Further, the IRS or other tax authorities could challenge one or more tax positions NEP or NEP OpCo takes, such as the classification of assets under the income tax depreciation rules, the characterization of expenses (including, but not limited to, NEP's share of the IDR fee) for income tax purposes, the extent to which sales, use or goods and services tax applies to operations in a particular state or the availability of property tax exemptions with respect to NEP's projects.