Solar thermal

The difference between diffuse and concentrated energy sources, the theme of last week's Archdruid Report post, means that some of today's highly touted alternative energy schemes may be worth much less than currently claimed, while other technologies that receive much less attention may be the wave of the future. A closer consideration of energy concentration and its effects helps clarify which is which.

Solar thermal is a way of harnessing the largest source of energy available to us, so in this post I'll have a look at the upswing in interest in the use of this technology for electricity generation in recent years and look at some of the approaches being pursued to make it economically competitive with coal fired power generation.

A great deal of discussion of renewable energy these days focuses on massive, centralized projects, relying on habits of thought we inherit from the departing age of cheap abundant energy. With the aid of two inventors and a glass of brandy, the Archdruid explains why thermodynamics suggests a radically different approach.

One of the least understood dimensions of the crisis of industrial society is the role of energy concentration, rather than the simple quantity of energy, in making the modern world possible. Renewable energy sources have much lower concentrations than fossil fuels, and that distinction can have critical impacts on what can and can't be done with them -- a lesson easily learnt from one of the few really mature renewable energy technologies we have at present.

Millions of job losses are pushing the U.S. Senate to consider a Jobs and Energy bill, even though Cap and Trade appears to be on life support. What are Five Key Measures that must be in a new Bill to avoid being a "half-ass..d" effort? (term from Sen. Lindsey Graham descrbing limited climate bill)

"as mankind proceeded to get bigger and bigger we silently crossed a threshold"

Evolution demands short-term thinking focused on individual survival. Most attempts to overcome our evolutionarily hardwired absorption with self are selected against. The Overman is dead, killed by a high-fat diet and unwillingness to exercise. Reflexively, we follow him into the grave.

San Antonio's new Mayor Julian Castro, in office just three months, has inherited a dilemma. The nation's 7th largest city is suffering from almost 8% unemployment. With limited resources, the Mayor and City Council are searching for ways to create local jobs. At the same time, the City, through its municipal utility City Public Service (CPS), is burning through hundreds of millions of dollars on just paperwork, to prepare to spend billions on a new nuclear power plant project some 200 miles away at Bay City, TX.

For decades the "Holy Grail" of the New Energy Economy has been to find ways to store wind and solar energy. The answers are here, and they are much more plain and simple than we thought. Like Indiana Jones in his Last Crusade, we need to see the Grail that is right before our eyes. The means to enable solar and wind energy to serve as our primary energy supplies are at hand.

Although the SW sunshine resource is enormous and largely untapped, critics of solar energy routinely note the sun does not shine all the time. The implication is that power is needed all the time, and since the sun is not always available, solar opponents say it would be foolish to invest in generating electricity from the sun.

Just a year and a half after a breakthrough Solar Grand Plan study was published in the January 2008 Scientific American, the U.S. government has begun plans to implement major elements of such a Plan.

Message to Washington: You're not getting it - we're still out of work. WInd farms and energy efficient public buildings are important, but what about the housing industry? The recession started with the housing industry -- and can end if we bring back construction -- so lets focus on the real problem. That's the heart of the message to Congress and the Obama administration from a group of architects and builders who are promoting a plan to end the recession by revitalizing America's

Why Obama Should Take Notes from Cuba on a Green Energy Revolution
Solar Carbon Payback
Resourceful Guy Builds Solar House, Solar Power, Solar Car

Bringing efficiency to the infrastructure
Military embraces green energy
A potential breakthrough in harnessing the sun’s energy
The cost of wind, the price of wind, the value of wind

This content is no longer available. It was a pre-publication draft of a section of "Energy Limits to Growth," a report that will be published in expanded form by Post Carbon Institute and International Forum on globalization in May.