Feed-in tariff changes are to negatively impact photovoltaic (PV) installations in France, Belgium, Spain and Czech Republic in 2011, according to a new report from iSuppli Corp. However, the robust and stronger than expected growth of the German market for 2010 and 2011 will keep overall installations figures up compared with previous years. The market research firm expects worldwide installations in 2010 will amount to 15.8GW up from iSuppli’s previous outlook of 14.2GW, representing 118.7% growth from 7.2GW installed in 2009. In 2011 installations will amount to 19.3GW, down slightly from its previous forecast of 20.2GW.