Classification
EHA - Renewable energy sources
EBA - Energy production, energy technology
5
ENA - Energy from biomass and waste
5
EIA - Solar energy - general
4
EKA - Wind energy
3
UKE - Environment and energy resources
3
AFG - Large scale research institutions (Helmholtz Centres)
2
ETC - Energy conversion
2
UKA - Environmental damage and energy production
2
CHXP - Thermochemistry
1
CNW - Electrochemical energy production and conversion
1
EAD - Energy - comprehensive works
1
ECA - Energy resources
1
EIP - Photovoltaics
1
EIS - Solar cells
1
ELA - Geothermal energy
1
EMA - Hydroelectric, tidal energy
1
ESB - Hydrogen energy
1
ETA - Energy storage
1
EVN - Energy supply - future aspects
1
EVP - Energy models, energy system analysis
1
EWA - Energy economy
1
EXA - Energy policy
1
EYA - Energy problems of developing countries
1
LWO - Agricultural ecology, sustainable agriculture
1
UEF - Sustainability
1
UHCH - Urban areas
1
UMV - Climatic change
1
YPW - Economy of industry branches
1