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Abstract: The paper presents an investigation on the development of energy security level assessment technology. The system of energy security indicators, covering technical, economic and socio-political aspects, is introduced. The security indicator is a special index which gives numerical values to important issues for security of energy sector. In the paper, each indicator is described by presenting the title, comments, factual and threshold, pre-critical and critical state values. The integral characteristics of these indicators show the level of energy security and in order to identify it, a point system assessment scale is used. The methodology developed in this paper is applied for the assessment of the Lithuanian energy security level in different scenarios. At first, indicator groups are constructed and group weights are determined. The weights of indicators within each group are established in two ways: when all weights are equal and one indicator is dominating. Taking into consideration the assessment of indicators by points, their weights in groups and group weights, the Lithuanian energy security level was determined according to separate indicator blocks. The security level of each indicator and each indicator block, and total security level are presented as the results. The indicators that have the highest impact on the security level increase or decrease are determined as well. [Copyright &y& Elsevier]

• Detailed energy cost structures are integrated into a recursive dynamic CGE model. • Investment support and electricity import price changes are considered. • Consistent Lithuanian energy development scenarios are analysed. • Domestic electricity does not necessarily provide the net economic benefits. • The advantages of international cooperation are highlighted. The development of domestic energy generation is often expected to provide benefits to the economy through, for example, improved energy trade balance and jobs created. However, the economic impacts of energy development scenarios are not limited to the energy sector, and the decision makers must consider the impacts on the entire economy. In this paper, we analyse the full impacts of increased domestic electricity generation in a computable general equilibrium (CGE) framework. Realistic energy development scenarios are modelled using the MESSAGE energy system model and considered to be exogenously described energy pathways that generate responses from the remaining economy. These technically and economically consistent energy scenarios are incorporated into the computable general equilibrium model through the creation of fixed, variable, and investment cost structures for the energy forms considered. Model application in Lithuanian case revealed the interchangeable character of electricity imports and local generation based on a relatively significant share of imported resources. Depending on electricity market conditions, scenarios with higher domestic electricity generation levels might fail to provide substantial economic benefits: although increasing electricity import prices would create preconditions to increase domestic electricity production and turn Lithuania to the net electricity exporter, gross domestic product (GDP) might decrease due to the negative impacts on other economic activities. International cooperation for least-cost clean energy supply might be economically beneficial to energy importing countries and increasing domestic electricity generation should not be set as the ultimate goal. [ABSTRACT FROM AUTHOR]