Driven by a sharply falling cost price and a rising demand for low-carbon electricity, the share of renewable energy in the energy mix has increased enormously in the last decade, including in Belgium. However, renewable energy is intermittent, which poses both technical and economic challenges. There is an increasing need for flexibility in both consumption and production of electricity to keep the system stable. This thesis examines the extent to which a number of technologies can contribute to this, based on a unique techno-economic framework that analyzes the economic side in addition to technical feasibility.