The personal data we handle come from various sources: From yourself, when you order our services, fill in contact forms or send us your personal details. On these occasions we notify you of the data we require and need in order to provide you with the service in question. From our relationship to you as customer, like energy consumption data, processing of work orders, equipment details or behaviour data. From public sources, like public address registers or third parties with which we collaborate, such as credit data providers, debt collection services, installation partners and marketing partners.