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On December 5, 2006, the Commission voted 2-0 to issue an advance notice of proposed rulemaking (ANPRM) under the Consumer Product Safety Act (CPSA) concerning portable generators. The ANPRM discusses regulatory options that could reduce deaths and injuries related to portable generators, particularly those involving carbon monoxide (CO) poisoning. The ANPRM was published in the Federal Register on December 12, 2006. Staff reviewed public comments and conducted technical activities. In FY 2006, staff awarded a contract to develop a prototype generator engine with reduced CO in the exhaust. Also in FY 2006, staff entered into an interagency agreement (IAG) with the National Institute of Standards and Technology (NIST) to conduct tests with a generator, in both off-the-shelf and prototype configurations, operating in the garage attached to NIST's test house. NIST's test house, a double-wide manufactured home, is designed for conducting residential indoor air quality (IAQ) studies, and the scenarios tested are typical of those involving consumer fatalities. These tests provide empirical data on CO accumulation in the garage and infiltration into the house; staff used these data to evaluate the efficacy of the prototype in reducing the risk of fatal or severe CO poisoning. Under this IAG, NIST also modeled the CO infiltration from the garage under a variety of other conditions, including different ambient conditions and longer generator run times. In FY 2009, staff entered into a second IAG with NIST with the goal of developing CO emission performance requirements for a possible proposed regulation that would be based on health effects criteria. In 2011, staff prepared a package containing staff and contractor reports on the technology demonstration of the low CO emission prototype portable generator. This included, among other staff reports, a summary of the prototype development and durability results, as well as end-of-life emission test results performed on it by an independent emissions laboratory. Staff's assessment of the ability of the prototype to reduce the CO poisoning hazard was also included. In September 2012, staff released this package and solicited comments from stakeholders. Staff is reviewing the comments that were submitted in response to the release of the technology demonstration report. The technology demonstration of the low CO emission prototype portable generator and other staff activities on the portable generator project will be used in the development of a briefing package for use by the Commission to consider whether to issue a notice of proposed rulemaking (NPRM). Staff is scheduled to send an NPRM briefing package to the Commission in FY 2016.