<prompt> Translate the following text to EnglishMfano wa mabadiliko ya kiwango cha umeme ni kubwa ya benki ya kibali iliyopatikana kwa kupunguzwa mapema, inayotokana, kwa sehemu, na matumizi ya programu kabla ya kuanzishwa kwa mipaka; viwango tofauti vya mahitaji ya umeme kwa muda, na matokeo katika mabadiliko katika mchanganyiko wa jumla wa rasilimali za uzalishaji; na kupunguzwa kwa hatua kwa hatua katika kibali cha benki inayopatikana kwa uondoaji.  <response>: The generation expenditures vary in each of the scenarios change for at least three 1 the size of the allowance bank made possible by early reductions driven, in part, by program spending prior to the introduction of the caps; 2 the varying levels of demand for electricity over time, resulting in changes in the overall mix of generation resources; and, 3 the gradual reduction in the banked allowances available for withdrawal necessitating additional actions to reduce emissions. 