If you were hoping that your new, energy-efficient TV might help save the planet (and your power bill), you're in for bad news. Natural Resources Defense Council, an environmental advocacy group, has published research showing that the US' energy ratings for TVs (such as EnergyGuide and Energy Star) don't line up with consumption in the real world. Tests on 2015 and 2016 sets from LG, Samsung and Vizio show that they use "up to twice" as much energy as claimed, often by turning off power-saving features with "little to no" warning. Some switch off the eco-friendly mode if you so much as change the picture settings, for example, while high dynamic range video will jack up the energy draw by 30 to 50 percent. Even the test footage used for government tests doesn't reflect the electricity you'd use in real-life viewing, the Council adds.