results of operations of potential changes to the Adjustment Escalator.
          As stated above, the electricity sales concessions provide for an annual adjustment to the tariff, resulting in adjustments based on several factors including inflation increases as measured by different agreed upon indices. In certain situations, although not including Brazil, there is also an explicit linkage through the pricing provisions of the contract to a portion of the tariff that reflects changes, either entirely or in part, in exchange rates between the local currency and the U.S. Dollar. Such adjustments are made in arrears at various regular intervals, and in certain cases, requests for interim adjustments are permitted.
          If a foreign currency experiences a sudden or severe devaluation relative to the U.S. Dollar (the Company's reporting currency), such as occurred to the Brazilian Real in January 1999, because of the lack of direct adjustment to the then current exchange rate, the in arrears nature of the respective adjustment in the tariff or the potential delays or magnitude of the resulting local currency inflation of the tariff, the future results of operations of AES's distribution companies in that country could be adversely affected. Depending on the duration or severity of such devaluation, the future results of operations of AES may also be adversely affected. During 1999, the Brazilian Real experienced a significant devaluation relative to the U.S. Dollar, declining from 1.21 Brazilian Reais to the Dollar at December 31, 1998 to an average of 1.81 Reais to the Dollar for the year ended December 31, 1999.
          In Brazil, AES has interests in four distribution companies or integrated utilities (the Brazilian Businesses). These companies have long-term concession agreements which, although varying in term, have similar clauses providing for tariff adjustments based on certain specific events or circumstances. These adjustments occur annually (at different times) for each Brazilian Business and, in certain instances, in response to specific requests for adjustment. Adjustments to the tariff rates during the annual proceedings are designed to reflect, among others, (i) increases in the inflation rate as represented by a Brazilian inflation index (IGPM), and (ii) increases in specified operating costs (including purchased power costs), in each case as measured over the preceding twelve months. The specific tariff adjustment mechanism provides each Brazilian Business the option to request additional rate adjustments arising from significant events, such as the increase in cost of purchased power due to exchange rate variations, which disrupt the economic and financial equilibrium of such business. Other normal, or recurring, events are also included as a specific tariff increase and may include normal increases in purchased power costs, taxes on revenue generated or local inflation. The

Brazilian Business requesting relief has the burden to prove the impact on its financial or economic equilibrium, however, there can be no assurance that such adjustments will be granted. Each Brazilian Business intends to recover the specific rate adjustments pro- vided for in the concession agreements, and approximately $30 million of these costs (representing the Company's portion of such costs) that are expected to he recovered through future tariff increases were deferred In 1999.

1999 compared to 1998

Revenues. Revenues increased $855 million, or 36%, to $3.25 billion in 1999 from $2.40 billion in 1998. The increase in revenues is due primarily to the acquisition of both new generation and distribution businesses, as well as from the 'commercial operation of greenfield generation projects.
          Generation revenues increased $557 million, or 39%, to $1.97 billion in 1999 and accounted for 65% of the Company's total increase in revenues in 1999. New businesses acquired during 1999 that contributed significantly to the overall increase in generation revenues include certain of the New York plants, Drax and Panama. A full year of operations at Southland and Barry, as well as the acquisitions of Tiete and CILCORP in the fourth quarter of 1999 also contributed to the increase in generation revenues.
          Distribution revenues increased $298 million, or 30%, to $1.28 billion in 1999 and accounted for 35% of the Company's total increase in revenues in 1999. New businesses acquired during 1999 that contributed significantly to the overall increase in distribution revenues include NewEnergy, CILCORP and EDE Este. A full year of operations at Edelap also contributed to the increase in revenues. Distribution revenues were negatively impacted at Sul due to the effects of the devaluation of the Brazilian Real in early 1999.

Gross Margin. Gross margin, which represents total revenues reduced by cost of sales, increased $193 million, or 24%, to $1.00 billion in 1999 from $811 million in 1998. Gross margin as a percentage of revenues decreased to 31% in 1999 from 34% in 1998. The decrease in gross margin as a percentage of revenues is due to the decrease in the distribution gross margin.
          The generation gross margin increased $203 million, or 35%, to $779 million in 1999 from $576 million in 1998. The generation gross margin as a percentage of revenues remained fairly constant at 40% in 1999 and 41% in 1998.
          The distribution gross margin decreased $10 million, or 4%, to $225 million in 1999 from $235 million in 1998. The distribution gross margin as a percentage of revenues decreased to 18% in 1999

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