Certyfikat energii odnawialnej o podwójnej wartości /większej wartości , (tzw. Zielony certyfikat); (mając wartość /charakter podwójny)

....przeprowadzonej inwestycji w źródła energii odnawialnej i sprzedaży energii, białe certyfikaty .... to będą musieli zwrócić podwójną wartość certyfikatów. ...
www.ptce.pl/html/pdf/biuletyn_ptce_01_2008.pdf -

http://biurose.sejm.gov.pl/teksty_pdf_03/i-976.pdf
A Green Certificate also known as Renewable Energy Certificates (RECs) is a tradable commodity proving that certain electricity is generated using renewable energy sources. Typically one certificate represents generation of 1 Megawatthour of electricity. What is defined as "renewable" varies from certificate trading scheme to trading scheme.

Green certificates represent the environmental value of renewable energy generated. The certificates can be traded separately from the energy produced. Several countries use green certificates as mean to make the support of green electricity generation closer to market economy instead of more bureaucratic investment support and feed-in tariffs. Such national trading schemes are in use in e.g. Poland, Sweden, the UK, Italy, Belgium (Wallonia and Flanders), and some US states.
http://en.wikipedia.org/wiki/Green_certificate

http://odnawialny.blogspot.com/2009/01/res-road-map-2020-czy...

http://www.google.co.uk/search?hl=en&q=Certyfikat energii od...