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FranjaLuz gets the hourly Spanish electricity market prices published every day by REE through ESIOS, its open data portal. It's the same official data used by electricity suppliers.

The PVPC (Voluntary Price for Small Consumers) is the regulated tariff whose price changes every hour according to the electricity market. FranjaLuz shows you that price so you know when it's best to use power.

REE (Red Eléctrica de España) is the operator of the Spanish electricity system. Through ESIOS, its open data portal, it publishes the hourly electricity market prices that make up the PVPC every day. FranjaLuz downloads that data automatically.

We show the PVPC energy price, before taxes and your supplier's network charges. You can choose to see it in €/kWh or €/MWh from Settings.

FranjaLuz's price is indicative: it doesn't include taxes, network charges or your supplier's margin, which do appear on your final bill.

REE publishes next-day prices at around 20:15, and FranjaLuz starts checking for them then so it can show them as soon as they're available. Until then, you'll find an estimate on the Tomorrow tab in Hourly price.

They're the three levels FranjaLuz splits the day's price into, worked out by comparing each hour's price with the rest of the day. You can change what they're called from Settings → Slot names.

The Hourly price screen highlights the cheapest and the most expensive hour of the day, so you can see at a glance when it's best to use power.

The price follows the PVPC, the regulated tariff of the Spanish electricity market, which sets a different price for each of the 24 hours in the day.

In some hours, high supply combined with low demand can push the energy price below zero. FranjaLuz shows the official value without clipping it, including in History. This does not mean your total bill will be negative or that your electricity supplier will pay you to consume: it depends on your tariff and the other charges on your bill.

It's the price for the current hour. It only changes when a new hour starts, and you can view it in €/kWh or €/MWh depending on what you choose in Settings.

It's a forecast of each hourly price for tomorrow, so you can plan ahead before Red Eléctrica publishes the official prices at around 20:15. You'll find it in Hourly price, on the Tomorrow tab.

From 6:00 it shows as “Indicative”: our model works it out from recent data and Red Eléctrica's demand, wind and solar forecast, and it's mainly useful for spotting which hours are likely to be cheapest.

At around 13:30, once the wholesale market has set tomorrow's prices, it switches to “With wholesale prices” and becomes more accurate. When the official prices arrive, they replace the estimate.

The estimate shows an approximate price for each hour and the usual margin of error. In “Estimated vs. actual” you can compare, day by day, what we would have estimated the day before with the price REE published: the average deviation and the accuracy percentage for identifying cheap hours. Use it to plan; the official price is the one that counts.

If you have solar panels, the electricity you produce, don't use and export to the grid is your surplus. Turn on Self-consumption in Hourly price and you'll see, in purple next to the consumption price, the surplus compensation price for each hour: the official one for PVPC with simplified compensation. You can also see it in the detail of any day in History since June 2021, where it's turned on separately. FranjaLuz only shows prices: it doesn't connect to your panels, measure your production or calculate your bill. On a free-market tariff, your surplus price depends on your contract.

We compare each hour's price with your appliance's consumption and show you the slot where you'll pay the least to use it.

We multiply its power by how long you use it each day and by the price of the hour you switch it on, to give you an estimated cost.

Yes. When you add an appliance, you say how long you use it each day, and that's what we use to work out its cost and the best slot.

It's the time window when that appliance is cheapest today, based on its power and the usage time you gave.

For the period you choose, History shows a summary with the average and the cheapest and most expensive intervals, a comparison with the previous period, a price evolution chart and a detailed list.

You can choose 1, 3 or 6 months, 1 year or All. From the date picker, you can also view the last 15 days or choose a custom range. Daily summaries are available from 1 June 2021 through the latest published day.

To keep the chart readable, FranjaLuz adapts the detail to the period by showing daily, weekly, monthly, quarterly or yearly averages. You can open an interval to drill down to each day.

FranjaLuz compares the period average with an earlier interval of the same length and shows whether it was cheaper, more expensive or barely changed. The comparison may be unavailable for All or when there is not enough data.

Yes. Open a day from the chart or list to see its average, minimum, maximum and, when available, each hourly price. If the hourly detail is missing, the daily summary is still valid. If you turn on Self-consumption in the detail, you'll also see the surplus price for each hour.

From History, open Generation history to see how much electricity was generated each day and by which technologies (wind, solar, nuclear, hydro…), how much of it was renewable, demand, exchanges with other systems and CO₂ emissions. The data comes from Red Eléctrica de España (REE).

There is data for every complete day from 2011 up to the latest one REE has published. Days in the current and previous month are provisional, and REE may revise them. Without Premium you can check the days of the latest published month; with Premium, the whole history.

There are three kinds. Automatic alerts tell you about tomorrow's prices, when the cheapest or most expensive slot starts, or when the price crosses a threshold you pick. Hourly price alerts are set by tapping the bell on any hour, including in tomorrow's estimate. And in My alerts you create your own reminders. They all arrive even if the app is closed, as long as notifications are turned on.

No. Alerts are scheduled by the system and arrive even if you've closed the app, as long as notifications are turned on.

Check that notifications are turned on for FranjaLuz in your system settings, and that the alert is still set up in Alerts: hourly price alerts clear themselves once they fire. If “Only in my zones” is on and you were outside all of them, we don't notify you, except for custom alerts you've set to sound outside your zones too.

Go to Alerts, find the one you want and switch it off, or remove it from the list of active alerts. Custom alerts live in Alerts → My alerts: switch them off there or open one to delete it.

Reminders you create from Alerts and then find in My alerts: with a title, an optional note, an icon, a time and how often they repeat (once, every day, Monday to Friday, weekends or the days you choose). You can mark them as urgent or let them sound outside your zones too. Without Premium you can have one; with Premium, up to 12.

Mark your home, your work or other places on the map, each with its own radius, and FranjaLuz will only notify you while you're inside one of them: if it confirms you're outside all of them, the alert isn't sent. It needs your precise location, including in the background; without that permission, or with location turned off, we notify you anyway. Your zones are stored on your phone and we don't keep a history of your locations. Without Premium you get one zone; with Premium, up to 5.

Yes. In Alerts → Customize alerts, pick an alert type and write your own title and message. You can add automatic data, such as the time or the price, which is filled in on every alert; the preview shows how it will look, and you can send yourself a test alert or restore the default text. Without Premium you can customize one alert type; with Premium, all of them.

Yes. In Alerts → Alert sound, choose one of FranjaLuz's five sounds (Chispa, Destello, Pulso, Ascenso and Aurora) or the system one, and listen to them first; you can also turn the sound off. It applies to all your alerts. Silent mode and your phone's notification settings can still mute them.

Yes. In tomorrow's estimate, tap any hour to create an alert, just like in Hourly price. It's saved as “Estimated”: when the official prices arrive, we keep the time you chose and update its price and band. If the official prices didn't arrive in time, the notification would show the approximate price, marked as estimated.

From Settings, in the Widgets section, tap the one you want and confirm in the system dialog to add it to your home screen.

Square shows the current price, band and cheapest hour. Horizontal adds the surrounding hours and how much you save by waiting. With gauge shows the price inside a cheap, medium or expensive arc.

Android limits how often a widget can refresh to save battery. If it looks out of date, open the app for a moment to force an update.

They update themselves on every hour, on the hour.

Premium removes ads and expands what you can set up: up to 5 zones and 12 custom alerts, custom text for every alert type, and the full generation history back to 2011. You can activate it with a subscription or a one-off payment, from Settings.

All three options include the same things; the only difference is how you pay: a monthly subscription, a yearly one, or a single payment with no renewal.

Go to Settings and tap Restore purchase. Your purchase also restores itself every time you open the app.

Check that your purchase has restored from Settings → Restore purchase, and that you have an internet connection: your purchase status is checked when you open the app.

The free version is supported by ads, and we need your permission to show them. If you'd rather not give it, you can use FranjaLuz with Premium, ad-free. You can change your mind at any time in Settings → Ad options; if you withdraw permission, you'll need Premium to keep using the app.

If you cancel, you keep Premium until the end of your paid period, and with a reward, until it runs out; we remind you of this in Settings → Your Premium. After that, ads and the free limits come back: we keep your oldest zone and your oldest custom alert that can still go off, delete the rest and let you know in Alerts. Your custom texts aren't deleted, but only one of them applies, and the generation history goes back to showing only the latest month.

It's a look for the app whose background changes automatically with the time of day: morning, midday, afternoon and night.

We match the day's price bands to your region: the Canary Islands, for example, run on a different hour to mainland Spain, so the cheap, medium and expensive bands don't line up with the rest.

Go to Settings → Price unit and choose between €/kWh and €/MWh. It applies across the whole app.

Yes. In Settings → Slot names you can choose another way to name the three price levels.