With a solar energy system, you can claim a 26% tax credit and deduct up to 80% of the system cost by depreciation. http://panarkadiko.eu/ns/index.php/2013-08-09-06-17-04/2014-04-08-06-32-51/2016-03-08-07-41-20/5963-1i-diavoulefsi-gia-texnikes-prodiagrafes-diatakseon-nefrikis-ypostiriksis-cpv-33181000-2