€335 Million in Tax From EDP's Douro Dam Sale May Lapse in October if the Fisco Fails to Collect
The Tax Authority has until October to collect €335.2 million owed on EDP's 2020 sale of six Douro dams, or lose the right to it under caducidade rules. The PS is demanding answers; a regional movement warns of a scandalous tax write-off.
More than €335 million in tax owed on EDP's 2020 sale of six hydroelectric dams could quietly disappear this autumn. According to reporting on the case, the Autoridade Tributária (Tax Authority) has until October to formally assess and demand the €335.2 million before the right to collect it expires under the rules of caducidade — the legal deadline after which the State can no longer claim a tax. If the Fisco lets the clock run out, the money is gone for good.
The Socialist Party (PS) has now pressed the government for answers. Deputy Miguel Costa Matos asked ministers to clarify whether the Tax Authority warned them of the risk, and whether a promised decree-law — meant to channel the eventual revenue to the affected northeastern regions — has been left to stall. The PS says it first raised the matter with the Finance Ministry back in April 2024 and never received a reply. "It would be incomprehensible," Costa Matos said, if the taxes ended up uncollected.
How €335 million ended up on the line
At the end of 2020, EDP sold six dams on the Douro and Sabor rivers — Miranda do Douro, Picote, Bemposta, Baixo Sabor, Feiticeiro and Tua — to a consortium led by the French group Engie, in a deal worth about €2.2 billion. The transaction was contentious from the start. EDP structured it as a corporate demerger (cisão-fusão) rather than a straight sale, an arrangement critics argued was designed to sidestep taxes such as the Imposto Municipal sobre Transmissões (IMT, municipal property-transfer tax) and stamp duty. Local movements in Trás-os-Montes, including the Movimento da Terra de Miranda (Miranda Land Movement), have campaigned ever since for the region to see some benefit from the sale of assets built on its rivers.
That group has now warned that unless the Tax Authority acts within roughly two months, the outcome will amount to a "scandalous tax forgiveness." The dispute has run through the courts and the tax arbitration system for years; the October horizon is the point at which, for at least part of the bill, the argument becomes moot.
What This Means for Expats
- A test of tax fairness. The episode lands amid a wider debate over whether large corporate tax bills in Portugal are collected as rigorously as ordinary residents' are — the same concern the Court of Auditors raised when it flagged that €21 billion in annual tax breaks escapes real scrutiny.
- Regional money at stake. If collected, part of the revenue was earmarked for the interior districts around the dams — a rare direct payback for one of Portugal's most depopulated regions.
- Energy politics you will keep hearing about. The dam sale sits alongside EDP's other big moves this year, from abandoning its Alqueva floating-solar plan to the revived €34.4 million competition fine against the utility.
For a government already leaning on one-off levies such as the new windfall tax on oil profits to shore up its accounts, letting €335 million lapse would be an awkward look. Whether the Tax Authority moves before October — and whether ministers answer the PS — will show how seriously Lisbon treats a bill it has had six years to collect.
