Cookies are small widely used files or devices that are installed on the user's browser to store, retrieve or update data. They enable a website administrator to record the user's preferences when browsing the website and customise the services offered based on those preferences.

At www.iberdrola.com we use own and third-party cookies for usage analysis and measurement purposes to make sure that our websites are working properly and enable us to improve our services.

The third-party cookies we use on Iberdrola to obtain information on visits, measure and analyse browsing habits on the website, and customise some services are owned by Google Universal Analytics and Investis. Google Universal Analytics and Investis both have access to the data gathered by their devices.

Web beacons are similar technologies that are also installed on the user's browser for different purposes. They are small graphic images (also called “pixel tags” or “clear GIFs”) that can be included on websites or in services, apps, messages and tools. At www.iberdrola.com we only use our own web beacons to monitor traffic.


Depending on their purpose, cookies can be:

  • Technical cookies: these are needed for browsing. Without them the website would not work properly ("user input" cookies for online shopping baskets, multimedia player session cookies, etc.).
  • Customisation or configuration cookies: these enable the web page to recognise the user's language, the font size, etc.
  • Security cookies: these prevent or hinder attacks against the website or its users.
  • Analysis cookies: these enable user activity to be measured and browsing statistics to be compiled.
  • Advertising cookies: these manage the frequency and content of the ads.
  • Behavioural advertising cookies: these store information on the users to display customised advertising.


If you would like to delete the cookies and web beacons that are already installed on your terminal, you can do so from your browser. You can find instructions on how to do so in your browser's help menu, where the steps for deleting them are explained. For further information:

Internet Explorer


Mozilla Firefox


Google Chrome





There are different types of cookies on our website and they are used for different purposes. The various cookies we use are listed below.

Own cookies

JSESSIONID: cookies that identify the user session. It has a duration of 3,000 milliseconds.

leyCookies: this is generated for all users who accept the Iberdrola cookie policy. It has a duration of one year.

CSRF: technical cookie to verify that the requests to the server stem from a legitimate user who wishes to make the request at that time. It has a duration of one hour.

Third-party cookies


The Investis tools used in www.iberdrola.com use cookies to detect user preferences and display personalised content. These cookies do not gather any personal identification details. The cookies used by Investis are:

  • Asp.net SessionID


_ga: uses an anonymous identifier to distinguish anonymous users and perform analyses on user interactions in the application to optimise the services offered. It has a duration of two years.

_gat: used to differentiate between different tracking objects created during the session. It has a duration of 10 minutes.

For more information on the data that Google Analytics collects through its cookies and the use made thereof, please refer to the Google Analytics Data Protection website.


_ceir, is_returning: uses an anonymous identifier to track whether a visitor has visited the site before. It has a duration of five years.

_ceg.s, s: uses an anonymous identifier to track visitor's sessions. It has a duration of three months.

_ceg.u, u: uses an anonymous identifier to track users. It has a duration of three months.

cer.s: uses an anonymous identifier to track visitor activity tracking host and start time. Expires where the browser is shut down.

cer.v: uses an anonymous identifier to track visit time and visit count. Expires at the end of every month.


The employment portal www.careers.iberdrola.com uses cookies to detect the preferences of users in order to present personalized content and improve user experience. The only cookie used by SAP SUCCESSFACTORS is:

JSESSIONID: single cookie placed on the user device during their session so the server can identify the user. Created as a session cookie whenever a new user visits a RMK site. The value is not updated unless the current session ends, in which case a completely new JSESSIONID cookie is set.


All the information and documentation available in the English version of this website is provided for information purposes only. In the event of a discrepancy between the content of the English and Spanish, the latter shall take precedence.