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Technology development is a keystone within the efforts toward enabling   longer duration of the world fossil energy resources. The past development   and the technologies applied, cause huge emissions of СО2 that must be   significantly reduced. Increased usage of renewable energy sources for   electricity generation (RES-e) contributes essentially to the reduction of   CO2, but on the other hand, under current conditions of feed-in priority   reduces also the market for the electricity from fossil fuelled power plants   (FFPP). The other possibility for reduction of CO2 emissions is to apply   carbon capture and storage technologies as a part of overall FFPP   technologies. A hypothesis presented in this paper is that there is a   marginal share of RES variable electricity in overall annual electricity   supply after which further increase of RES-e participation produces higher   average electricity generated cost, than in the case of CO2 emission   reduction by applying CCS technologies. The presented work confirms this   hypothesis. Value of the marginal share depends to the price of RES-e   feed-in. With the price span from 13.5 to 7.5€c/kWh, the marginal share is   under 50%

Marginal share of renewable energy sources of variable electricity generation: A contribution to the concept definition