Inesco Oy was established in 2001 by PEMF and Electrowatt-Ekono Ltd (50/50). The business concept of Inesco was to identify, design, implement and finance energy efficiency and saving investments, targeted especially to industrial clients, e.g. pulp and paper, chemical and steel industry.

As the Managing Director of PEMF, Mr. Lehdonvirta was responsible to develop and implement the business concept and company structure of Inesco. This included technical, financial and environmental feasibility, financial modeling and the founding documentation. After the company establishment, Mr. Lehdonvirta participated as a Board Member in hiring the key personnel and in establishing the key business procedures based on ESCO principle, including the structuring of project identification, sales, technical design processes, due diligence and commercial contracts for project delivery. PEMF exit in 2007.