The document discusses repowering of wind turbines, which involves replacing older, smaller turbines with newer, larger turbines. It provides examples of repowering programs from Denmark and Germany. Denmark repowered around 2/3 of turbines under 100 kW capacity, replacing 1,480 turbines totaling 122 MW with 272 new turbines totaling 332 MW. Germany offers feed-in tariffs to encourage repowering projects that replace existing turbines from before 1995 and increase capacity by at least 3 times. Repowering results in fewer but higher efficiency turbines generating more power from the same land area.