Department of Energy Energy Information Administration (EIA)
The EIA is a very extensive source for data on energy consumption in the United States, with both annual and monthly data available. The EIA also has a collection of "navigators" with additional data on various categories of energy, such as the Petroleum Navigator that includes national and state-level data on prices, production, and consumption. The EIA also has much state-level and international data available.
Environmental Protection Agency (EPA)
In addition to its regulatory duties and functions, the EPA also provides access to various data collections and tools such as the Toxic Release Inventory, which monitors releases and management of toxic chemicals from industrial facilities, and the State and Local Climate and Energy Program, which provides resources to state and local governments in addressing climate change-related issues. The EPA also provides Envirofacts for summary statistics by state and local areas and a catalog of "raw" (i.e. large) data files.