Lately I am sliding towards sci-fi, so I quickly finished the first book of the Fifth Wave trilogy by Rick Yancey. 
Whilst I am not totally convinced to buy the rest, I liked the story, the plot twists, the protagonists. A bit focused towards adolescents, which I found an unnecessary addition to the overall believable and well-thought scenario.
Wind energy tapes the Earth’s winds to create electricity through wind turbines. Wind turbines can be HAWTs (Horizontal-Axis Wind Turbines), widely used, or VAWTs (Vertical-Axis Wind Turbines). VAWTs are designed to be used mainly within urban areas. The turbines can be deployed onshore (on land), producing cheaper electricity or offshore (near cost), producing more reliable electricity.
A wind turbine uses the inflow of wind to activate the blades and the rotor. They spin the main shaft and gearbox, which spin the generator, producing electricity. Blades work basically like a reversed airplane wing.
The design of a wing facilitates lift, while the wind turbine blade facilitates push, with the most important part (and most expensive materials) at the top of the blade, because most of the aerodynamic loading is created there. The blade is made of fibreglass (cheaper than aluminium, with similar structural resistance).
The rotor assembly is the main focus now for improving the turbine (Bazilevs, Wind Turbines: Future of Energy, 2014).
As expected, the book reveals an illuminated mind, with an impressive vocabulary. Not much of an action-orientated story, it talks about his inner 
debates, quite brilliantly penned. I started the book in late 2009, from my old roommate, but it was worthy to pursue it for 6 long years. Not an easy read, but a read that makes you think.
Oil or petroleum was once a key player in the electricity sector, but now it is used only marginally, usually as back-up reserve in diesel generators for major consumers, such as factories, hospitals, airports or as an electricity source in islands (for example in Greece).
Oil lost its share because of price, it is far more expensive to burn oil than burning coal or gas.
Merits of oil include high energy density, easy to transport and very stable composition, remaining liquid in most climatic conditions. Drawbacks of oil are price are environmental concerns (Webber, 2014).
Mike Bostan - personal blog on book reviews and energy studies 