The main policies and measures that strongly affected reduction of GHG emissions for the energy sector are the deployment of RES, energy efficiency measures and penetration of new technologies, peculiarly in Transport sector. Both the supply and demand sides are facing significant changes, part of the changes results from policy measures, part from technological development and development of the energy and fuel markets. As many of the changes involve or concern investments like power plants and heat boiler houses, the effects are robust and long lasting. In the WEM projection, the most significant future changes in electricity and heat production result from the start-up in the last three years both biomass CHP plants (with the total electric capacity of 25 MW) and biomass heat boiler plants and biomass heat boiler plants to be put into operation during next three years which replace the use of natural gas for heat production. In the WEM projection the total share of renewable energy sources in gross Final energy consumption in 2020 constitutes around 40% and increases up to around 42% in 2030. All these changes reduce emissions. In the WEM projection, Latvia remains a net importer of electricity during the projected period. Factors affecting the future energy demand are first of all energy efficiency measures, but also the economic development and structural changes within the industry.