CTA, NCTA extend voluntary STB efficiency agreement Details Michelle Clancy | 18 March 2018 The Consumer Technology Association (CTA) and the Internet & Television Association (NCTA) in the US have announced a four-year extension of the award-winning Voluntary Agreement for Ongoing Improvement to the Energy Efficiency of Set-Top Boxes, initially signed in 2012. The extended agreement is expected to save consumers $1.6 billion in energy costs and avoid 9.3 million metric tons of carbon dioxide (CO2) emissions each year, once the benefits of the agreement