Compara tarifas luz: cut bills with time bands
Updated: 2026-08-12 · Services and tariffs
Key points
- Smart meter data reveals whether punta-heavy habits erase time-of-use savings.
- Weekend and holiday schedules differ from weekday office routines.
- Standing power charges dominate low-consumption second homes.
- Some retailers add loyalty discounts that expire after twelve months.
- Solar self-consumption changes which export tariff complements your plan.
Consumption habits beat generic averages
Searchers who compara tarifas luz often paste national average kWh figures into comparators. That hides the reality of remote work afternoons running AC during punta, or retirees who load washing machines at midday llano. Export three months of hourly data from your distributor portal or retailer app. Map heavy loads—cookers, water heaters, pool pumps—to the price bands each tariff advertises. A plan cheap for night owls punishes families cooking dinner at 21:00.
Reading valle, llano and punta on your bill
Spanish time-of-use labels group hours differently by season and region. Valle usually covers deep night hours; llano spans mid-morning and afternoon shoulder periods; punta concentrates late evening demand. Fixed tariffs may quote a single energy price but still pass through regulated time-band tolls on the access part. When you compara tarifas luz line by line, separate energy margin from peajes to see where retailers actually compete.
Contracted kW for flats, villas and seasonal homes
A coastal apartment used two months per year may pay mostly for potencia contratada. Before chasing cent-level energy savings, test whether 3.45 kW covers simultaneous oven and AC startup. Permanent residents with heat pumps may need 5.75 kW or more. Distributors approve power changes online; lowering kW reduces fixed euros every month even if unit energy price stays flat.
Indexed, capped and hybrid electricity products
Beyond classic fixed offers, some retailers sell indexed tariffs tied to wholesale pools with a management fee or a temporary cap. These can track PVPC closely while adding customer service bundles. Hybrid contracts mix a fixed tranche with indexed overflow. Evaluate them against pure PVPC if you lack time to shift consumption. Transparency on revision clauses matters more than introductory gifts.
Solar, social bonus and dual-fuel bundles
Homes with photovoltaic self-consumption should compara tarifas luz alongside compensation for exported kWh—net balance rules differ by retailer. Eligible households may stack the bono social discount on regulated components; confirm income thresholds with your autonomous community. Dual gas-electric bundles simplify one bill but can obscure weaker electricity terms—split the products if gas is already competitive.
What you need
- Hourly or monthly consumption curve from distributor or retailer portal
- List of appliances you run during punta versus valle hours
- Current tariff name and renewal date on your contract
- Roof solar or storage status if applicable
- Proof of eligibility documents for bono social where relevant
Recommended steps
- Label a typical weekday and weekend with start times for heavy appliances.
- Download smart-meter usage and colour-code kWh by valle, llano and punta.
- Estimate annual cost under at least two tariff structures with the CNMC simulator.
- Request a potencia study if peaks never exceed 70% of contracted kW.
- Switch only after comparing total annual estimate, not the first-month promo.
Comparison table
| Household profile | Tariff bias | Watch-out |
|---|---|---|
| Office workers, evening cooking | Fixed or mild time-of-use | Punta dinner hour costs |
| Night EV charging | Valle-weighted time-of-use | Weekday daytime AC |
| Seasonal second home | Low contracted kW | Minimum power fees |
| Home solar export | Compensation-friendly plan | Export rate changes yearly |
In this category
FAQ
Where do I get data to compara tarifas luz by hour?
Log into your distributor smart-meter area or retailer app; CSV exports are available on most portals for the last thirteen months.
Will time-of-use always lower my bill?
Only if enough kWh move to valle or llano. Punta-heavy homes often do better on stable fixed energy prices.
Can I compara tarifas luz while still in a permanencia period?
You can compare anytime, but switching early may trigger penalties—check your contract break fee before signing elsewhere.
Do British plugs or voltage affect tariff choice?
Voltage is standard 230 V in Spain; tariff choice depends on consumption timing and kW, not plug type.