High-quality televisions are becoming more common in households around the world, but their costs are starting to rise significantly. Ultra High Definition TVs, also called 4K, offer images that are four times more detailed than the standard high-definition screens we’re familiar with. However, the latest 4K models use about 30% more energy than regular HD TVs, according to a report from the Natural Resources Defense Council. The report also noted that if all TVs larger than 36 inches in the US were to switch to 4K with the current average efficiency, domestic energy bills could go up by more than $1 billion each year.