Then your son is getting ripped off. I too live in Texas. I keep my 2100 square foot home at a cool 69°, and my August bill was $105. Tell him to go to www.powertochoose.org That is literally all that I did. He can choose a company and a plan to meet his needs. I pay about 6.7¢ per kW. It is possible that he is in a subdivision that does not allow people to choose their electrical provider, but without deregulation I would still be paying more than twice what I am now. The water bill, on the other hand......
I second that. Powertochoose.org. You can get around 8 cents per mgwh. I have a 3200 square foot house that I keep around 75. My highest bills are less than $300 in the summer. Much less in winter.
My bill to water my one-acre lot was $500 in August. It is now burning as I have given up waiting on rain and turn it on every third day to water the bushes. It will go dormant in a month anyway.