Availability means that information must be available when it is needed Low (A1) The disruption of access to or use of information will do no or very little harm to TenneT as a company, and no harm to the continuous and secure supply of electricity to society Medium (A2) The disruption of access to or use of information could clearly harm TenneT, but do no harm to the continuous and secure supply of electricity to society High (A3) The disruption of access to or use of information could do considerable harm to TenneT, but not directly to the continuous and secure supply of electricity to society Very High (A4) The disruption of access to or use of information could (very) seriously and acutely harm TenneT as a company and/or directly harm the continuous and secure supply of electricity to society