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Investment in electricity capacity under fuel cost uncertainty: Dual-fuel and a mix of single-fuel technologies

机译:燃料成本不确定性下的电力投资:双燃料和单燃料技术的混合

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We study the effect of the price and price volatility of natural gas on investment in electricity capacity in two technology scenarios: (1) dual-fuel units that use natural gas and diesel; and (2) a mix of single-fuel plants that use coal or natural gas. We develop a two-stage (capacity and operation) model and derive analytical solutions for both scenarios. Based on the observed log-normal distribution of the natural gas price, we show that optimal capacity investment increases moderately with natural gas price volatility, countering a commonly held view that fuel cost uncertainty tends to discourage capacity investment. Thus, higher volatility of the natural gas price tends to reduce the 'missing money' problem. We use Texas data to show that higher gas price volatility implies higher profits and consumer surplus in the first scenario, even when the per MWh diesel cost is much higher than the expected value of the per MWh gas cost. In the second scenario, firms invest only in gas capacity, unless the per MWh coal cost is significantly below the expected per MWh gas cost, thus explaining the popularity of gas generation.
机译:我们在两种技术情景下研究天然气价格和价格波动对电力投资的影响:(1)使用天然气和柴油的双燃料装置; (2)混合使用煤炭或天然气的单燃料电厂。我们开发了一个两阶段(容量和运营)模型,并针对这两种情况得出了解析解决方案。基于观察到的天然气价格的对数正态分布,我们表明,随着天然气价格的波动,最优容量投资会适度增加,这与人们普遍认为的燃料成本不确定性会阻碍容量投资的观点相反。因此,天然气价格的较高波动性倾向于减少“资金短缺”的问题。我们使用德克萨斯州的数据表明,在第一种情况下,即使每兆瓦时柴油成本远高于每兆瓦时天然气成本的预期值,较高的汽油价格波动也意味着更高的利润和消费者剩余。在第二种情况下,除非每兆瓦时的煤炭成本大大低于预期的每兆瓦时的天然气成本,否则企业仅投资于天然气产能,因此可以解释天然气生产的普及。

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