rate base 费率基数；收益率基数

某些管理机构为公用事业公司等订立的，在计算投资收益率时使用的一种经济参数，只有该公司的总收入超过所订基数时才能获得特定的投资收益率。该种基数体现了该公司为提供规范服务所必须投入的且已投入的正在使用的财产或投资的公平市场价值。

Rate base is the value of property on which a public utility is permitted to earn a specified rate of return, in accordance with rules set by a regulatory agency. In general, the rate base consists of the value of property as used by the utility in providing service. It may be calculated by any one or a combination of accounting methods, such as fair value, prudent investment, reproduction cost, or original cost.

The rate base can include: cash, working capital, materials and supplies, deductions for accumulated provisions for depreciation, contributions in aid of construction, customer advances for construction, accumulated deferred income taxes, and accumulated deferred investment tax credits, all dependent on the method that is used in the calculation. 以下为相关例句：

例句1

An emerging question facing utility regulators in some states is whether cloud computing software should be included in rate bases. Conventional software, in which a company purchases and installs the program on hardware that it own, generally is included, but most regulators do not allow a rate of return on cloud software.

一些州的公用事业监管机构面临的一个新问题是，云计算软件是否应该纳入费率基数。传统软件通常包括在内，即公司购买并在自己的硬件上安装程序，但大多数监管机构不允许云软件的回报率。

例句2

In a period of static costs or no inflation, an original cost valuation may be sufficient. With a period of inflation, a rate base which values plant and equipment at original cost substantially undervalues the plant. In these circumstances, utilities argue in favor of reproduction-cost valuations. In either case, depreciation on plant and equipment is subtracted from the rate base and carried as an operating expense. The theory behind including depreciation as an expense is that capital may be accumulated for further expansion and growth.

在成本稳定或无通货膨胀的时期，原始成本估价可能就足够了。在通货膨胀时期，以原始成本估价厂房和设备的费率基数大大低估了厂房的价值。在这种情况下，公用事业公司赞成再生产成本估价。在这两种情况下，厂房和设备的折旧都要从费率基数中扣除，并作为经营费用入账。将折旧计入费用背后的理论是，资本可以积累起来用于进一步的扩张和增长。

例句3

A utility's rate base is essentially the company's “prudent” capital investment, as determined by the applicable regulatory authority’s net of accumulated depreciation. Stated differently, it is the net asset base from which the utility provides electric, gas or water service, and upon which the utility is allowed to earn a rate of return, usually the company's weighted average cost of capital. Thus, the rate base value is a key variable in the determination of a utility's revenue requirement.

公用事业的费率基数本质上是公司的“审慎”资本投资，由适用监管机构的累计折旧净值决定。换句话说，它是公用事业公司提供电、气或水服务的净资产基数，公用事业公司可以在此基础上赚取回报率，通常是公司的加权平均资本成本。因此，费率基值是确定公用事业收入要求的关键变量。

例句4

For vertically integrated electric utilities, rate base generally includes generation, transmission and distribution infrastructure; in restructured jurisdictions, the generation component is not included in the rate base calculation, as that service is competitively procured.

对于垂直整合的电力公司，费率基数通常包括发电、输电和配电基础设施；在重组后的管辖区，发电部分不包括在费率基数计算中，因为该服务是通过竞争采购的。