Solar and wind producers are asking Prime Minister Shmygal to use state budget money to pay bills that could top $1 billion by the end of this year. Under a law that went into effect Aug. 1, the government commits to keep current on the new, reduced green tariffs and to pay 40% of the backlog by the end of this year. The remaining 60% is to be paid next year. In a letter signed yesterday by producer groups, the government was $800 million behind on August 1st. Now, the Guaranteed Buyer, or GarPok, predicts it will have trouble paying $350 million more by the end of this year. The letter was signed by the European-Ukrainian Energy Agency, the Ukrainian Wind Energy Association and the Ukrainian Renewable Energy Association.