EDF Consortium Forecasts 1.98 GW and 17,970 MWh from Oman Pumped Hydro Project
The Wadi Dhayka scheme targets nine-hour storage using an existing dam, as EDF builds storage capacity on two fronts amid negative-price curtailment pressures in France.
An EDF-led consortium's Wadi Dhayka pumped hydro project in Oman is projected to deliver close to 1.98 GW of capacity and 17,970 MWh of storage over a nine-hour discharge window, oilprice.com reported Sunday (2026-09-06). The scheme uses the existing Wadi Dhayka Dam as a lower reservoir, absorbing surplus solar and wind output before dispatching power during peak demand periods to stabilise the grid and reduce fossil fuel reliance.4
The project sits within a broader Omani renewable push that EDF has joined on multiple fronts. The French utility also leads a consortium awarded the 500-MW Sinaw solar project in the sultanate, oilprice.com reported Sunday (2026-09-06). Oman, a significant oil and gas producer, has been pushing to develop renewable generation capacity and cut reliance on fossil fuels for domestic power.4
For EDF, the Wadi Dhayka commitment extends a storage pipeline it is simultaneously building at home. On Thursday (2026-06-11), EDF's renewables subsidiary told Montel that the company holds a 1 GW portfolio of battery storage projects in France, with 100 MW expected to begin construction in 2026 and a further 170 MW scheduled to start in 2027. EDF described those projects as mainly co-located with renewable assets.2
The French storage push has an immediate economic driver. EDF OA, the division managing power sales for renewable assets under feed-in tariffs, began halting output at 842 MW of solar and wind farms during negative price periods from the week of 2026-05-25, Montel reported on Thursday (2026-05-21). Negative power prices have grown more frequent across western European midday markets as solar output expands faster than the flexible capacity needed to absorb it.1
French nuclear supply amplifies that dynamic. Analysts told Montel on Wednesday (2026-06-17) that EDF could revise its 2026 nuclear output guidance upward from the stated 350-370 TWh range, with some estimating 380 TWh was more likely given generation performance in the year to date. More nuclear output raises the probability of price-negative hours at midday, particularly in spring and autumn when load is low and solar ramps are at their steepest. Storage that can absorb those surplus hours and redispatch into evening demand peaks gains direct commercial value as those episodes multiply.3
The 270 MW of battery capacity EDF has announced for France over the next two years (100 MW in 2026, 170 MW in 2027) represents a limited increment measured against an 842 MW curtailment base. EDF has not disclosed whether additional tranches from its 1 GW portfolio will be announced, or on what timeline the remaining capacity might enter construction.2,1
In Oman, the Wadi Dhayka figures remain a forecast without a published commissioning date. Oman's clean energy programme has already seen setbacks elsewhere: BP and a consortium including Engie and Pesco withdrew from planned green hydrogen projects in the country, the same Sunday (2026-09-06) oilprice.com report noted. The hydrogen withdrawals involve a different technology and different commercial risks than a pumped hydro scheme built on existing dam infrastructure, but they underline the gap between national renewable targets and project delivery in a market still building its track record with large-scale storage.4
A construction start date and an updated capacity confirmation from the Wadi Dhayka consortium are the next concrete tests for the project's stated numbers.4