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While the use of solar cells is become increasingly widespread, the silicon technology used in many types is becoming obsolete. JP Casey looks at concentrated solar power, micro-trackers and perovskite compounds as innovations that could potentially improve solar efficiency.

Oil prices continued their upward trend for the fourth consecutive day on Tuesday on expectations that the US Federal Reserve will cut interest rates for the first time in more than ten years to support the growth in demand for fuel in the country.

The decision by Iraq to invite interest in a number of solar independent power producer (IPP) projects is not the first time that Baghdad has sought to push ahead with competitively tendered IPP schemes.