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Independent assurance report

To the Board of Management of Wärtsilä Oyj Abp

We have been engaged by the Board of Management of Wärtsilä Oyj Abp (hereafter: Wärtsilä) to provide limited assurance on Wärtsilä's Sustainability Information from the reporting period 1.1.-31.12.2010 presented in connection with the electronic Wärtsilä Annual Report 2010 (hereafter: the Report).

The information subject to the limited assurance engagement (hereafter: the Sustainability Information) includes the data and assertions presented in the "Sustainability" -section and its sub-sections in the Report, as well as the following sub-sections of the "Business" section: "Ship Power and Sustainability", "Power Plants and Sustainability", and "Services and Sustainability". The Sustainability Information also includes data and assertions on product sustainability performance presented on selected and marked pages at

The Board of Management of Wärtsilä is responsible for the presented Sustainability Information as well as for preparing and presenting the Sustainability Information in accordance with the Global Reporting Initiative (GRI) Sustainability Reporting Guidelines 3.0 (G3). The Board of Management of Wärtsilä has approved the presented Sustainability Information.

Our responsibility is to carry out a limited assurance engagement and to express a conclusion on the Sustainability Information subject to the assurance based on the work performed. We have conducted the engagement in accordance with the International Standard on Assurance Engagements (ISAE 3000): Assurance engagements other than audits or review of historical financial information, issued by the International Auditing and Assurance Standards Board. Amongst others, this standard requires that the assuring party possesses the specific knowledge, skills and professional competence needed to understand and review the information to be assured, and that the assuring party complies with the requirements of the IFAC Code of Ethics for Professional Accountants to ensure their independence.

The evaluation criteria used for our assurance are the Global Reporting Initiative (GRI) Sustainability Reporting Guidelines 3.0 (G3).

Limitations of the engagement

Sustainability related data and information are subject to inherent limitations applying to data accuracy and completeness, which are to be taken into account when reading our assurance report. The presented Sustainability Information is to be considered in connection with the explanatory information on data collection, consolidation and assessments provided by Wärtsilä. Our assurance report is not intended for use in evaluating Wärtsilä's performance in executing the sustainability principles Wärtsilä has defined. To assess the financial state and performance of Wärtsilä, the Wärtsilä audited Financial Statements for the year ended 31 December 2010 is to be consulted.

The work performed in the engagement

Our assurance procedures are designed to obtain limited assurance on whether the information subject to the assurance engagement is presented in accordance with the Sustainability Reporting Guidelines of the Global Reporting Initiative 3.0 (G3) in all material respects. A limited assurance engagement consists of making inquiries, primarily of persons responsible for the preparation of the sustainability information presented, and applying analytical and other evidence gathering procedures, as appropriate. The evidence gathering procedures mentioned above are more limited than for a reasonable assurance engagement, and therefore less assurance is obtained than in a reasonable assurance engagement.

In our engagement we have performed the following procedures:

  • Interviews with two members of senior management to reassert our understanding of the connection between Wärtsilä's sustainability procedures and Wärtsilä's business strategy and operations as well as sustainability objectives;
  • An assessment of data management processes, information systems and working methods used to gather and consolidate the presented Sustainability Information, and a review of Wärtsilä's related internal documents;
  • Comparison of Sustainability Information to underlying rules of procedure, management and reporting systems as well as documentation;
  • An assessment of the presented Sustainability Information against the GRI reporting principles;
  • A review of the presented Sustainability Information, including the performance data and assertions, subject to the engagement, and an assessment of information quality and reporting boundary definitions;
  • Testing of data accuracy and completeness through samples from the Group's information systems and original numerical information received from Wärtsilä's subsidiaries;
  • Visits to three Wärtsilä sites selected on the basis of a risk analysis taking into account both qualitative and quantitative information, and a video conference to one additional site.


Based on the assurance procedures performed, nothing has come to our attention that causes us to believe that the information subject to the assurance engagement is not presented in accordance with the Sustainability Reporting Guidelines of the Global Reporting Initiative 3.0 (G3) in all material respects.

Helsinki, 7. February 2011


Pekka Pajamo                                                              Nina Killström
Authorized Public Accountant                                   Corporate Responsibility Advisor