Document:

EX-10.73

 Exhibit 10.73 
 SPECIAL CONTRACT FOR 
 NATURAL GAS TRANSPORTATION SERVICE 

Whereas, ENSTAR Natural Gas Company (“Company”), and Chugach Electric Association, Inc. (“Customer”) desire to enter
into a contract for the transportation of Customer’s natural gas; and 
 Whereas, the Customer is certificated to provide
electric public utility service in and around Anchorage, Alaska; and 
 Whereas, since November 2011, the Company has
transported natural gas to the Customer’s Beluga Power Plant under a Special Contract between the Company and Customer, signed on September 15, 2011 (“2011-2012 Special Contract”) ; and 

Whereas, the full term of the 2011-2012 Special Contract runs from November 1, 2011 through October 31, 2012; and 

Whereas, the Customer has an ongoing need for transportation of Gas by the Company to supply its Beluga Power Plant as a supplement to
existing firm service the Customer has from other sources; and 
 Whereas, the Customer has asked the Company to provide an
interruptible transportation service beginning November 1, 2012, through October 31, 2013; and 
 Whereas, the Company
is willing to provide a supplemental interruptible transportation service for the period commencing on November 1, 2012 and ending on October 31, 2013; and 

  
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 Whereas, the service being provided by the Company is not a backup firm service and is fully
interruptible under the terms of Section 1620 of the Company’s Tariff as modified by this Special Contract; and 

Whereas, by providing this service, the Company is not undertaking any express or implied commitment to the Customer beyond the term of
this Special Contract, and is not agreeing that it has any obligation to serve the Customer beyond the obligations memorialized in this Special Contract; 
 Whereas, the unique circumstances of the Customer’s transportation service requirements qualify it for this Special Contract; and 

Whereas, the Company is willing to provide a supplemental interruptible transportation service to the Customer’s under the terms
stated below, provided that it does not interfere with its ability to meet other, existing delivery obligations. 
 In
consideration of the covenants and conditions in this Special Contract, the parties agree as follows: 
 ARTICLE I

 PARTIES 
 1.1 The parties to this contract are ENSTAR Natural Gas Company, a division of SEMCO Energy, Inc. (“Company”) and Chugach Electric Association, Inc. (“Customer”). Terms which are
capitalized in this Special Contract are defined either in the Company’s Tariff or in this Special Contract. 

  
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 ARTICLE II 

TERM 
  

	2.1	Term 

 The full term of this Special
Contract shall be from November 1, 2012 through October 31, 2013. Any extension of term will be by mutual agreement of both parties, in writing, at least 90 days prior to the expiration date of the full term. 

ARTICLE III 
 MODIFIED TARIFF PROVISIONS 
  

	3.1	Transportation of Gas 

The Company agrees to provide interruptible transportation service to the Customer under Section 1620 of the Company’s Tariff as
modified below. To assist the Company in providing this service, the Customer shall provide the Company with the forecasts and nominations required by Section 1605c and 1605d of the Company’s Tariff, including but not limited to the
Monthly and Daily nominations required by Sections 1605d(1) and 1605d(3) as modified below, and adhere to the balancing provisions as set out in Section 1605e. If Customer requests service for a given Day, the Customer anticipates an intraday
rate of up to 10,000 MCF and the maximum delivery in a Day will be a total of 5,000 MCF. 
  

	3.2	Price 

 In consideration
of the services provided by the Company to the Customer, the Customer shall pay the Company a Monthly Customer Charge of $11,000 and a 

  
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Volumetric Charge of $0.20 for every Mcf of natural gas transported under this Special Contract. Service under this Special Contract will be subject to additional fees and charges as provided for
in the Company’s Tariff including, but not limited to, the Regulatory Cost Charge as outlined in Tariff Section 2401 and the additional fees set out in Tariff Section 2561. 

 

	3.3	Other Terms 

  

	3.3.1	The Company will not be responsible for any damages the Customer may incur as the result of curtailment or interruption of any or all of the transportation service
under this Special Contract. 

  

	3.3.2	The Company and the Customer will work together to utilize the steps defined in the 2009 Gas Emergency Agreement Letter to maintain adequate transmission and
distribution pressures in the Company’s transportation system during any gas supply emergency. 

  

	3.3.3	If the Customer incurs Interruption Expense as defined by the Company’s Tariff Section 1205 (Interruption Cost Sharing) as a result of curtailment or
interruption of any or all of the transportation service under this Special Contract it is not entitled to reimbursement of those Interruption Expenses by the Company. 

 

	3.4	Nominations and Balancing 

  

	3.4.1	 The Customer agrees to provide the Company notice by 4:00 PM ACT of the Day prior to any Day it wishes to utilize this service. Nominations shall be
provided to ENSTAR Gas Control in writing and confirmed with ENSTAR Gas Control before gas flows. The Customer agrees to provide the initial transportation nominations by 4:00 PM each day prior to requesting transportation service. The customer

  
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agrees to use commercially reasonable efforts to nominate gas into the ENSTAR system on a daily basis using four (4) standard nomination periods in a day (24 hour period starting at 12:00 AM
(midnight) through 11:59 PM): 

 a. 12:00 AM to 6:00 AM 

b. 6:00 AM to 12:00 PM 
 c. 12:00 PM to 6:00 AM 
 d. 6:00 PM to 11:59:59 PM 

The Customer will provide estimated hourly set points for Meter 8107 and the Company will apply commercially reasonable efforts to follow.

 The Customer will nominate gas based on an average load calculation for each intra-day nomination period. The Company and
Customer understand that Customer deliveries will vary from the average based on actual (instantaneous) generation requirements. 
  

	3.4.2	Customer will comply with Daily balancing tolerances per the Tariff. The Customer will schedule daily gas balance accrual settlement on a weekly basis.

  

	3.4.3	The Company agrees to notify the Customer two hours prior to interruption except in the case of a Gas flow disruption to the Company from the Beluga River Unit
(including a compressor failure) where the Company agrees to notify the Customer 30 minutes prior to interruption. 

  
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 ARTICLE IV 

DELIVERY/RECEIPT POINTS 
  

	4.1	Delivery Point 

 The
Delivery Point for this Special Contract is the Customer’s Beluga Power Plant at the Company’s Metering Station #B253, Meter 8107. 
  

	4.2	Receipt Points 

 Receipt
Points are as follows: 
  

	4.2.1	Interconnection of the KNPL – APC Kenai pipelines: Station K681, Meter 411. 

 Suppliers and Supplier contact information: 
  

			
	ConocoPhillips Company (“COP”) and ConocoPhillips Alaska, Inc. (“CPAI”)
	Attention:	  	Cook Inlet Marketing
		  	Cook Inlet Control
	Telephone:	  	(907) 265-1605
		  	(907) 263-4704 or cell: (907) – 748-5966
	Facsimile:	  	(918) 662-6895
	E-mail	  	Joe Falcone
		  	Joe.Falcone@conocophillips.com
	
	Marathon Alaska Production LLC
	Attention:	  	Gas Supply and Transportation Representative
	Telephone:	  	(907) 283-1308
	Facsimile:	  	(907) 283-6175
	E-mail:	  	fwbassetti@marathonoil.com

  

	4.2.2	Interconnection of the KKPL – APC Kenai pipelines: Station K680, Meter 601. 

 Suppliers and Supplier contact information: 
  

			
	Marathon Alaska Production LLC
	Attention:	  	Gas Supply and Transportation Representative
	Telephone:	  	(907) 283-1308
	Facsimile:	  	(907) 283-6175
	E-mail:	  	fwbassetti@marathonoil.com

  

	4.2.3	Kenai Unit Connection: Station K670, Meters 500 & 505. 

  

	Suppliers	and Supplier contact information: 

  

			
	Marathon Alaska Production LLC
	Attention:	  	Gas Supply and Transportation Representative
	Telephone:	  	(907) 283-1308
	Facsimile:	  	(907) 283-6175
	E-mail:	  	fwbassetti@marathonoil.com

  
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	4.2.4	Interconnection of Beluga Pipe Line Company – APC Beluga pipeline: Station B605, Meters 700 & 701. 

Suppliers and Supplier contact information: 
  

			
	Marathon Alaska Production LLC
	Attention:	  	Gas Supply and Transportation Representative
	Telephone:	  	(907) 283-1308
	Facsimile:	  	(907) 283-6175
	E-mail:	  	fwbassetti@marathonoil.com

 ARTICLE V 
 APPLICABILITY OF THE COMPANY’S TARIFF 
  

	5.1	Tariff 

 Except as
expressly modified by this Special Contract, all of the terms and conditions of the Company’s Tariff (RCA No. 4) shall apply to the Services provided by the Company to the Customer under this Special Contract, including without limitation
Section 1200 (Interruption). Further, due to the anticipated average and peak daily demand of the Customer, the following Sections of the Company’s Tariff will apply: Section 1605c (Forecasts), Section 1605d (Nominations),
Section 1605e (Balancing), Section 1605f (Pressure), 1605g (Measuring Stations), Section 1605h (Measurement), and Section 1605j (Credit and Billing). 

  
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	5.2	Balancing 

 With respect
to Section 1605e of the Company’s Tariff, (Balancing) the Customer’s daily nominations will be compared to the actual volumes delivered to the Customer for the purposes of applying the Daily Balancing Tolerances and computing Over or
Under Supply pursuant to Sections 1605e(3) and 1605e(4). 
  

	5.3	The Company’s Tariff 

The Customer acknowledges that it has a copy of the Company’s Tariff RCA No. 4 and is familiar with its provisions. 

ARTICLE VI 
 RCA APPROVAL 
  

	6.1	RCA Approval 

 The Parties
understand that this Special Contract does not take effect without the prior approval of the Regulatory Commission of Alaska (“RCA”) and is, at all times, subject to revisions by the Commission. This Special Contract shall be effective on
the date of a final order by the RCA approving this Special Contract. 
  

	6.2	Termination Due to Form of RCA Approval or Amendment 

 In the event that revisions to this Special Contract are required by the RCA or any other governmental body acting within its jurisdiction and the revisions are not acceptable to either party, either
party may terminate this Special Contract by giving notice under this Article 6.2 within thirty (30) days of receipt of the order requiring the revisions. 

  
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 ARTICLE VII 

ADDRESSES 
  

	7.1	Notices 

 All notices,
except as provided for nominations and billings, shall be given in writing at the address set forth below. Notice shall be deemed to have been given when received by the Company or the Customer at those addresses. 

7.1.1 FOR THE COMPANY: 
 For Transportation Nominations from the Customer, Scheduling and Day to Day Operations: 
  

			
	ENSTAR Natural Gas Control
	ATTN: Gas Control
	Physical Address:
	401 E. International Airport Road
	Anchorage, AK 99518
	Mailing Address:
	P.O. Box 190288
	Anchorage, AK 99519-0288
	Telephone:	  	907 334-7788
	Facsimile:	  	907 334-7779
	E-mail:	  	EnstarGasControl@enstarnaturalgas.com

 For Payments: 
  

			
	ENSTAR Natural Gas Company
	ATTN: General Accounting Supervisor
	Physical Address:
	3000 Spenard Road
	Anchorage, AK 99503
	Mailing Address:
	P.O. Box 190288
	Anchorage, AK 99519-0288
	Telephone:	  	907 334-7628
	Facsimile:	  	907 272-3403
	E-mail:	  	natalia.nelson@enstarnaturalgas.com

  
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 For all other Notices: 

 

					
	 	ENSTAR Natural Gas Company
	 	Attention: Manager, Gas Supply &
	 	                 Director, Business Development
	 	Address: Physical:	  	  	3000 Spenard Road
				  	Anchorage, AK 99503
	 	Mailing:	  	  	P.O. Box 190288
				  	Anchorage, AK 99519
	 	Telephone:	  	  	(907) 334-7756
	 	Facsimile:	  	  	(907) 334-7671
	 	E-mail:	  	  	Mark.Slaughter@enstarnaturalgas.com
				  	John.Sims@enstarnaturalgas.com

 7.1.2 FOR THE CUSTOMER: 
 For Scheduling and Day to Day Operations: 
  

					
	 	Attention:	  	  	Director System Control
	 	cc:	  	  	Manager, Fuel Supply
	 	Address: Physical:	  	  	5601 Electron Drive
				  	Anchorage, AK 99518
	 	Mailing:	  	  	P.O. Box 196300
				  	Anchorage, AK 99519
	 	Telephone:	  	  	(907) 762-4779
	 	Facsimile:	  	  	(907) 762-4792
	 	E-mail:	  	  	burke_wick@chugachelectric.com
				  	andrew_white@chugachelectric.com

 For Billings and Payment: 

 

					
	 	Attention:	  	  	Director System Control
	 	Address: Physical:	  	  	5601 Electron Drive
				  	Anchorage, AK 99518
	 	Mailing:	  	  	P.O. Box 196300
				  	Anchorage, AK 99519
	 	Telephone:	  	  	(907) 762-4779
	 	Facsimile:	  	  	(907) 762-4792
	 	E-mail:	  	  	burke_wick@chugachelectric.com

  
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 For All Other Notices: 

 

					
	 	Attention:	  	  	Director System Control
	 	Address: Physical:	  	  	5601 Electron Drive
				  	Anchorage, AK 99518
	 	Mailing:	  	  	P.O. Box 196300
				  	Anchorage, AK 99519
	 	Telephone:	  	  	(907) 762-4779
	 	Facsimile:	  	  	(907) 762-4792
	 	E-mail:	  	  	burke_wick@chugachelectric.com

 ARTICLE VIII 
 OTHER TERMS 
  

	8.1	Indemnification 

 The
Customer will indemnify, defend and hold the Company harmless against any and all claims by other Cook Inlet purchasers or producers concerning the purchasing of Gas or the priority of Gas taken under this Special Contract. 

 

	8.2	Limit of Obligation 

 By
making this commitment to transport Gas to the Customer, the Company is not agreeing that it has any obligation, beyond the term of this Special Contract, to transport Gas to the Customer’s Beluga Power Plant. 

 

	8.3	Gas Availability 

 This
Special Contract is contingent upon the Customer securing delivery of adequate gas to the Receipt Points. 

  
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 ARTICLE IX 

MISCELLANEOUS 
  

	9.1	Binding Upon Successors 

This Special Contract shall be binding upon and inure to the benefit of the legal representatives, successors and assigns of the parties.
Except as provided below, neither party may assign its rights and obligations under this Special Contract without first obtaining the written consent of the other. Consent is not required if all or substantially all of the assets of the Company or
the Customer are acquired by another person or the Company or the Customers is merged, consolidated or reorganized with another person, provided that the assignee assumes in writing the assignor’s obligations under this Special Contract.
Nothing contained in this Article shall prevent either party form pledging or mortgaging its rights under the Special Contract for security of its indebtedness. 
  

	9.2	Special Contract Not to be Construed Against Either Party as Drafter 

 The parties recognized that this Special Contract is the product of the joint efforts of the parties and agree that it shall be construed according to its plain meeting and shall not be construed against
either party as drafter. 
  

	9.3	Entire Agreement 

 This
Special Contract and the Company’s Tariff constitute the entire agreement and understanding between the parties concerning the subject matter of this transaction, and all prior agreements, understandings and representations, whether oral or
written, concerning this subject matter are superseded by this written Special Contract. No amendment to this Special Contract shall be binding on either party until reduced to writing and signed by the parties. 

  
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	9.4	Headings 

 The headings
throughout this Special Contract are for reference purposes only and shall not considered in interpreting this Special Contract. 
  

	9.5	No Incidental or Consequential Damages 

 Neither party shall have any liability to the other for incidental or consequential damages resulting from this Special Contract. 

 

	9.6	No Intended Third-Party Beneficiary 

 The parties understand and agree that no person or entity is an intended third party beneficiary of this Special Contract. 
 IN WITNESS WHEREOF, the parties have executed this Special Contract in two (2) originals. 
  

			
	Chugach Electric Association, Inc.
		
	By:	 	 /s/ Bradley Evans

		
	Title:	 	 CEO

		
	Date:	 	 November 9, 2012

	
	ENSTAR Natural Gas Company, a Division of SEMCO Energy, Inc.
		
	By:	 	 /s/ M.C. Starring

		
	Title:	 	 President

		
	Date:	 	 10-31-2012

  
 Page 13 of 13EX-10.74

 Exhibit 10.74 
 CHUGACH ELECTRIC ASSOCIATION, INC. 
 FIRM TRANSPORTATION 

SERVICE AGREEMENT 
 This Service Agreement is made between Chugach Electric Association (the “Customer) and ENSTAR Natural Gas Company, a division of SEMCO Energy, Inc., (the “Company) on May 21st , 2012 for natural gas transportation service to be supplied under
the Company’s Rate Schedule Very Large Firm Transportation Service (VLFT), which is incorporated by reference. 
  

	 	1.	The general terms and conditions for this service are set out in the Company’s tariff, including Sections 1605 and 1640. The rates for this transportation service
are set out in the Company’s tariff Section 2150. The monthly rate and customer charge and demand charge applies to each individual Delivery Point receiving service under Schedule VLFT, in accordance with tariff Section 704. Volumes
from individual Delivery Points will not be combined or aggregated unless it is for the convenience of the Company. 

  

	 	2.	 VLFT Service to the Customer will commence on August 1st, 2012, and this Service Agreement shall remain in effect
through August 1st 2013, and Year to year thereafter until canceled upon twelve Months written notice by either party. Final notice of the commencement date for Service will be documented by e-mail or fax. The gas to be
transported is for the ultimate delivery only to the end user(s) listed as Delivery Points in Attachment B. 

  

	 	3.	The Customer agrees to a Contracted Peak Demand of 36,300 Mcf per day, and agrees to pay the Company a Demand Charge, as calculated under Schedule
VLFT, in accordance with the Company’s tariff Sections 2150b and 2150c. If this Service Agreement is extended by the parties, the Customer will pay a Demand Charge for the period that is extended. If, as a result of the Service commencement
date or Service termination date, Service is provided for a partial month, the Demand Charge and Customer Charge will be pro rated based upon the ration of the number of days Service was provided during the Month over the number of Days in the
Month. 

  

	 	4.	If the Company is unable to deliver the Contracted Peak Demand on any Day due to capacity limitations of its pipeline system, the Demand Charge for that Month will be
reduced to reflect the amount that was actually delivered for that Day taking into account the number of Days during the Month that capacity was not limited. 

 

	 	5.	Receipt Points for gas transported are listed in Attachment A along with the gas suppliers and a contact for each receipt point. The Delivery Point(s) are listed in
Attachment B along with a contact for each Delivery Point. -The Customer agrees to use reasonable effort to notify the Company’s gas control dispatcher of actual production plans and any material change by phone (907) 334-7788, by
facsimile at (907) 334-7779, or by e-mail at enstar.gascontrol@enstarnaturalgas.com. 

 CHUGACH ELECTRIC ASSOCIATION, INC. 
 SOUTHCENTRAL POWER PLANT 
 FIRM TRANSPORTATION SERVICE AGREEMENT 

MAY 2012 
  Page
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 of 3 
  

	 	6.	The Customer agrees to the terms and conditions of payment provided in the Company’s tariff. 

 

	 	7.	Notices to the Customer and Company, and billings for service to the Customer shall be mailed or delivered to the addresses listed below. Telephone and facsimile
numbers are provided for other communications. 

  

							
	Notices to Customer:	 	Notices to Company:
	For Scheduling and Day to Day	 	
	Plant Operations:	 	
	Chugach Electric Association, Inc.	 	ENSTAR Natural Gas Company
	ATTN:	 	Director System Control	 	ATTN:	 	Gas Control
		 	Manager, Fuel Supply	 		 	
	Address:	 		 	Address:	 	
	Physical:	 	5601 Electron Drive	 	Physical:	 	401 E. International Airport Road
		 	Anchorage, AK 99518	 		 	Anchorage, AK 99518
	Mailing:	 	P.O. Box 196300	 	Mailing:	 	P.O. Box 190288
		 	Anchorage, AK 99519	 		 	Anchorage, AK 99519
	Telephone:	 	(907) 762-4779	 	Telephone:	 	(907) 334-7788
	Facsimile:	 	(907) 762-4792	 	Facsimile:	 	(907) 334-7779
	E-Mail:	 	burke_wick@chugachelectric.com	 	E-Mail:	 	enstar.gascontrol@enstarnaturalgas.com
		 	andrew_white@chugachelectric.com	 		 	
			
	For Payments:	 		 	
	ATTN:	 	Director System Control	 	ATTN:	 	General Accounting Supervisor
	Address:	 		 	Address:	 	
	Physical:	 	5601 Electron Drive	 	Physical:	 	3000 Spenard Road
		 	Anchorage, AK 99518	 		 	Anchorage, AK 99503
	Mailing:	 	P.O. Box 196300	 	Mailing:	 	P.O. Box 190288
		 	Anchorage, AK 99519	 		 	Anchorage, AK 99519
	Telephone:	 	(907) 762-4779	 	Telephone:	 	(907) 334-7628
	Facsimile:	 	(907) 762-4792	 	Facsimile:	 	(907) 272-3403
	E-Mail:	 	burke_wick@chugachelectric.com	 	E-Mail:	 	natalia.nelson@enstarnaturalgas.com
			
	For All Other Notices:	 		 	
	ATTN:	 	Director System Control	 	ATTN:	 	Manager, Business Development
		 		 		 	Manager, Gas Supply
	Address:	 		 	Address:	 	
	Physical:	 	5601 Electron Drive	 	Physical:	 	3000 Spenard Road
		 	Anchorage, AK 99518	 		 	Anchorage, AK 99503
	Mailing:	 	P.O. Box 196300	 	Mailing:	 	P.O. Box 190288
		 	Anchorage, AK 99519	 		 	Anchorage, AK 99519
	Telephone:	 	(907) 762-4779	 	Telephone:	 	(907) 264-3794
	Facsimile:	 	(907) 762-4792	 	Facsimile:	 	(907) 334-7737
	E-Mail:	 	burke_wick@chugachelectric.com	 	E-Mail:	 	inna.johansen@enstarnaturalgas.com
		 		 		 	mark.slaughter@enstarnaturalgas.com

 CHUGACH ELECTRIC ASSOCIATION, INC. 
 SOUTHCENTRAL POWER PLANT 
 FIRM TRANSPORTATION SERVICE AGREEMENT 

MAY 2012 
  Page
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 of 3 
  

									
	Chugach Electric Association, Inc.	 	ENSTAR Natural Gas Company
					
		 	By:	 	 /s/ Bradley Evans
	 	By:	 	 /s/ M. Colleen Starring

					
		 	Title:	 	 CEO
	 	Title:	 	 President

					
		 	Date:	 	 July 31, 2012
	 	Date:	 	 May 18, 2012

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