Technologies that burn municipal solid waste (MSW) with energy recovery have come a long way in the past 100 years. Although the last new MSW-processing waste-to-energy (WTE) facilities constructed in the United States commenced operations in 1996, recent years have witnessed a renaissance of interest and activity, some of it in traditional mass-burn combustion but more in new conversion technologies. This presentation will provide an update on these renewable energy technologies and highlight several projects under development.