The U.N, World Summit on Environment and Development in Rio de Janeiro in June 1992 was the origin of the international framework for sustainable development. As a basis for joint, sustainable action by governments. organizations, industries, and the public, the participating Countries signed the Rio Declaration on Environment and Development, and drafted the associated action program, Agenda 21. Sustainable development comprises these three determinant factors: - Economy. - Ecology. -Social aspects. This is where entrepreneurial responsibility for society comes in. If industries want to generate overall positive effects, they must be efficient, competitive, and profitable on a long-term basis. Power supply systems meeting the criteria of sustainable development must be reliable. economically viable, socially acceptable, and environmentally compatible. The power supply in Finland is meeting these sustainability requirements in many waves. Finland's electricity supply is decentralize, using a variety of energy sources. Electricity can be generated and made available at low cost, The Finnish power industry is an important employer and a major factor in the economy, Moreover, electricity. is generated in advanced types of power plants. In this way, the structure of the Finnish power supply system incorporates important factors of sustainable development.