Nevada Greenhouse Gas Inventory and Reference Case Projections

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FINAL Nevada GHG Inventory and Reference Case Projection CCS, July 2007 Acknowledgements We appreciate all of the time and assistance provided by numerous contacts throughout Nevada, as well as in neighboring states, and at federal agencies. Thanks go to in particular the many staff at several Nevada state agencies for their inputs, and in particular to Jennifer Carr, Sigurd Juanarajs, Jean-Paul Huys, Frank Forsgren, Dave Simpson, and the peer review staff of the Nevada Division of Environmental Protection (NDEP) who provided key guidance for this analytical effort. Nevada Division of xii Center for Climate Strategies Environmental Protection www.climatestrategies.us
Summary of Preliminary Findings Introduction FINAL Nevada GHG Inventory and Reference Case Projection CCS, July 2007 The Center for Climate Strategies prepared this report for the Nevada Department of Conservation and Natural Resources, Division of Environmental Protection (NDEP) under contract to the Western Regional Air Partnership (WRAP). This report presents initial estimates of base year and projected Nevada anthropogenic greenhouse gas (GHG) emissions and sinks for the period from 1990 to 2020. These estimates are intended to assist the State with an initial, comprehensive understanding of current and possible future GHG emissions for Nevada. Historical GHG emission estimates (1990 through 2005) 2 were developed using a set of generally accepted principles and guidelines for state GHG emissions inventories, as described in Section 2, relying to the extent possible on Nevada-specific data and inputs. The initial reference case projections (2006-2020) are based on a compilation of various existing projections of electricity generation, fuel use, and other GHG-emitting activities, along with a set of simple, transparent assumptions described in the appendices of this report. This report covers the six gases included in the U.S. Greenhouse Gas Inventory: carbon dioxide (CO 2 ), methane (CH 4 ), nitrous oxide (N 2 O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF 6 ). Emissions of these GHGs are presented using a common metric, CO 2 equivalence (CO 2 e), which indicates the relative contribution of each gas to global average radiative forcing on a Global Warming Potential- (GWP-) weighted basis. As stated in the Executive Summary, CCS also added emission estimates for black carbon (BC) based on 2002 and 2018 data from the WRAP. Black carbon is an aerosol species with a positive climate forcing potential (i.e., the potential to warm the atmosphere, as GHGs do). It is important to note that the emissions estimates reflect the GHG emissions associated with the electricity sources used to meet Nevada’s demands, corresponding to a consumption-based approach to emissions accounting (see Approach Section below). Another way to look at electricity emissions is to consider the GHG emissions produced by electricity generation facilities in the State. This report covers both methods of accounting for emissions, but for consistency, all total results are reported as consumption-based. 2 The last year of available historical data varies by sector; ranging from 2000 to 2005. Nevada Division of 1 Center for Climate Strategies Environmental Protection www.climatestrategies.us
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