POWER OF ATTORNEY


	The undersigned is a Director and/or Officer of INTEGRYS
ENERGY GROUP, INC., a Wisconsin corporation, or one of its
subsidiaries.  Integrys Energy Group, Inc. has outstanding Common
Stock, $1 par value, which is registered under Section 12(b) or
Section 12(g) of the Securities Exchange Act of 1934.
The undersigned does hereby constitute and appoint Diane L. Ford,
Peter H. Kauffman, or Barth J. Wolf as attorney, with full power
to act for the undersigned and in the name, place and stead of
the undersigned, to sign the name of the undersigned on any or
all Forms 3, 4, and 5 to be filed pursuant to the requirements of
Section 16(a) of the Securities Exchange Act of 1934and the
rules, instructions and official interpretations relating
thereto.

      The undersigned acknowledges that each attorney in fact,
is serving in such capacity at the request of the undersigned,
is not assuming, nor is such attorney in fact's substitute or
substitutes or Integrys Energy Group, Inc. assuming any of the
undersigned's responsibilities to comply with the Securities
Exchange Act of 1934.  The undersigned agree to defend
and hold harmless each attorney in fact (and such attorney in
fact's substitute or substitutes) from and against any and all
loss, damage or liability that such attorney in fact may sustain
as a result of any action
taken in good faith hereunder.

	This power of attorney shall remain in effect so long as
the undersigned may be required to file reports under said
Section 16(a) with respect to securities of Integrys Energy
Group, Inc. unless earlier notice of revocation hereof is
delivered to each of the foregoing attorneys in fact.

	IN WITNESS WHEREOF, the undersigned has executed this
document this 12th day of February, 2007.


/s/ Bernard J. Treml
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Bernard J. Treml