CAP ROCK ENERGY CORP

election_required = True...reasonable period of time, the Company may elect to purchase those shares on the basis set forth below: •The Company may first purchase all shares tendered by Odd Lot Holders (as defined below) who tender all shares owned of record by the Odd Lot Holder, and completes the section entitled "Odd Lots" in the Letter of Transmittal and, if applicable, in the Notice of Guaranteed Delivery. •The Company will purchase all other shares tendered with payment on a pro-rata basis. •Tendered shares that are unpurchased will be returned to you at our expense. Odd Lots. The term "odd lots" means all shares tendered by a shareholder who owns an aggregate of fewer than 100 sha...

expiry = 2003-04-08...01 Offer to Purchase for Cash Up to 1,152,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share February 8, 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003. The period in which tendered shares may be purchased, and the withdrawal period, may be extended; however, only shares properly tendered for purchase by 5:00 p.m. Eastern Time, on April 8, 2003, will be purchased. Summary Term Sheet Cap R...

expiry = 2003-04-08...ENT TO OFFER TO PURCHASE FOR CASH Up to 1,152,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share March , 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003, unless extended. 1 SUMMARY TERM SHEET Cap Rock Energy Corporation (the "Company") is offering to purchase shares of its outstanding common stock which were distributed to certain former members of Cap Rock Electric Cooperative, Inc. under...

expiry = 2003-04-08...MENDED OFFER TO PURCHASE FOR CASH Up to 1,302,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share March , 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003, unless extended. The number of shares to be purchased is subject to the terms and conditions contained in this offer, including the amount of cash available to the Company to purchase shares. See Section 6, "Conditions of the Offer" and S...

expiry = 2003-04-30...ENDED OFFER TO PURCHASE FOR CASH Up to 1,302,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share April 3, 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 30, 2003, unless extended. The number of shares to be purchased is subject to the terms and conditions contained in this offer, including the amount of cash available to the Company to purchase shares. See Section 6, "Conditions of the Offer" and S...

mechanism = FIXED...Links -- Click here to rapidly navigate through this document Exhibit (a)(1)(A) Cap Rock Energy Corporation 500 W. Wall Street, Suite 400 Midland, Texas 79701 Offer to Purchase for Cash Up to 1,152,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share February 8, 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003. The period in which tendered shares may be purchased, and the withdrawal period, may be extended; however, only shares properly tendered for purchase by 5:00 p.m. Eastern Time, on April 8, 2003, will be purchased. Summary Term...

mechanism = FIXED...QuickLinks -- Click here to rapidly navigate through this document CAP ROCK ENERGY CORPORATION 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDMENT TO OFFER TO PURCHASE FOR CASH Up to 1,152,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share March , 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003, unless extended. 1 SUMMARY TERM SHEET Cap Rock Energy Corporation (the "Company") is offering to purchase shares of its outstanding common stock which were distributed to certain former members of Cap Rock Electric Cooperative, In...

mechanism = FIXED...)(I) QuickLinks -- Click here to rapidly navigate through this document Cap Rock Energy Corporation 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDED OFFER TO PURCHASE FOR CASH Up to 1,302,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share March , 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003, unless extended. The number of shares to be purchased is subject to the terms and conditions contained in this offer, including the amount of cash available to the Company to purchase shares. See Section 6, "Conditions of the Offe...

mechanism = FIXED...lick here to rapidly navigate through this document Exhibit 99(a)(1)(i) CAP ROCK ENERGY CORPORATION 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDED OFFER TO PURCHASE FOR CASH Up to 1,302,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share April 3, 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 30, 2003, unless extended. The number of shares to be purchased is subject to the terms and conditions contained in this offer, including the amount of cash available to the Company to purchase shares. See Section 6, "Conditions of the Of...

price = USD 10.0...Cap Rock Energy Corporation 500 W. Wall Street, Suite 400 Midland, Texas 79701 Offer to Purchase for Cash Up to 1,152,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share February 8, 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003. The period in which tendered shares may be purchased, and the withdrawal period, may be extended; however,...

price = USD 10.0...GY CORPORATION 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDMENT TO OFFER TO PURCHASE FOR CASH Up to 1,152,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share March , 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003, unless extended. 1 SUMMARY TERM SHEET Cap Rock Energy Corporation (the "Company") is offering to purchase shar...

price = USD 10.0...Energy Corporation 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDED OFFER TO PURCHASE FOR CASH Up to 1,302,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share March , 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003, unless extended. The number of shares to be purchased is subject to the terms and conditions contained in this...

price = USD 10.0...ENERGY CORPORATION 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDED OFFER TO PURCHASE FOR CASH Up to 1,302,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share April 3, 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 30, 2003, unless extended. The number of shares to be purchased is subject to the terms and conditions contained in th...

threshold = 100...Guaranteed Delivery. •The Company will purchase all other shares tendered with payment on a pro-rata basis. •Tendered shares that are unpurchased will be returned to you at our expense. Odd Lots. The term "odd lots" means all shares tendered by a shareholder who owns an aggregate of fewer than 100 shares and so certifies in the appropriate place on the Letter of Transmittal. Regardless of any delay in making payment, we will not pay interest on the purchase price. We will pay all stock transfer taxes, if any, payable on the transfer to us of shares purchased in our offer. Any tendering shareholder or other payee who fails to fully comple...

txn_type = TENDER_OFFEREX-99.(A)(1)(A) 3 a2101775zex-99_a1a.htm EXHIBIT 99.(A)(1)(A) QuickLinks -- Click here to rapidly navigate through this document Exhibit (a)(1)(A) Cap Rock Energy Corporation 500 W. Wall Street, Suite 400 Midland, Texas 79701 Offer to Purchase for Cash Up to 1,152,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share February 8, 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003. The period in which tendered shares may be purchased, and the withdrawal period, may be extended; however, o...

txn_type = TENDER_OFFEREX-99.(A)(1)(G) 3 a2104846zex-99_a1g.htm EXHIBIT 99.(A)(1)(G) QuickLinks -- Click here to rapidly navigate through this document CAP ROCK ENERGY CORPORATION 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDMENT TO OFFER TO PURCHASE FOR CASH Up to 1,152,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share March , 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003, unless extended. 1 SUMMARY TERM SHEET Cap Rock Energy Corporation (the "Company") is offering to purchase shares...

txn_type = TENDER_OFFEREX-99.(A)(1)(I) 3 a2106122zex-99_a1i.htm EXHIBIT 99.(A)(1)(I) QuickLinks -- Click here to rapidly navigate through this document Cap Rock Energy Corporation 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDED OFFER TO PURCHASE FOR CASH Up to 1,302,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share March , 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 8, 2003, unless extended. The number of shares to be purchased is subject to the terms and conditions contained in this o...

txn_type = TENDER_OFFEREX-99.(A)(1)(I) 3 a2107260zex-99_a1i.htm EXHIBIT 99.(A)(1)(I) QuickLinks -- Click here to rapidly navigate through this document Exhibit 99(a)(1)(i) CAP ROCK ENERGY CORPORATION 500 W. Wall Street, Suite 400 Midland, Texas 79701 AMENDED OFFER TO PURCHASE FOR CASH Up to 1,302,355 shares of its Common Stock, Par Value $.01 Per Share At a Purchase Price of $10.00 Per Share April 3, 2003 The offer to purchase and withdrawal rights expire at 5:00 p.m. Eastern Time, on April 30, 2003, unless extended. The number of shares to be purchased is subject to the terms and conditions contained in this...