It might be important to implement higher cost options together with lower cost options, if the deployment of the former has the potential to reduce the longer-term costs of mitigation. These include 1) a contribution to increased energy security, reduced dependence from imported fossil fuels; 2) hedging against price volatility and long-term price increase of fossil fuels; 3) a contribution to the reduction of other pollutants and related risks arising from the use of other energy sources; 4) and a willingness to develop local employment, sometimes reinforced by a perception of the first mover's advantage. When it comes to overlapping C02 and RE policies, the additional cost imposed on the achievement of the C02 target by the RE policy instrument might be simply considered the cost of reaching the other objectives pursued by this policy instrument.