Exhibit (10)(iii)35 AMENDMENT
TO
CH ENERGY GROUP, INC. 
LONG-TERM PERFORMANCE-BASED INCENTIVE PLAN
(2000 Plan) The CH
Energy Group, Inc. Long-Term Performance-Based Incentive Plan (the Plan) is
amended, effective December 31, 2007, as follows: 1.       The
fourth paragraph of Section 3 of the Plan (and the corresponding section of
each outstanding award agreement that incorporates this Section 3 of the Plan)
is hereby superseded and replaced in its entirety as set forth below: In the event
 of any change in corporate capitalization, such as a stock split or a
 corporate transaction, such as any merger, consolidation, separation,
 including a spin-off, or other distribution of stock or property of the
 Corporation, any reorganization (whether or not such reorganization comes
 within the definition of such term in Section 368 of the Code) or any partial
 or complete liquidation of the Corporation (Corporate Transaction), the
 Committee or Board shall make such equitable substitution or adjustments in
 the aggregate number and kind of shares reserved for issuance under the Plan,
 in the number, kind and option price of shares subject to outstanding Stock
 Options and Stock Appreciation Rights, in the number and kind of shares subject
 to other outstanding Awards granted under the Plan and/or such other
 equitable substitution or adjustments as it may determine to be appropriate
 in its sole discretion to prevent dilution or enlargement of the rights of
 Covered Employees that otherwise would result from such events; provided
 however, that the number of shares subject to any Award shall always be a
 whole number. Such adjusted option price shall also be used to determine the
 amount payable by the Corporation upon the exercise of any Stock Appreciation
 Right associated with any Stock Option. In no event shall any adjustment be
 required if the Committee or the Board determines that such action could
 cause a Stock Option to fail to satisfy the conditions of an applicable
 exception from the requirements of Section 409A of the Code or otherwise
 could subject a Covered Employee to the additional tax imposed under Section
 409A of the Code in respect of an outstanding Stock Option.2.
The Plan is hereby amended by deleting Sections 5(k) and 13(j) in
 their entirety.3.
Section 18 of the Plan is hereby superseded and replaced in its
 entirety as set forth below:SECTION 14. COMPLIANCE WITH SECTION 409A OF THE CODEAwards granted under this Plan shall be designed and administered in
 such a manner that they are either exempt from the application of, or comply
 with, the requirements of Section 409A of the Code. Notwithstanding any other
 provision of the Plan or any Award agreement, an Award shall not be granted,
 deferred, accelerated, extended, paid   out, settled, substituted or modified under this Plan in a manner
 that would result in the imposition of an additional tax under Section 409A
 of the Code upon a Covered Employee. Although the Corporation intends to
 administer the Plan so that Awards will be exempt from, or will comply with,
 the requirements of Section 409A of the Code, the Corporation does not
 warrant that any Award under the Plan will qualify for favorable tax
 treatment under Section 409A of the Code or any other provision of federal,
 state, local, or non-United States law. Neither the Corporation, its
 Affiliates, nor their respective directors, officers, employees or advisers
 shall be liable to any Covered Employee or any other person for any tax,
 interest, or penalties the Covered Employee might owe as a result of the
 grant, holding, vesting, exercise, or payment of any Award under the Plan.
 Any reference in this Plan to Section 409A of the Code will also include the
 applicable proposed, temporary or final regulations, or any other guidance,
 issued with respect to such Section by the U.S. Department of the Treasury or
 the Internal Revenue Service.4.
Except as
 explicitly set forth herein, the Plan will remain in full force and effect.CH ENERGY
 GROUP, INC.By:

/s/
 Steven V. LantSteven V. Lant,
Chairman, President andChief Executive
Officer ofCH Energy
Group, Inc.2