In our case, there is a large variety of electricity packages that the consumer can choose from. Most of offered contracts are based on market based mix of generation sources, but there are also some which offer 100% renewable energy (price extra around 0.04 €/kWh). In addition, all customers are charged a fee for subsidising renewable generation.
What is the market situation in your case? Can you choose such package or you can only choose pricing (market, fixed, night & day..)? If this option is available, are you using it to support development of renewable generation units? If not, why are you not using this option?