This economist article starts with the story of a recent hour in Europe when the wholesale price of electricity went negative – meaning that power companies with base load power plants (nuclear, brown coal) had to pay “the grid” to accept the excess power.
http://www.economist.com/news/briefing/21587782-europes-electricity-providers-face-existential-threat-how-lose-half-trillion-euros
Solar and wind is now a large portion of the power sold into the grid, but by its nature it is very volatile in capacity. Generate enough and you invert demand where the demand not met by green energy falls below that of what conventional electric plants produce in steady state.
Complicating things is the switch in the US from coal to fracked natural gas has created a glut of high quality coal – making it cheaper for Europeans to burn coal that their own natural gas (like from Libya or Qatar, home of Al Jazeera [keep this in mind when you see Al Jazeera trying to influence Americans to demand a stop to fracking]
Since utilities have been viewed as safe long term investments, things like pension funds are heavily loaded up on them, and taking huge losses.
The economies of the world are interdependent. Change one piece, an effect pops up on the other side of the world.