved, Under Construction. Not yet commissioned or operational.

Quick Facts

Timeline

• January 14, 2025 (Announcement): Masdar and EWEC announce the concept at the Abu Dhabi Sustainability Week; suppliers still under discussion.
• October 23, 2025 (Construction start): Groundbreaking witnessed by Sheikh Theyab bin Mohamed bin Zayed Al Nahyan and Dr Sultan Al Jaber.
• July 2026 (Financial Close): US$5.1 billion debt package closed with 13 banks.
• 2027 (target): Commercial operation date.

Status note: a public PPA, an FID announcement and a tariff figure have not been published. What has been confirmed is groundbreaking and financial close. Reports of an EWEC framework agreement in May 2026 concern the wider Masdar-EWEC pipeline, not this project specifically.

Project Economics

At roughly US$6.1 billion for 1 GW of firm output, the headline cost is about US$6,100 per firm kW. That is not comparable with plain solar, which is a fraction of that per nameplate kW. The right comparison is against a gas or nuclear plant delivering the same flat 1 GW, and against the cost of running that gas plant on fuel. The project is 84% debt financed (5.1 of 6.1), a leverage level that signals lenders see a long, contracted, low-risk revenue stream. The tariff has been described only as “competitive” and consistent with EWEC’s existing portfolio; no figure has been disclosed, so any claimed cost per MWh should be treated as unverified.

Technology

The design oversizes solar relative to output on purpose. An illustrative estimate, not a company figure: at about 1 GW of continuous delivery, the system must supply roughly 24 GWh per day; about 10 hours of that can come straight from PV, leaving around 14 GWh to be shifted into the night, which explains why 19 GWh of storage (with conversion losses and reserve) accompanies 5.2 GW of panels. Masdar describes the plant as having grid-forming inverters, virtual power plant capability, black-start capability and AI-enhanced forecasting, features that let a battery-heavy plant support grid stability rather than merely follow it.

Grid Connection

Public materials do not specify the transmission connection or the substation arrangement. Delivering 1 GW of firm power from a large desert site will require new or reinforced high-voltage links into the Abu Dhabi grid; until the operator publishes details, the connection remains one of the least documented parts of the project.

Financing

The 13 banks reported are Abu Dhabi Commercial Bank, Abu Dhabi Islamic Bank, BNP Paribas, Bank of China, Crédit Agricole, Dubai Islamic Bank, First Abu Dhabi Bank, HSBC, KfW IPEX-Bank, Natixis, Sumitomo Mitsui, Standard Chartered and Société Générale (per CleanTechnica; PV Tech did not name them individually). Masdar’s CFO Mazin Khan said the close demonstrates confidence of the international banking community in the project and in Masdar’s financial position. The same lender pool overlaps with the Khazna 1.5 GW solar financing that closed earlier in 2026.

Who Buys the Power?

This is the least resolved question. Early reporting described the project as seeking international offtakers, and Masdar’s COO tied it to AI and data-centre demand. Later coverage names EWEC as co-developer without publishing offtake terms. Until a PPA tenor, counterparty and tariff are disclosed, “who buys the power” should be read as “the Abu Dhabi grid via EWEC, with data centres and industry as intended end users”, not as a confirmed contract.

Why It Matters

If it performs as designed, the project turns the usual objection to solar (it stops at sunset) into an engineering problem with a price. That matters for Gulf states with fast-growing, flat, 24-hour loads such as data centres, desalination and aluminium. It also positions Masdar, which targets a 100 GW portfolio by 2030, as a reference developer for firm renewable supply. The company also cites more than 10,000 jobs and 5.7 million tonnes of CO2 avoided per year.

Risks and Unresolved Issues

• Main technical challenge: commissioning a 19 GWh battery fleet and a very large grid-forming inverter base in a hot, dusty environment; thermal management and degradation over a 25-30 year plant life.
• Main financial challenge: a high capital cost per firm kW that depends on the undisclosed tariff and long PPA tenor holding up.
• What could delay it: module and battery delivery schedules, grid connection readiness, and the pace of commissioning a project with no operating precedent at this size.
• Unknowns: PPA terms, exact tariff, grid interconnection design, guaranteed availability (percentage of hours at 1 GW).

Comparable Projects

• Al Dhafra Solar PV (Abu Dhabi): about 2 GW solar, operational; no storage, so not firm.
• Khazna Solar PV (Abu Dhabi): 1.5 GW solar with a 30-year PPA with EWEC, financial close in 2026 (PV Tech).
• Red Sea Project (Saudi Arabia): 400 MW solar with about 1.3 GWh of storage, an off-grid tourism system; far smaller.
• NEOM Green Hydrogen (Saudi Arabia): a different product, but a similar test of Gulf gigascale delivery; see our NEOM Green Hydrogen profile.

Sources

• Masdar – groundbreaking release
• PV Tech – financial close
• CleanTechnica – financing details and banks
• Energy-Storage.news – suppliers and contractors
• pv magazine – January 2025 announcement
• PV Tech – Khazna 1.5 GW financing

Figures are from company releases and trade press as of September 25, 2026 and are attributed where sources disagree.

Illustrative image. Photo: kallerna, CC BY-SA 4.0, via Wikimedia Commons — source