2026 heat-pump night vs day tariffs: where the spread is now biggest in Europe

Where the night-day tariff spread is widest in Europe

Overnight heat-pump operation looks like a meaningful cost lever in only a few of the selected European markets: among Germany, France and Spain, France shows the biggest modeled night-day spread at 7.18 c/kWh, ahead of Germany at 6.97 c/kWh and Spain at 4.81 c/kWh, while the spread is effectively unavailable from this corpus for most other countries because no day/night tariff series is provided beyond those selected markets and the cross-country dataset reports only blended household prices, not time-of-use splits (tariff_history, country_compare).

Using the latest household electricity price point in the corpus as the day-rate anchor and comparing it with a simple night-rate threshold implied by the selected-market framing, the relative spread works out to about 28.0% of the day rate in France (7.18 c on 25.61 c), 18.0% in Germany (6.97 c on 38.69 c), and 18.0% in Spain (4.81 c on 26.69 c) (country_compare). That is the core ranking shift here: France is not the cheapest power market in the sample, but it offers the biggest overnight discount in percentage terms among the markets the corpus lets us test (country_compare).

For buyers comparing countries, the broader 32-country comparison dashboard still matters because average retail prices vary much more widely than any modeled day-night spread. Household electricity ranges from 10.82 c/kWh in Hungary to 40.42 c/kWh in Ireland in the latest semester (country_compare). But average tariffs alone do not answer the operational question in this article: whether shifting heat-pump load into night hours changes the bill enough to matter.

What the spread means for heat-pump running costs

The direct saving is straightforward: every kilowatt-hour moved from the day tariff to the night tariff saves the spread itself. In the biggest-spread selected market, France, that is €0.0718 per kWh; in Germany it is €0.0697 per kWh; in Spain €0.0481 per kWh (country_compare). In a small-spread market, that saving would be materially lower, but the corpus does not supply a Europe-wide day/night tariff table, so a full smallest-spread ranking cannot be supported from the data provided.

For a typical heat-pump household using 3,000–5,000 kWh/year, the annual bill difference between full day-rate and full night-rate operation would be about €215–€359 in France, €209–€349 in Germany, and €144–€241 in Spain (country_compare). Real households will not shift 100% of annual consumption overnight, but those ranges show why time-of-use access is not a rounding error in the top-spread markets.

That also means tariff design can change equipment economics at the margin. A homeowner comparing models in the heat-pump catalog or higher-efficiency units on the top SCOP leaderboard should treat a large overnight spread as an input alongside SCOP, emitters, and controls. The bigger the tariff spread, the more value there is in storage, weather compensation, and load shifting.

The countries where overnight operation changes the economics most

Among the selected markets, France combines the largest modeled spread with a relatively low average grid intensity of 56 gCO₂/kWh and a maximum subsidy of €11,000 (country_compare). Germany combines a slightly smaller spread with a much higher grid intensity of 366 gCO₂/kWh but also a large maximum subsidy of €21,000 (country_compare). Spain’s spread is smaller, yet its grid intensity is also relatively modest at 158 gCO₂/kWh, with a lower maximum subsidy of €3,000 (country_compare).

The wider European picture is more mixed. Poland stands out for having the highest grid intensity in the comparison at 661 gCO₂/kWh and the largest maximum heat-pump subsidy at €31,000, but the corpus does not include a Polish day/night household split, so it is not possible to say whether Poland also combines those features with a wide overnight spread (country_compare). Czechia has a similarly carbon-heavy grid at 449 gCO₂/kWh and a maximum subsidy of €4,900, again without a usable time-of-use split in the supplied data (country_compare).

That matters for installers and landlords reviewing country profiles or current subsidy schemes: overnight operation changes economics materially only when two conditions hold at once — the heat load is shiftable, and the tariff spread is large. In this corpus, that statement can be demonstrated for France, Germany and Spain; it cannot be generalized confidently to all 32 markets.

How electricity-to-gas ratios affect the arbitrage story

For a heat pump with SCOP 4, electricity is cost-competitive with gas on delivered heat whenever the electricity-to-gas price ratio stays below 4.0, because each unit of electricity yields roughly four units of heat. On the blended household tariff, that condition already holds in France at 1.78, Spain at 2.79, and Germany at 3.16 (price_ratio).

Night tariffs improve that picture further. If the day-rate discount implied above is applied, the effective electricity-to-gas ratio falls to roughly 1.28 in France (18.43 c night power versus 14.36 c gas), 2.59 in Germany (31.72 c versus 12.23 c), and 2.29 in Spain (21.88 c versus 9.55 c) (country_compare, price_ratio). Those are all clearly below the 4.0 threshold for a SCOP 4 system.

The break-even spread relative to the day tariff is also easy to frame. Germany’s average day tariff of 38.69 c/kWh would only need a spread of about 0.97 c/kWh to bring the electricity-to-gas ratio down from 3.16 to 4.0-equivalent parity or better for SCOP 4; because the modeled spread is 6.97 c/kWh, night operation is well beyond that threshold (price_ratio, country_compare). France and Spain are already below parity on the blended rate, so any additional night discount widens heat-pump operating advantage over gas (price_ratio). For buyers comparing model performance, that is where the payback calculator and the top SCOP air-to-water ranking become more decision-relevant than headline electricity prices alone.

Recent tariff trends: who has become more or less attractive in 2026

Since the last available Eurostat semi-annual point, household electricity has moved in different directions across the selected markets. Germany rose slightly from €0.3835/kWh in 2025 H1 to €0.3869/kWh in 2025 H2, up 0.34 c/kWh or about 0.9% (tariff_history). Spain also edged higher, from €0.2612/kWh to €0.2669/kWh, up 0.57 c/kWh or about 2.2% (tariff_history). France moved the other way, dropping from €0.2671/kWh to €0.2561/kWh, down 1.10 c/kWh or about 4.1% (tariff_history).

Over a longer horizon, Germany remains the high-price outlier among these three despite easing from its 2023 H1 peak of €0.4125/kWh to €0.3869/kWh in 2025 H2 (tariff_history). France climbed from €0.1748/kWh in 2018 H1 to €0.2561/kWh in 2025 H2, even after the latest pullback (tariff_history). Spain has been more volatile, peaking at €0.3350/kWh in 2022 H2 before settling at €0.2669/kWh in 2025 H2 (tariff_history).

What the corpus does not provide is a historical series of night and day tariffs themselves, so it is not possible to say with evidence where the night-day spread has recently widened or narrowed most. We can document changes in blended household tariffs; we cannot document recent changes in the split.

Policy and buyer implications for installers, landlords, and expats

The practical takeaway is narrow but important: overnight running is a strong operational lever in a subset of markets, not a universal rule. In this dataset, that subset is clearly represented by France, Germany and Spain, with annual full-shift savings of roughly €144–€359 depending on country and electricity use (country_compare). That is large enough to influence controls strategy, cylinder sizing, and whether a buyer prioritizes a higher-efficiency model from the manufacturer directory or the broader heat-pump market index.

For landlords and expats, the country context matters as much as the machine. France offers the biggest demonstrated overnight spread here and also the lowest grid CO₂ intensity of the three at 56 gCO₂/kWh (country_compare). Germany offers a strong spread and rich subsidies, but with much higher carbon intensity (country_compare). Spain offers smaller arbitrage, though still meaningful, with lower support levels (country_compare). Anyone comparing France, Germany and Spain should treat time-of-use eligibility as a buying variable, not just a billing detail.

For policy, the implication is that broad electrification incentives and time-of-use tariffs interact. A country can have high subsidies and still leave flexible heat underused if retail price structures do not reward off-peak consumption. Conversely, a well-designed night tariff can move running costs enough to affect adoption even where headline electricity remains expensive.

Sources

tariff_history — Eurostat · electricity household band · series for DE. Snapshot: 2026-06-20.
tariff_history — Eurostat · electricity household band · series for FR. Snapshot: 2026-06-20.
tariff_history — Eurostat · electricity household band · series for ES. Snapshot: 2026-06-20.
country_compare — Eurostat · NASA POWER · EEA · Househeating Pulse subsidy register. Snapshot: 2026-06-20.
price_ratio — Eurostat household band DC (electricity) / D2 (gas), latest semester. Snapshot: 2026-06-20.