Younicos battery storage Bulgaria

Centrica (UK) Younicos has been selected by Centrica to design and deliver one of the world’s largest battery-based energy storage systems. To be completed by winter 2018, the 49 megawatt (MW) lithium-ion system will respond to fluctuations in electrical demand in less than a second, to maintain electric power frequency and stability. [pdf]
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How much tilt should photovoltaic panels have to be to be effective

To optimize performance, tilt your panels at an angle that is 10-15 degrees less than your latitude. For example, if you live at a latitude of 40 degrees, set your panels at about 25-30 degrees. [pdf]