London, UK [RenewableEnergyAccess.com] “Pay-Back Time,” a documentary on feed-in tariffs, will be broadcast as part of TVE’s ‘Earth Report’ series on the BBC World channel May 5 and 6 (see first link below for schedule). Householders installing wind turbines and solar panels in the UK must wait many years for a pay-back on their investment, so it is an ethical not an economic choice. Now Germany is buying back spare clean energy from customers at four to five times the price it charges them for conventionally generated electricity. More than 40 countries, states and provinces now follow the German lead. But some countries like the UK use a quota system, which critics argue is inequitable and fundamentally flawed. Earth Report investigates.