Electronic Shelf Labels in Supermarkets

A supermarket changes more prices, on more items, faster than almost any other shop, and sells goods that are weighed, chilled, frozen and pulled for date. That is why an electronic shelf label pays off so well here and goes wrong so easily: shelf, scale and till price must always agree.

This page covers what is specific to grocery, what the rules say, and what chains have publicly reported, with sources in view. It does not recommend vendors. To understand the technology from scratch, start with the guide to what an electronic shelf label is.

What makes a supermarket different

Volume and pace. A large store carries tens of thousands of lines, and a promotional week touches thousands at once. With paper, every change is a print run, a walk down the aisle and a check. The chains’ own announcements say the same thing: El Jamón talks about instant, synchronised price and promotion updates across its network, and Alcampo about fewer errors and staff who no longer spend their time checking and swapping tickets.

A price is more than one number. Shoppers compare by kilo, litre or dozen, so the label carries several figures that must move together: selling price, unit price and, on a reduction, the previous price.

Cold chain and dates. Ambient grocery, chilled and frozen live in the same building. Each zone needs a different label model, a different fixing and sometimes a different pricing policy.

Fresh and weighed products

The service counter is where paper costs most and where the change is most visible. Ham, cheese cut to order and fish are sold by weight, and what the customer pays depends on a scale.

The price per kilo is a label datum, the weight comes from the scale, and the amount is computed by the scale or the till. If the per-kilo price changes in the central system and the scale keeps the old one, the shopper sees one figure on the shelf and pays another. So a fresh-food project is not finished by hanging displays: decide which system the price originates in, and test that label, scale and till read it identically.

There is a public example. According to Alimarket, in Consum’s bakeries the labels are updated from the scale with each new batch from the oven.

Two practical consequences:

• Counter labels are larger and get cleaned more often. Alcampo says it uses larger models on traditional counters.
• Several per-kilo changes a day are normal at a fish or meat counter. If each one depends on someone keying it in two places, the system stops being reliable.

Chilled and frozen

A badly tested project fails here more often than a badly planned one. E-paper displays are specified for a temperature range. In the standard range from one manufacturer we reviewed, operation runs from 0 to 40 degrees Celsius: fine for the sales floor and many chillers, not for a freezer cabinet. Specific models exist; one freezer label datasheet states operation down to minus 25 degrees and up to five years of battery life. Those are vendor claims, not independent tests.

Before you decide:

1. Trial a real cabinet. Condensation, door openings and display temperature in an open chiller differ from any datasheet.
2. Check battery behaviour in the cold. Advertised lifetimes usually assume normal operating temperature.
3. Ask about the radio. In cold rooms and closed metal units, gateway coverage changes. The LCD versus e-paper comparison explains why the display and the communication are separate decisions.

Marking down what expires: the rules

Two different rules get confused here.

The general reduction rule. In the EU, Article 6a of the Price Indication Directive, added by the Omnibus Directive (EU) 2019/2161, requires an announced price reduction to show the previous price, defined as the lowest price in the 30 days before the reduction, and lets member states derogate for goods liable to deteriorate or expire rapidly. How the reference is calculated and documented is on the 30-day reference price page.

National exceptions differ. Germany, for one, exempts reductions on fast-spoiling goods or goods with a short shelf life when the price is cut because of imminent spoilage or expiry and customers are clearly informed (section 11(4) of the Preisangabenverordnung). Spain takes a different route: article 20.1 of its retail trade law (Ley 7/1996) leaves out of the previous-price calculation any price applied to cut food waste on identical products whose use-by or best-before date is close. In the UK, the Price Marking Order 2004 has a separate provision for general reductions (Article 9), which lets a trader announce a reduction in general terms if the details are clearly displayed; it is not the EU 30-day rule. Check the law of the country where the store sits; we have not covered every market.

The waste context. None of these rules requires electronic labels. The trade press does tie the two together: Alimarket’s report on Carrefour’s 2023 renewal with Pricer lists food-waste reduction among the trends the labels support.

In practice the label supplies execution: switching a product family to a new price at four in the afternoon without walking the aisle with stickers. It does not supply the decision on how much to reduce or when. As for savings, the figures that circulate (waste cut by a third or by half) come from vendors. We found no independent, large-scale, controlled study, so we promise no percentage for your store.

Promotion weeks and heavy repricing

A typical campaign combines a new price, a struck-through price, a recalculated unit price and sometimes a multibuy message. With ESL the bottleneck is no longer printing and distribution but preparing the campaign in the pricing system and verifying the till charges the same.

• One source of price. If the till and the shelf draw on different systems, one will change before the other and there will be windows of mismatch. The page on shelf price versus till price covers what happens when a customer is charged more than advertised.
• Scheduling versus live changes. Many campaigns load overnight. Intraday changes are possible; decide which categories allow them.
• The dynamic pricing noise. Changing a price often is not unlawful in itself, and a label does not change a price on its own. The debate is summarised on the dynamic pricing page.

What chains have actually done

We found no sourced 2026 count for UK or Irish grocers, so the figures below are the documented ones we have, from Spain. They show the scale people work at.

Chain	What was published	Date
Alcampo	560,000 Hanshow labels in 84 supermarkets, with HL Display’s Slimline system; 3.8 million euros invested in the year; ambient, fresh and frozen	1 Sep 2026
El Jamón (Huelva)	Close to 3 million Hanshow labels, first phase in about 100 supermarkets, whole network over three years	27 Aug 2026
Consum	Over 322,000 labels in more than 500 stores, about 640 per store, over 7.9 million euros in phases; started at the fish counter and bakery; supplier not named	29 Jul 2026
Carrefour	Three-year renewal of Pricer as exclusive supplier in France, Spain, Belgium, Italy, Romania and Poland; no volume commitment, no store count	2 May 2023

All figures come from the trade press cited and the companies’ own announcements, not from audits. Some careful readings:

• Order of magnitude. Alcampo averages about 6,700 labels per store and Consum about 640. Dividing labels by stores gives an average, not a project figure; format, range size and the departments covered explain the gap. On Alcampo’s numbers the investment is about 6.8 euros per label, an approximation and not a unit price, since the investment may include installation and software that the announcement does not itemise.
• Start where it hurts. Consum began with fish and bakery, where the price moves by kilo and by batch, and expanded from there.
• Environmental claim. Alcampo says it will avoid 1,843 km of paper strips and 8.4 tonnes of CO2. That is its own figure, with no published method.
• Not confirmed. Press reports of Lidl trials in Spain and of other chains lack a primary source, so we left them out.

Market data and vendors live elsewhere: see the vendor comparison.

What it costs and how to evaluate it

The only public price in this sector is Alcampo’s, and it measures a total investment, not a label. For your own comparison you need four things: labels per store (fresh only, or the whole floor), the model mix (standard, large for counters, cold), the infrastructure (gateways, network) and the cost of integrating with your pricing system and your scales.

Return studies quoted in the press, such as the Forrester one commissioned by Pricer, assume a 500-store model, come from a vendor and rest on time saved per manual change. They help you order the line items, not set your figure. Run your own numbers in the total cost calculator.

Six questions before you start

1. Which system does the price come from, and how does it reach label, scale and till?
2. Which departments go first, and where does the price change daily?
3. Which label families do I need for ambient, chilled, frozen and counter?
4. How do I keep price history to prove the 30-day reference price?
5. Who decides expiry markdowns, at what time and within what limit?
6. How will I measure the result against a store without labels?

Smaller formats, such as convenience and franchised stores, are a different case, covered on the convenience page. All sectors are on the sector index.

Limits of this page

We have not reviewed contracts or installations. Legal citations follow the texts consulted on 9 November 2026 and are not legal advice. Chain figures are what the chains gave the press. This site is published by Keonex, as we explain on the about page.