Amanda C. Downey

Counsel

August 8, 2014

The Honorable Kimberly D. Bose Secretary

Federal Energy Regulatory Commission 888 First Street, NE

Washington, DC 20426

Re:Niagara Mohawk Power Corporation

Docket No. ER14-____-000

Notice of Cancellation of Service Agreement No. 1630 Engineering, Procurement and Construction Services Agreement with Beacon Power Corporation

Dear Secretary Bose:

Pursuant to Section 35.15 of the Federal Energy Regulatory Commission’s

(“Commission”) regulations,1 Niagara Mohawk Power Corporation d/b/a National Grid (“Niagara Mohawk”) submits for Commission acceptance this Notice of Cancellation of the Engineering, Procurement and Construction Services Agreement (“EPC Agreement”) between Niagara Mohawk and Beacon Power Corporation (“Beacon Power”).

Niagara Mohawk respectfully requests that the Commission accept this Notice of
Cancellation effective as of the day after this filing is submitted, i.e., August 9, 2014.

I.Background and Justification for Cancellation

The EPC Agreement concerns design, engineering, procurement, construction,
and project management and construction services provided by Niagara Mohawk to
effectuate system upgrades necessary for Beacon Power’s interconnection of a 20
megawatt flywheel generating facility to the New York State Electric and Gas
Corporation’s (“NYSEG”) 115 kV system at Stephentown Station in Rensselaer County,
New York via a single breaker tap to the 115 kV bus at the station. Niagara Mohawk’s
Greenbush-Stephentown 993 Line ties to the same 115 kV bus, thereby making Niagara
Mohawk an affected system owner for the interconnection and making it necessary for
Beacon Power and Niagara Mohawk to enter into the EPC Agreement in order to ensure
the reliable interconnection of Beacon Power’s generating facility to NYSEG’s 115 kV
system.

The Honorable Kimberly D. Bose August 8, 2014

Page 2

Niagara Mohawk filed the EPC Agreement in Docket No. ER10-3165-000 as

Original Service Agreement No. 1630 under the Open Access Transmission Tariff of the New York Independent System Operator, Inc. (“NYISO”). The Commission accepted the EPC Agreement for filing effective November 29, 2010.2

Section 2.1 of the EPC Agreement states that it will remain in effect until Niagara Mohawk receives final payment under the EPC Agreement. Niagara Mohawk has
received that final payment.

II.Effective Date

Niagara Mohawk requests that the Commission accept this Notice of Cancellation of the EPC Agreement effective as of August 9, 2014. As noted above, Niagara Mohawk has received final payment under the EPC Agreement. Therefore, good cause exists to grant the requested effective date.3

III.Communications

Niagara Mohawk requests that copies of all notices and correspondence related to

this filing be directed to:

Amanda C. Downey

Counsel for National Grid USA
Service Company, Inc.

40 Sylvan Road

Waltham, MA 02451
Tel: (781) 907-2136

amanda.downey@nationalgrid.com

William L. Malee

Director, Transmission Commercial National Grid USA

40 Sylvan Road

Waltham, MA 02451
Tel: (781) 907-2422

bill.malee@nationalgrid.com

Sean Atkins

Bradley R. Miliauskas Alston & Bird LLP 950 F Street, NW

Washington, DC 20004 Tel: (202) 239-3300

sean.atkins@aslton.com
bradley.miliauskas@alston.com

The Honorable Kimberly D. Bose August 8, 2014

Page 3

IV.Service

This filing has been served on Beacon Power, NYSEG, the NYISO, and the New York Public Service Commission.

V.Conclusion

For the foregoing reasons, Niagara Mohawk requests that the Commission accept this Notice of Cancellation of the EPC Agreement, effective as of August 9, 2014.

Respectfully submitted,

/s/ Amanda C. Downey

Amanda C. Downey
Counsel

National Grid USA

Service Company, Inc.

40 Sylvan Road

Waltham, MA 02451

Attorney for Niagara Mohawk Power
Corporation d/b/a National Grid