This paper reviews the United States' experience with utility sponsore
d energy conservation programs. Such programs are central to the recen
t discussions about electric utility regulation in the United States a
nd elsewhere. First it is shown that these programs are exposed to thr
ee problems on the consumers' side - rebound, adverse selection and mo
ral hazard - which lower the effectiveness of conservation incentives
and impede in most practical cases a reliable quantification of the ac
hieved conservation. Moreover, the utilities have under the regulatory
practice an incentive to invest in conservation measures but to limit
factual conservation through a proper design of the program. Reviewin
g the recent literature shows that these four crucial points, which af
fect many of the applied conservation programs, are either insufficien
tly covered (rebound and adverse selection) of neglected entirely (mor
al hazard and regulated utilities' interest in little conservation). W
e conclude, that this undertaking has resulted in insignificant conser
vation and doubt the adequacy of these programs to reduce external soc
ial costs from energy use.