Most people have heard of Earth Overshoot Day, the date when humanity has used up more from nature than the planet can renew in a whole year. It is a simple idea that lands well, because it turns a complicated global problem into a single, concrete moment in time.
That same logic is what sparked the idea for Fossil Dependence Days.
The concept came out of a conversation within our membership, first raised by the European Heat Pump Association. The question was straightforward: do we have something similar for energy? A date that shows, in plain terms, how dependent a country is on imported fossil fuels?
What is a Fossil Dependence Day?
Fossil Dependence Day marks the point in the calendar from which a country relies entirely on imported fossil fuels to meet its energy needs for the rest of the year. The further into the year that date falls, the less dependent the country is. The earlier it falls, the more exposed.
To calculate it, the Electrification Alliance reached out to the researchers at Ember who looked at what share of a country’s total primary energy demand is covered by net fossil fuel imports. Primary energy means the raw fuel before it has been transformed into electricity or heat, so it captures the full picture of what a country actually consumes. Net imports are then calculated by subtracting a country’s total fossil fuel exports from its total imports. The resulting share is mapped onto the calendar year, and when that portion of the year begins, the country has crossed into fossil import territory.
Take Germany as an example. About two thirds of its energy comes from imported fossil fuels, so its Fossil Dependence Day lands at the start of May. From that point until the end of December, Germany is running on energy it had to buy from abroad. Countries like Ireland or the Netherlands, which import an even higher share, cross that line earlier in the year.
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Why does this matter?
Three quarters of the world’s population live in countries that are net importers of fossil fuels. Fifty countries import more than half of their primary energy as fossil fuels. This is not a niche problem.
The consequences are real and familiar. When fossil fuel markets are disrupted, as happened after Russia’s invasion of Ukraine and more recently through tensions in the Middle East, the costs are passed on immediately to households and industries. Net importing countries spent 1.7 trillion dollars on fossil fuel imports in 2024 alone. Every ten dollar rise in the oil price adds around 160 billion dollars to that global bill.
Fossil Dependence Days make this vulnerability visible in a way that energy statistics alone rarely do. Instead of asking people to parse balance sheets and import ratios, a single date communicates the exposure directly.
What do we do now?
The good news is that the tools to push these dates later in the year exist. Electric vehicles, heat pumps, and homegrown renewable electricity are the most direct levers.
Solar panels have avoided the EU €8.6 billion in gas imports since the conflict in the Middle East began. Around 8 million electric vehicles on European roads saved €3 billion in oil imports in 2025 alone. Heat pumps, now installed in around 26 million homes across Europe, could save €60 billion in fossil fuel import costs by 2030. Wind already provides 20% of EU electricity, cutting fossil fuel imports by around 100 billion cubic metres every year.
But to go further and faster, policy needs to catch up with the technology. In our April 2026 paper on the revision of the EU Energy Security Framework, the Electrification Alliance set out what that looks like in practice.
First, electricity needs to be made more affordable. Across Europe, electricity bills are still burdened by taxes and levies that have little connection to energy itself, making it artificially more expensive than fossil gas and slowing the uptake of heat pumps, electric vehicles and other clean technologies. Member States should use flexibilities available under EU energy taxation rules to bring the electricity-to-fossil fuel price ratio down, and fossil fuel subsidies should be phased out against clear deadlines.
Second, the flexibility potential of the energy system remains largely untapped. Smart charging, vehicle-to-grid technologies, battery storage and demand response can all make the system more resilient while reducing the need for imported fossil fuels. Markets need to be opened up to these resources, and regulatory barriers removed.
Third, none of this works without grids. Electricity grids are the backbone of energy security, and they need to be expanded, modernised and made resilient to both cyber threats and climate-related disruptions. The Energy Security Framework revision is an opportunity to make that a clear priority.
Together, these steps could halve Europe’s import dependency by 2040. That would mean fewer countries exposed to price shocks, less money flowing out of European economies, and Fossil Dependence Days that fall later and later in the year.