Greece Outage Report: May 2026 — Community Data Summary

Every month, Outage.gr publishes a summary of community-reported utility outages across Greece. These reports are compiled from anonymously submitted, community-verified entries in our database — data that represents real disruptions experienced by real residents and confirmed by their neighbours. This is our summary for May 2026.

May 2026 Overview

May 2026 was a transitional month for Greek utility reliability — the relative calm of spring giving way to the first elevated-demand periods of summer. Overall community report volumes were higher than March and April but below the summer peak levels typically seen from July onwards.

Power outages continued to account for the largest share of reports (approximately 67%), followed by internet disruptions (around 24%), and water supply issues (approximately 9%). This distribution is consistent with the long-term patterns in our dataset.

The month included two notable weather events that drove report clusters: a mid-May Mediterranean low pressure system that produced strong winds across the Aegean and central Greece, and a late-May heat episode that pushed temperatures above 35°C across much of the mainland. Both events produced distinct report clusters visible on our live map.

Most Reported Cities in May

Based on community submissions with at least one community confirmation during May:

Athens and the Attica region remained the highest-volume area by absolute report count, consistent with its population size. When normalised for population, several smaller cities showed elevated per-capita rates: communities in the prefectures of Evia, Boeotia, and parts of the Peloponnese showed higher relative rates, consistent with an older distribution infrastructure serving these areas.

The areas most affected by the mid-May wind event were concentrated in the central Aegean islands and the eastern mainland — Euboea, Phthiotis, and parts of Magnesia — where overhead line faults from wind loading produced the largest report clusters of the month.

The late-May heat episode produced a different geographic distribution: reports concentrated in the inland regions of Thessaly and the northern Peloponnese, where the heat was most intense and air conditioning load was highest relative to local grid capacity.

Restoration Times

Median restoration times for resolved reports in May 2026:

For urban areas (Athens, Thessaloniki, Patra, Larissa, Volos, Heraklion): the median restoration time for resolved reports was approximately 1 hour 55 minutes — slightly better than the same period in 2025, consistent with DEDDIE's ongoing investment in urban network automation and underground cable conversion.

For suburban and peri-urban areas: median approximately 2 hours 40 minutes, broadly unchanged year-on-year.

For rural and island communities: the data shows high variance, reflecting the diversity of infrastructure quality across these areas. Median figures are less meaningful here than the range: the fastest rural restorations completed in under an hour; the slowest extended to six hours or more.

The two weather events produced predictable degradation in restoration times during the affected periods. During the mid-May wind event, median restoration times for wind-affected areas rose to approximately 4 hours as DEDDIE crews managed multiple simultaneous faults.

Utility Type Breakdown

Power outages (67% of reports): Dominated by the two weather events described above. The proportion of wind-related faults (identifiable by geographic clustering and event timing) was higher than typical for May, which is usually a calmer month.

Internet outages (24% of reports): The majority of internet-specific reports (where the reporter identified their ISP) were concentrated in urban areas during periods of high network load. Several reports coincided with the power events, reflecting the secondary effect of power cuts on ISP infrastructure. Cosmote, Vodafone, and Nova all appeared in the provider data for May; normalised by estimated subscriber count, per-subscriber rates were broadly comparable across the major providers.

Water supply (9% of reports): May is typically a lower-risk month for water outages in Greece compared to summer. The May water reports were predominantly short-duration events in regional municipal areas, consistent with routine maintenance or pipe repair work rather than demand-driven stress.

What May's Data Tells Us About the Coming Summer

May's late-month heat episode is a preview of what the June–September period will bring. The geographic pattern of heat-related reports — inland Thessaly, northern Peloponnese, eastern Attica suburbs — is consistent with the areas that have historically shown the highest vulnerability during summer heatwave events.

Residents in these areas should treat May's episode as a drill. If the heat exposed gaps in your preparation — depleted phone battery, no surge protection on electronics, no bottled water reserve — address them now, before the more sustained summer heat arrives.

How to Use This Data

The city-level data underlying this summary is visible in real time on each city's dedicated page on Outage.gr. Every city page shows the current week's outage count, average restoration time computed from community reports, recent outage history, and upcoming DEDDIE scheduled maintenance.

The My Area section — accessible from the bottom navigation — shows outages and scheduled maintenance near your precise location, updated in real time as community reports come in.

About This Report

This monthly summary is compiled from community-reported data on the Outage.gr platform. All reports are submitted anonymously by residents and verified by their neighbours through the "Me Too" confirmation system. Figures represent community-reported events and should be understood as a floor estimate of actual outage frequency — outages that go unreported (more common in areas with lower platform adoption) are not captured.

We publish this report at the start of each month covering the previous month's data. It is the only publicly available community-sourced, region-level outage frequency and restoration time dataset for Greece.