Costs Commerce 6 Cost benefit analysis 5 Life cycle 4 Optimisations 4 Cost accounting 3 Economics 3 Electric power transmission networks 3 Investments 3 Optimization 3 Stochastic systems 3 Uncertainty 3 Budget control 2 Competition 2 Construction industry 2 Construction projects 2 Cost-benefit analysis 2 Decision making 2 Energy resources 2 Forecasting 2 Heuristic algorithms 2 Integer programming 2 Natural gas 2 Random processes 2 Renewable energies 2 Renewable energy 2 Renewable energy resources 2 Risk assessment 2 Solar cells 2 Urban transportation 2