Solar Energy Perspectives - IEA

Foreword
Foreword
Solar energy technologies have witnessed false starts, such as the early boom of solar water
heaters in California a century ago, and the renewed interest that followed the first and second
oil shocks. Will they now fulfil their promise to deliver affordable, abundant, inexhaustible
and clean energy? Which solar technologies are really close to competitiveness, in which
circumstances and for which uses? What kind of policy support do they require and for how
long? What are the costs, who will bear them? What are the benefits, and who will reap them?
The rapid evolution of these technologies makes policy answers to those questions unusually
difficult. Up to now, only a limited number of countries have been supporting most of the
effort to drive solar energy technologies to competitiveness. Concerns about costs have also
sometimes led to abrupt policy revisions. Policies may lapse or lose momentum just a few
years before they would have succeeded.
This timely publication is the first in-depth IEA technology study focusing on renewable
technologies. It offers relevant information, accurate data and sound analyses to policy
makers, industry stakeholders, and the wider public. It builds upon the IEA Energy Technology
Perspectives in considering end-use sectors and the ever-growing role of electricity. It also
builds on many IEA Technology Roadmaps in elaborating an integrated approach to various
solar energy technologies. It shows how they could combine to respond to our energy needs
in providing electricity, heat and fuels.
This publication also investigates ways to make support policies more effective and costeffective.
It suggests that comprehensive and fine-tuned policies supporting a large portfolio of
solar energy technologies could be extended to most sunny regions of the world, where most of
the growth of population and economy is taking place. If this were the case, solar energy could
well become a competitive energy source in many applications within the next twenty years.
In the penultimate chapter, this publication departs from usual IEA work and complements
our least-cost modelling exercises by depicting a world in which solar energy reaches its very
fullest potential by the second part of this century. A number of assumptions are made to see
what might be possible in terms of solar deployment, while keeping affordability in sight.
Under these assumptions, solar energy has immense potential and could emerge as a major
source of energy, in particular if energy-related carbon dioxide emissions must be reduced to
quite low levels and if other low-carbon technology options cannot deliver on large scale.
While this outcome is hypothetical, it does suggest that current efforts are warranted to enrich
the portfolio of clean and sustainable energy options for the future.
Maria van der Hoeven
Executive Director
This publication has been produced under the authority of the Executive Director of the
International Energy Agency. The views expressed do not necessarily reflect the views or
policies of individual IEA member countries.
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© OECD/IEA, 2011