when Aquila Energy structured a dual-commodity hedge for Consolidated Edison (ConEd). The transaction involved ConEd's purchase of electric power from Aquila for the month of August. The price of the power was agreed, and a weather clause was embedded into the contract. This clause stipulated that Aquila would pay ConEd a rebate if August turned out to be cooler than expected. The measurement of this was referenced to Cooling Degree Days (CDDs) measured at New York City's Central Park weather station. If total CDDs were from 0 to 10% below the expected 320, the company received no discount to the power price, but if total CDDs were 11 to 20% below normal, ConEd would receive a $16,000 discount. Other discounted levels were worked in for even greater departures from normal. Weather derivatives slowly began trading over-the-counter in 1997. As the market for these products grew, the Chicago Mercantile Exchange (CME) introduced the first exchange-traded weather futures contracts (and corresponding options), in 1999. The CME currently lists weather derivative contracts for 24 cities in the United States, eleven in Europe, six in Canada, three in Australia and three in Japan. Most of these financial instruments track cooling degree days or heating degree days, but other products track snowfall and rainfall in at ten separate U.S. locations. The CME Hurricane Index, an innovation developed by the reinsurance industry provides contracts that are based on a formula derived from the wind speed and radius of named storms at the point of U.S. landfall. Enron Corporation was one of the first to explore weather derivatives, through its EnronOnline unit. In an Opalesque video interview, Nephila Capital's Barney Schauble described how some hedge funds treat weather derivatives as an investment class. Counterparties such as utilities, farming conglomerates, individual companies and insurance companies are essentially looking to hedge their exposure through weather derivatives, and funds have become a sophisticated partner in providing this protection. There has also been a shift over the last few years from primarily fund of funds investment in weather risk, to more direct investment for investors looking for non-correlated items for their portfolio. Weather derivatives provide a pure non-correlated alternative to traditional financial markets. An online weather derivative exchange Massive Rainfall was created in 2014 and has been used to bet or hedge on specific temperatures, wind speeds and rainfall for specific days in select cities, however it appears to be only