This is the third report in a series of reports about the energy systems in the Baltic countries: Estonia, Latvia and Lithuania from the project ``Baltic-Nordic cooperation in the field of energy and environment`` financed by the Energy Market Group under the Nordic Council of Ministers. The present report tries to illustrate the potentials for energy conservation in Lithuania and Latvia. For Lithuania the material is based on the ``National energy efficiency programme``, which was prepared in 1991. It documents that the energy conservation potentials are large, especially in the heating sector. It includes the views of the Lithuantan specialists of the best measures and strategic directions to restructure the energy system. For Latvia similar material is not available but will be developed in the tasks described in the National Energy Saving Strategy which the Government has established. This strategy is described and thoughts about future developments had to be based on energy projections from 1990 which although they are rather high still reflects some of the future possibilities including a calculation of the energy saving potentials also made in 1990. The section about Latvia also contain chapters of the wood, straw and peat resources. (au) (19 tabs., 18 ills.).