And for a solar array, it’s about 25%. Nuclear is, by far, the most efficient energy source in the world. It’s also the cheapest. It costs an estimated $71 to generate one megawatt-hour of ...

But the performance can vary widely, even among hybrids. Below, we spotlight the 10 most fuel-efficient cars based on Consumer Reports’ overall fuel-economy test results.

Most hot tub manufacturers and dealers ... How do solar-powered hot tubs compare in terms of energy efficiency? Solar power is a great source of energy, but the amount of available sunlight ...

OK, we admit, we're a long way from a carbon-free grid—but when we have one, what's the most efficient way to use that energy to fly planes? This question is explored by an interactive tool ...

2024 — Trying to improve the efficiency of solar cells to become independent from fossil energy sources is a major goal of solar cell research. Physicists now combine perovskite with organic ...

Homeownership comes with its share of costs and one of the most common is utilities. Bankrate took a look at Americans' budgets and found we spend $380 on utilities on average each month, with the ...