This Technical Report on "Climate Change and Energy Supply and Use" has been prepared for the U.S. Department of Energy by the Oak Ridge National Laboratory in support of the U.S. National Climate Assessment (NCA). Prepared on an accelerated schedule to fit time requirements for the NCA, it is a summary of the currently existing knowledge base on its topic, nested within a broader framing of issues and questions that need further attention in the longer run. This technical input report is a summary of the currently existing knowledge base on climate change and energy supply and use, nested within a broader framing of the issues and questions that need further attention in the longer run. It builds on two previous assessments of implications of climate change for energy supply and use. The report summarizes current knowledge, especially emerging findings since 2007, about implications of climate change for energy use, implications of climate change for energy production and supply (oil and gas, thermal electricity, renewable energy, integrated perspectives, and indirect impacts on energy systems), followed by discussions of implications for future risk management strategies, research gaps, and moving toward a self-sustained continuing assessment capacity for the longer term.