1. Renewable generation faces a mixture of old and new barriers in electricity systems.2. Coping with 25% or more variable generation is more difficult for grids and utilities than managing a 5% proportion.3. Among the policy measures being taken to deal with high wind and solar penetration are caps on renewables subsidies, capacity markets to keep fossil-fuel plants open, and the installation of phase shifting transformers.4. New challenges: the levying of grid access charges on owners of small-scale solar installations; and the tendency for European utilities to cut investment.5. Renewable power in many developing countries faces a struggle to secure debt at interest rates and tenors that make projects viable.6. The move by many governments towards auctioning renewables capacity will provide challenges to project developers and financiers.
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