Since the start of the industrial revolution, our energy use has grown about 2.9 percent per year. This article says that to keep growing at even 2.3 percent per year beyond 275 years, we would have to put solar panels on every square meter of land.

Considering the sun’s energy seems limitless, what happens if we could maximize its use?

The article, from Energy Bulletin (July 12, 2011), is Part One of a series that tries to bring large concepts into view by using simple estimations to their logical, and sometimes humorous, conclusions.

Galactic-scale energy

…Surely in 275 years we will be smart enough to exceed 20% efficiency for such an important global resource. Let’s laugh in the face of thermodynamic limits and talk of 100% efficiency (yes, we have started the fantasy portion of this journey). This buys us a factor of five, or 70 years. But who needs the oceans? Let’s plaster them with 100% efficient solar panels as well.

Another 55 years. In 400 years, we hit the solar wall at the Earth’s surface. This is significant, because biomass, wind, and hydroelectric generation derive from the sun’s radiation, and fossil fuels represent the Earth’s battery charged by solar energy over millions of years. Only nuclear, geothermal, and tidal processes do not come from sunlight—the latter two of which are inconsequential for this analysis, at a few terawatts apiece…. Read the rest

Plant leaves are mini solar collectors. Can we convert the product of leaves’  work and convert that result into something that yields more usable energy than what the leaves manufactured in the first place? So far, we have not been very successful.

Most of the processes that involve biofuels have a low net energy result — energy-in versus energy-out. In fact, because there are fossil fuel inputs, there is a term that describes the result. It is called the “receding horizon.” The break-even point recedes into the horizon as fossil fuel prices rise.

While I am for using sun energy to help solve Hawai‘i’s food and fuel problem, I am also for emphasizing geothermal energy as a way to give Hawaii a game-changing energy/food/social advantage relative to the rest of the world. This is about positioning future generations for survival and prosperity all at once.

My Pop would say: Find three solutions for every problem and then find one more just in case. Now is the time to implement that special, geothermal solution.