Guardian: Renewable power companies have been forced to abandon attempts to raise money on the London and Madrid stock markets amid fallout from the European debt crisis and concerns about future public spending levels. Among the victims are Engyco, led by the former United Utilities boss John Roberts. The company told The Guardian today that it was unable to proceed with a £1bn initial public offering in the City. "The situation is that it [the IPO] is on hold but the company is …