Discussion on woody biomass energy systems and natural ecosystem impacts: case study in Japan

Abstract

Energy from woody biomass is expected to revitalise industry in Japan and induce job creation in the region. Woody biomass power plants have been rapidly constructed all over the country after the Feed-in Tariff scheme began. However, there are increasing cases of the destruction of natural ecosystems and landscapes to fulfil the growing demand for woody biomass. This study aims to describe the ideal energy utilisation of woody biomass from the viewpoint of preserving natural ecosystems. First, a conceptual model for the positive and negative impact of woody biomass energy utilisation on the natural ecosystem was organised. Next, an online survey to collect information and data on woody biomass power plants and heat utilisation facilities in Japan was conducted. In addition, the positive and negative impacts of using woody biomass on economic, environmental, and social systems as well as ecosystems were discussed. An online survey showed that the annual fuel usage of the woody biomass and number of employees increase with the scale of the power plant. Although annual expenses also increase, this might be a positive impact, because it can contribute to the economy and employment of the region based on the increase in the production value. In contrast, a negative impact is that some woody biomass power plants import biomass fuel. Importing the biomass fuel is reasonable from the viewpoint of fuel supply cost reduction and stable supply. However, there might be negative impact on the local natural ecosystem when the woody biomass is not appropriately utilised.