Current incentive scheme addressed to RES investors based on tradable certificates of originwhereby renewable energy producers receive: (a) price for electricity sold at competitive market (current market price equal to approx. EUR 40-42/MWh) as well as (b) price for tradable certificates of origin purchased in particular by suppliers selling electricity to final consumers. The foregoing incentive scheme operates so that market price for certificates may not exceed in practice the so-called “substitute fee” which is an alternative method of fulfillment of the obligation to obtain and redeem certificates of origin. Such substitute fee is currently equal to EUR 71,5/MWh which operates as a cap for market price of certificates. However, current market price for certificates fell in May 2015 to approx. EUR 30/MWh).