Helpful information

What are cookies?

Cookies are small text files that are saved to your computer. npower uses cookies to remember users during a visit, upon return to the site and are required to enable certain functionality. In addition, cookies are used to help us understand how our customers use our websites and we use this information to help plan improvements to the site and to enable us to get to know you better. For example, using Persistent cookies allows us to recognise you when you return to the site, identify your preferences so as to provide you with a more personalised service and speed up searches that you conduct when visiting. npower does not use cookies to collect or store personally identifiable information about you.

A new EU Directive (2009/136/EC) came into force on 26 May 2011, changing the way in which websites use cookies and gain consent from users. We are currently working on ways in which our website will be updated to support these new rules. Below are details of how we currently use cookies, with details of how you can manage their use.

How to control the use of cookies

If you wish to restrict or block the use of cookies on your computer when you visit any npower website, you can do this through your browser settings. The "Help" function within your browser should give details of how to manage cookies and how to delete cookies already on your computer.

Some functionality on npower websites may not work when viewed with your browser set to have cookies disabled. In particular, you will not be able to complete product purchases or manage your account

For further information on cookies and how you can control how these are used, you can visit www.allaboutcookies.org.

How npower uses cookies

Both npower and third parties make use of cookies when you visit our websites. The following is a description of the types of cookie that are used, why they are used and details of the individual cookies:


Session cookies are used by us to recognise a user throughout a visit. This enables us to remember information that you have entered, for example, the product you have selected during a purchase which can then be used at each stage of processing your purchase. Session cookies are also used to remember you when you log in for the duration of your visit.

  • npower.com: ASP.NET_SessionId



Persistent cookies allow us to retain information and settings about a user for more than one session. These cookies stay on a computer or a device until they expire or a user removes them. They enable us to recognise a user when they return to our site, identify their preferences so as to provide a user with a more personalised service and speed up searches a user conducts when visiting the site. They allow us to tailor marketing and servicing messages to users based on what we know users have or haven’t done in previous sessions. We are able to optimise the website for a user’s return to the site knowing whether they have previously bought something or whether they may need support to complete a service transaction.

Website Security cookies:

These cookies are  random keys used to prevent cross-site request forgery. These cookies expire 12months after being set on your device

  • CSRtoken


Cookies enable us to identify which type of advertising results in sales. This means that we are able to tailor our marketing more effectively. Also, where brokers and affiliates promote npower which then results in a sale, it enables them to identify which of their users has made a purchase on npower.com.

Marketing cookies

  • 360tag.com: t1 (session cookie): This is a cookie test, to see whether a user's browser accepts cookies
  • 360tag.com: tid (permanent cookie): UserID used to uniquely identify a user for the purposes of reporting and bid management
  • 360tag.com: sguid (session cookie): Used to identify the user's session
  • 360tag.com: 360lvs: (permanent cookie): Used to identify the users last traffic source
  • DFA Floodlight tags: Track user journey and conversion on website from online media
  • Criteo Tags: Track user journey on website and retarget them with display advertising
  • Dart Natural Search tag: Used to identify the users last traffic source

Website analytics:

Website analytics enables us to see how people use our website. This gives us the information to be able to make improvements, to make the site easier to use and based on the areas of the site people find most useful.

Website analytics cookies

  • npower.com: WT_FPC: Visitor identification, sessionization
  • npower.com: WT_DC: SmartView Transition Page Tracking
  • statse.webtrendslive.com: ACOOKIE: Visitor identification, sessionization

Website optimisation:

We test different versions of parts of the site before we finalise changes to ensure that any improvements make the site easier to use for our customers. Cookies help us to track how a user progresses through sections of the website that we are testing.

Website optimisation cookies

  • ots.optimize.webtrends.com: _wt.activeSplit: Identifies which Optimize split test the visitor is in
  • ots.optimize.webtrends.com: _wt.mode: Identifies what state the Optimize test/target is in (staging/active/complete).
  • ots.optimize.webtrends.com: _wt.user: Optimize test/target information, and Optimize visitor identifier
  • ots.optimize.webtrends.com: _wt.control: Optimize test/target information
  • ots.optimize.webtrends.com: _wt.conversion: Supports conversion event tracking in Optimize