Jason Hall

Hayman Capital made NRG Energy its seventh-largest holding in the third quarter. Does founder Kyle Bass see NRG as a value play on a Solar industry where SolarCity and manufacturers like SunPower have exploded over the past year?

Westport Innovations has been a tough investment for many, with shares down more than 50% from March 2012's all-time high. What makes now any different?

Much noise was made following Berkshire Hathaway's investment in ExxonMobil last quarter, and for good reason. Is this company more like Buffett's own Berkshire than any other company he has invested in? It just may be.

Berkshire Hathaway founder and legendary investor Warren Buffett said "don't lose money" when it comes to investing. Berkshire subsidiary Mid-American Energy is heavily invested in renewable energy, especially wind and solar, working with partners like GE, Vestas, and SunPower to develop and install massive amounts of renewable energy. Should investors follow the Oracle's lead?

Berkshire Hathaway may have sold a large chunk of its stake in ConocoPhillips in the third quarter while buying a massive stake in ExxonMobil, but don't make the mistake of thinking that means Warren Buffett is bearish on ConocoPhillips -- especially since Berkshire still holds nearly $1 billion in the company's shares.

3D Systems and Stratasys have crushed the market this year. ExOne and Organovo have done even better, even with mister market's major sell-off the past few days. With tech giants like HP making noise about getting in 3D printing, is it time for investors to move on?

Kyle Bass, founder of Hayman Capital Management and famous subprime-mortgage short expert, made some interesting buys in the third quarter. Here are a couple that aren't real-estate-related and one that is more up his alley -- in a contrarian way.

Natural gas vehicles aren't new, but their presence in North America has been minimal outside of the growing fleets of waste removal and municipal buses for the past several years. A big part of the problem for many people is limited range, and access to fuel. These three companies are doing something to change that.

Knowing your strengths is important, but knowing what the market wants is even more important.

Clean Energy Fuels and UPS are investing heavily in commercial natural gas vehicles . GE's in the game, too -- as are Ford and General Motors. But will consumers give compressed natural gas a chance?

What does BMW and SolarCity's new agreement mean for Tesla, and competitors to SolarCity like SunPower?

Between now and 2035, worldwide energy demand is going to grow substantially. And that means a lot of opportunity for Royal Dutch Shell and ExxonMobil, not to mention deepwater drillers like Seadrill and Transocean. How much opportunity, you ask? Between both oil and gas, growth is expected to double. Are you invested to take advantage of this trend?

Concerns about rising global temperatures -- largely due to carbon emissions from fossil fuels -- are real and valid. But for investors, this isn't the only reason SunPower, First Solar, and GT Advanced Technologies are poised to deliver long-term gains.

The once ubiquitous blue and yellow stores are going away, but Dish Network needs Blockbuster more now than ever.

On the surface, Clean Energy Fuels' earnings looked pretty underwhelming. But a little digging goes a long way, as with Westport Innovations and Shell's earnings.

SolarCity shares were down as much as 18% today, following a mostly stellar earnings report on November 7. SunPower and First Solar are also feeling the cold. After impressive earnings for all three in the past week, what gives? And is Trina Solar the underlooked best investment right now?

Brookfield Infrastructure Partners operates one of the most boring -- yet critical -- businesses in the world. Clean Energy Fuels and First Solar are both in the midst of potentially game-changing stories, but at the price of taking investors on a bumpy ride.

Just a week ago, First Solar, GT Advanced Technologies, SunPower, and SolarCity were all down between 7% and 16% in less than a two-week period. A week later, they're up 21% on average. Did investors miss out?

Westport Innovations' earnings report, and that of Ultra Petroleum, give us a little insight into the future for Clean Energy Fuels

First Solar, SunPower, SolarCity, and GT Advanced Technologies are all down over the past two weeks. What gives?