Traditional finance theory characterizes investments by their risk and their return. High risk investments, such as junk bonds, have to...

Some nuclear power news: PG&E is shutting down the Diablo Canyon nuclear power plant, the last plant in California. Their decision is not...

Electric vehicles will continue to gain popularity for the same reason as rooftop solar – the economics keep improving. Batteries (mass...

We celebrated a milestone recently. Over one million homeowners have solar. It took 62 years, from 1954 to 2016, to get to this point....

If you have a rooftop solar system, you already know that it requires very little maintenance. But “low” maintenance doesn’t mean “no”...

How many solar panels will fit on my roof? How can you tell if a solar salesperson is exaggerating? Will a big solar company be more...

Things have been changing pretty quickly in the light bulb business. In the course of a few short years, Edison’s filament bulbs have...

You can generate your own power on your home or business roof for about $0.07/kwh, with paybacks in the 4-8 year range. Without a doubt,...

Last month was the 30th anniversary of Chernobyl. The meltdown at this Soviet plant was the worst nuclear power disaster in history. It...

Battery storage systems have made enormous strides in terms of cost and efficiency. Unfortunately, our society’s needs keep increasing —...

Lower costs trends in the solar industry are creating a boom. At the end of 2015 there were over 200,000 people employed in the industry,...

When I first got into solar, Florida seemed to be a natural market. After all, it’s the sunshine state. In spite of the sun, there is one...

Just as a grimey window does not transmit as much light as one that’s sparkling clean, dirty solar panels will not produce as much energy...

The economics for rooftop solar are terrific — typical paybacks in the 4-10 year range. From a Return on Investment (ROI) standpoint,...

Computer devices used 66 watts: printer, cable modem, multiple wireless routers, laptop charger, mini-speaker Communications used 16...

The sun is shining brightly on your rooftop solar system (or the system you hope to have). But how can you tell if those photons falling...

According to a recent GTM/SEIA study, residential solar installation costs in the U.S. were basically unchanged from Q4 2014 to Q4 2015....

Most of my rooftop solar customers express a preference for buying U.S. made solar panels. And they were willing to pay a premium for...

Our society’s energy generation transition from wood to coal to oil to gas has been steady and obvious. Now we are benefiting from the...

For a homeowner, determining how many solar panels you need is a simple question. But in order to answer the question accurately, solar...