Your energy bills hit EUR 150 last month. Three months later, it's EUR 195. Why? The difference between fixed and variable electricity rates. This guide explains exactly how each tariff works, when you should choose one, and how much you could save by understanding the difference. Spoiler: choosing the right tariff type can save EUR 200-600 annually for an average household.
What Is a Fixed Rate Energy Tariff?
A fixed rate electricity tariff locks your energy price per kilowatt-hour (kWh) for a set contract period, typically 12-36 months. Once you sign the contract, your per-kWh rate stays the same regardless of market conditions. This means if the wholesale energy market skyrockets—like during winter energy crises—your rate remains stable.
Fixed rates include both the energy charge (EUR/kWh) and distribution/network fees, which are also locked in. For example, you might pay EUR 0.28 per kWh regardless of whether the wholesale price jumps to EUR 0.50 or falls to EUR 0.15. Your monthly bill fluctuates based on consumption alone, not market prices.
Fixed rates are typically higher than variable rates at the time of signing because energy suppliers build in a margin to cover their risk if prices rise. Suppliers essentially bet that prices will go up; if they're wrong, they absorb the loss. If prices do rise significantly, you benefit enormously from that protection.
What Is a Variable Rate Energy Tariff?
A variable rate tariff means your energy price per kWh fluctuates monthly or quarterly based on wholesale market prices. When the wholesale price drops, so does your tariff (usually with a 4-8 week delay). When prices spike, your rate increases accordingly. Your distribution fees may be fixed, but the energy component varies.
Variable rates typically start lower than fixed rates during stable market periods. If you sign up during a market downturn, you could pay EUR 0.18-0.22 per kWh. But if wholesale prices surge (like during extreme weather or supply shortages), your variable rate could spike to EUR 0.40-0.60 per kWh, creating EUR 50-100 surprises in a single month.
Variable rates give energy suppliers minimal risk—they pass market costs directly to customers. This is why variable rates are cheaper when markets are calm and more expensive when chaos strikes. You bear all the market risk, not the supplier.
Fixed vs Variable Rate: Side-by-Side Comparison
Real-World Cost Example: EUR 2000 Annual Consumption
Let's say your household uses 5,000 kWh annually (European average for a 3-bedroom home). Here's what you'd pay under different scenarios:
In this scenario, the fixed rate customer paid EUR 600 more upfront but avoided EUR 600 in variable spikes. Net result: approximately the same cost, but fixed rate offers peace of mind. However, if prices had fallen instead of risen, the fixed customer would have overpaid by EUR 600 with no way out.
Mermaid Diagram 1: How Fixed and Variable Rates Move Over Time
Mermaid Diagram 2: Decision Tree—Which Tariff Is Right for You?
When To Choose Fixed Rate (And Lock In Your Price)
Choose a fixed rate tariff in these situations:
When To Choose Variable Rate (And Stay Flexible)
Choose a variable rate tariff in these situations:
How Market Prices Move: The Forces Behind Rate Changes
Understanding why variable rates change helps you predict future spikes. Energy prices are driven by five major factors:
1. Wholesale market supply and demand: During winter, heating demand spikes, pushing prices up. During summer, demand drops, pulling prices down. Extreme weather (harsh winters, droughts reducing hydro) creates short-term spikes.
2. Fuel costs and geopolitics: Natural gas prices depend on global politics (Russia-Ukraine war), OPEC oil decisions, and LNG shipping costs. A single geopolitical event can double prices overnight.
3. Renewable energy availability: High wind = low prices (wind farms flood the grid with cheap electricity). Low wind + high demand = price spikes. Solar production is predictable by season.
4. Interest rates and inflation: Central bank policy affects energy company financing costs, which flow through to consumer tariffs with a 3-6 month lag.
5. Grid constraints and infrastructure: Congested transmission lines can create regional price differences. Maintenance of power plants temporarily reduces supply, spiking prices.
How To Switch from Fixed to Variable (Or Vice Versa)
Locked into a bad fixed rate? Want to move from variable to fixed? Here's the process:
Hidden Costs and Gotchas: Read the Fine Print
Both fixed and variable rates hide surprise fees. Watch for:
Fixed rate gotchas: Early termination fees (EUR 50-300), non-cancellable lock-in periods, 'rate adjustment clauses' that allow suppliers to raise rates under certain conditions (if transmission costs spike), minimum consumption thresholds (if you use less, penalties apply).
Variable rate gotchas: Price cap limits (government-mandated caps prevent upward swings but also cap savings during price crashes), hidden fees disguised as 'administration charges' or 'meter reading fees', automatic contract renewal into unfavorable new rates, payment method fees (credit card surcharges for autopay).
Pro tip: Always calculate 'all-in cost per kWh' by dividing total annual bill by total kWh consumed. This single number allows apples-to-apples comparison across suppliers.
Mermaid Diagram 3: Energy Price Volatility—Historical Context (2022-2026)
Assessment: Which Tariff Type Is Right for Your Household?
1. What best describes your household's financial situation?
2. How much time will you spend monitoring energy prices?
3. What does the current energy market forecast suggest?