Why Texas electric bills spike in summer — and how to fight back.

If your last electric bill made you do a double-take, you're not alone. Roughly 85% of Texas households see their electric bills increase by more than 60% between spring and peak summer. The average Texas household pays about $130/month in May and $245/month in August — a near-doubling driven by predictable mechanics that most providers benefit from quietly.

This guide walks through every reason your bill jumps in summer, the specific Texas-grid factors most explainer articles miss, and seven concrete moves you can make today to fight back. We won't tell you to "unplug your toaster." We're not going to suggest you stop using your AC. We will tell you what actually moves the needle — and what doesn't.

The short version

Five things stack up to make your summer bill huge:

1. Your air conditioner runs 3-4x longer per day than in mild months. This alone accounts for ~70% of the bill increase.
2. Your TDU charges may be higher in summer months. Some delivery companies have seasonal rate adjustments.
3. If you're on a variable-rate plan, your energy rate itself may have spiked with the grid — sometimes 40-60% higher than your winter rate.
4. Bill credit plans punish you if your usage drifts outside their narrow credit window — typically 1,000 to 2,000 kWh per month.
5. ERCOT wholesale prices peak in late afternoon. If you're on a time-of-use plan, those 4-7pm hours are eating you alive.

Now let's break each one down in detail.

1. Your AC is doing 70% of the damage

For most Texas homes, air conditioning accounts for 50-60% of summer electricity usage. The math is brutal and predictable.

A typical 3-ton central AC unit (sized for a ~1,800 sq ft Texas home) uses about 3,500 watts per hour of operation. In spring and fall, that AC might run 4-6 hours per day. In July and August in Houston, Dallas, or Austin, the same AC runs 12-16 hours per day.

This is why every "lower your summer bill" article eventually circles back to AC. It's not a small lever — it's basically the whole bill. Smart thermostats, attic insulation, and shade matter precisely because they reduce AC runtime.

The 78°F rule

The U.S. Department of Energy recommends 78°F when home and awake, 82°F when sleeping or away. Every degree below 78°F adds roughly 6-8% to your cooling cost. A house cooled to 72°F vs 78°F costs about 40% more to run.

This sounds austere if you're used to 72°F. The fix isn't suffering at 78°F — it's using ceiling fans (which use ~70 watts vs 3,500 for the AC) to create perceived cooling. A ceiling fan can make a 78°F room feel like 73°F. The fan only helps when you're in the room, so use them strategically.

2. Your TDU may be charging more in summer

In Texas's deregulated electricity market, your bill has two pieces: the energy charge (paid to your Retail Electric Provider, or REP) and the delivery charge (paid to your Transmission and Distribution Utility, or TDU). The TDU is the company that owns the poles and wires.

You don't choose your TDU — it's determined by where you live. Most Texans are served by one of four:

TDU	Primary Service Area	Approx. summer rate
Oncor	DFW, North Texas, Tyler, Waco	~4.27¢/kWh + $5.25 monthly
CenterPoint	Houston, Galveston	~4.78¢/kWh + $4.39 monthly
AEP Texas Central	Austin suburbs, Corpus Christi, McAllen, Laredo, Rio Grande Valley	~4.97¢/kWh + $5.94 monthly
AEP Texas North	Abilene, San Angelo, West Texas	~5.18¢/kWh + $5.94 monthly

The Public Utility Commission of Texas reviews and approves TDU rates periodically. Some TDUs have seasonal differentials, others don't. As of 2026, most Texas TDU rates are roughly flat year-round, but recent rate cases have approved increases that take effect — surprise, surprise — at the start of summer.

The TDU portion of your bill isn't shoppable. You can't pick CenterPoint over Oncor based on price. But knowing your TDU's exact rate lets you check whether your REP is gouging you on the energy side.

3. Variable-rate plans get destroyed in summer

If you're on a variable-rate plan ("month-to-month" with no fixed energy rate), summer is when you find out how exposed you are.

Variable rates are tied to ERCOT's wholesale electricity market. ERCOT prices spike when demand outstrips supply — which is to say, every hot afternoon in Texas. In a typical summer week, wholesale electricity can swing from 3¢/kWh at 4am to 50¢/kWh at 5pm. Variable plans pass much of that volatility through to you.

Real example: in August 2023, some Texans on variable-rate plans saw bills 3-4x normal. In 2024, the average variable-rate customer paid about 22¢/kWh in August, vs. 12¢/kWh in March. That's the entire bill increase, on top of the AC usage increase.

4. Bill credit plans: the summer trap

A "bill credit" plan looks great at first. The pitch: "Use 1,000 kWh in a month, get a $100 credit." On paper, that drops your effective rate to a number like 8.5¢/kWh — which is why these are heavily advertised.

The trap: the credit only triggers in a narrow usage window, typically 1,000-2,000 kWh. Use less than that window — say, 980 kWh — and you lose the credit entirely. You're now paying the unsubsidized rate, which is often 15-18¢/kWh.

In summer, your usage almost certainly exceeds 1,500 kWh. So during peak months, bill credit plans often work fine. But the Texan who signed up in March expecting a fall/winter savings is now using 500 kWh in mild months — and pays the full unsubsidized rate. Their "8.5¢ plan" effectively costs them 16¢ for half the year.

This isn't an accident. It's the design.

5. ERCOT's late-afternoon peak hours

ERCOT (the grid operator for most of Texas) sees its highest demand each day between roughly 3pm and 8pm. That's when residential AC, commercial cooling, and industrial load all hit at the same time. Wholesale prices during this window can be 10-20x what they are at midnight.

If you're on a time-of-use (TOU) plan or a "free nights" plan, this matters a lot. Free nights plans give you free electricity from, say, 8pm-6am — but charge an inflated rate during the day to make up for it. If you're at home using AC during the 3-7pm peak (which is when AC works hardest because it's hottest), you're paying that inflated rate during the most expensive hours.

Free nights plans only save money if you can systematically shift your usage to off-peak: laundry at 11pm, dishwasher at midnight, EV charging overnight, and AC scheduled to pre-cool the house at 1pm so it can coast through the afternoon. Without that discipline, you're a free nights victim.

The 7 moves that actually work

Now the practical part. Here's what actually moves the needle, ranked by impact-per-effort.

1. Lock in a fixed-rate plan now, not in August

Plans purchased in March-April are typically 10-20% cheaper than the same plan offered in July. ERCOT's forward-curve pricing means winter contracts are cheaper. If you're still on month-to-month past June, you're bleeding money.

If you missed the spring window, switching today is still better than auto-renewing into August. Use our plan comparison tool to find the cheapest fixed-rate plan in your ZIP.

2. Raise your thermostat 2-3°F, use fans

Going from 72°F to 76°F (with ceiling fans running in occupied rooms) can cut your AC usage by 25-30%. That's $40-60 in monthly savings for the average Texas household. Highest impact per zero dollars spent.

3. Install a smart thermostat (one-time ~$120)

Nest, Ecobee, and Honeywell smart thermostats pay for themselves in 4-6 months in Texas summers. They learn your schedule, pre-cool, and schedule setbacks when you're away. Average savings: 10-15% off AC costs, or $25-40/month in summer.

4. Audit your "energy hogs"

After AC, the biggest summer energy users are: pool pumps (if you have one), old refrigerators, electric water heaters, and laundry dryers. Our usage estimator walks through each appliance and shows you the monthly kWh and dollar cost of each. People are usually shocked by the pool pump number.

5. Move heavy usage to off-peak hours

Don't run laundry or dishwasher between 3pm-8pm. Schedule them for 10pm or 6am. If you have an EV, charge overnight. These shifts are free and save 8-12% off your bill on any plan that prices by time-of-use.

6. Get a free bill audit

Send us your last bill and we'll tell you exactly which of these factors is hitting you hardest. Free, takes 10 minutes. We're not affiliated with any REP — we just look at your numbers and tell you what we'd do.

7. Don't get talked into a long-term variable plan

If a sales rep tries to sign you up for a "flexible" or "month-to-month" plan in June, they're not doing you a favor. You want a fixed-rate plan with a contract length you're comfortable with (12-24 months for most people). Lock in your rate. Don't expose yourself to ERCOT volatility.

City-specific summer notes

Some Texas cities feel summer worse than others — partly because of climate, partly because of TDU charges. A quick tour:

Houston

Houston combines high humidity with high heat, which makes ACs work harder per degree. Houston bills typically run 10-15% higher than Dallas bills at equivalent usage. Houston-specific plans and rates →

Dallas / Fort Worth

DFW has the lowest TDU rates in deregulated Texas (Oncor). Your delivery charges are lower than Houston or Austin, but August temperatures often exceed Houston, leading to similar bill spikes from AC load. Dallas plans → · Fort Worth plans →

Austin and San Antonio

Note: both Austin proper and San Antonio proper are mostly served by municipal utilities (Austin Energy, CPS Energy) and are NOT in the deregulated market. The surrounding suburbs (Cedar Park, Round Rock, New Braunfels, Schertz) often are. Check your address before assuming you can shop.

Corpus Christi, McAllen, Laredo

Coastal and South Texas summers are brutal but slightly more humid-dominant. AEP Texas Central handles delivery for most of this region. See live rates by city →

The bottom line

Texas summer electric bill spikes aren't random — they're the predictable result of AC load + grid economics + plan structures most providers count on you not understanding. The good news: every single mechanism above is addressable.

Five minutes locking in a fixed rate before summer hits beats six months of "thermostat discipline" later. Twenty minutes using the comparison tool today saves you $300-500 over the coming summer for most Texas households.

If you don't know where to start: use our bill diagnostic tool. Five questions, one clear diagnosis of what's eating you. Free, no signup.