CPS Energy in a San Antonio Summer: What to Budget for July and August

If you signed a lease in spring and your April CPS Energy bill was $85, expect July and August to land between $180 and $350 for the same apartment or small house. That is the normal range for a Bexar County summer, not an anomaly, and it is almost entirely air conditioning. Budget for it up front or it will blow a hole in the rent-plus-utilities math you did before move-in.

CPS Energy is the municipally owned electric and gas utility for San Antonio and most of Bexar County. It is not regulated by the Public Utility Commission the way Oncor or CenterPoint territories are, and you do not pick a retail provider. There is one rate schedule, set by the CPS board and city council, and every residential customer is on it.

Why July and August hit so much harder than June

San Antonio averages 95–99°F highs in July and August, with heat-index readings regularly above 105°F and overnight lows that often stay in the upper 70s. That last part is what eats the bill. Your AC is not just fighting the afternoon peak; it never gets a cool-night recovery the way it does in May or October. A 1,200-square-foot apartment that used 600 kWh in April will commonly use 1,400–1,800 kWh in August running the same thermostat setting.

CPS also bills on a seasonal structure. The residential rate has a higher per-kWh charge during the summer billing cycles (roughly June through September) and an additional tier that kicks in above a threshold of monthly usage. So you are paying more per kWh and using more kWh. Both levers move the wrong way at once.

How the CPS residential rate is actually built

A residential electric bill from CPS has several line items. The ones that move with usage:

• Customer charge — a flat monthly fee regardless of usage.
• Energy charge — cents per kWh, with a summer rate and a non-summer rate.
• Tiered summer adder — kWh above a set monthly threshold bill at a higher rate during summer months.
• Fuel adjustment — a pass-through that changes monthly based on natural gas and purchased-power costs. This line has been the single biggest swing factor in the last few years.
• Regulatory and city fees — small but present on every bill.

Exact cents-per-kWh figures change with board-approved rate adjustments and the monthly fuel factor, so pull the current numbers from cpsenergy.com before you build a tight budget. What matters for planning: the effective rate you pay in August is meaningfully higher than what you paid in February on the same meter.

What actually drives the number

For almost every renter, the summer bill is an AC bill. Cooling is typically 60–70% of July and August usage in San Antonio. The rest is water heating, refrigerator, laundry, and everything plugged in. A few things move the needle hard:

• AC age and SEER rating. A 15-year-old 10-SEER system in a 1980s Northwest-side rental will use roughly 40–50% more electricity than a modern 15-SEER unit cooling the same space to the same temperature.
• Ductwork and attic insulation. Leaky returns in an unconditioned attic are the classic San Antonio energy leak in older NEISD-area and SAISD-area rentals.
• Windows and sun exposure. West-facing single-pane windows in a Stone Oak townhouse or a Southtown bungalow will add $30–$60 a month in July versus a shaded unit.
• Thermostat setpoint. Every degree lower on the thermostat adds roughly 6–8% to cooling cost in this climate. The gap between 72°F and 78°F across a month is real money.
• Pool pump, if the rental has one. A single-speed pool pump running eight hours a day can add 200–300 kWh on its own.

The deposit when you start service

CPS can require a deposit to open residential service. Whether you pay one depends on credit check results and whether you can produce a letter of credit from a prior utility showing 12 months of on-time payment. Deposits commonly run in the low-to-mid hundreds for an average apartment and are refunded (with interest) after a set period of on-time payments or when you close the account in good standing.

If you are moving from out of state and have no Texas utility history, request the letter of credit from your previous utility before you leave. It is free and it often eliminates the deposit entirely. Roll this into your move-in cost stack along with your SAWS start-service fees (SAWS is separate — water and sewer only, not electric) and your renters insurance first payment.

Payment tools CPS actually offers

Before the first $300 bill surprises you, set these up:

• Budget Payment Plan (average billing). CPS averages your last 12 months of usage and bills that flat amount, with a true-up. This is the single most useful tool for renters who cannot absorb a July spike. You need roughly a year of history at the address for it to be accurate; new customers get an estimate.
• Auto-pay. Avoids late fees, which are not large but not zero.
• Payment arrangements. If a bill lands that you cannot pay in full, call before the due date and split it across the next one or two cycles. This is routine and does not ding your account as long as you stay on the schedule you agree to.
• Residential Energy Assistance Partnership (REAP) and Project Cool. Income-qualified bill assistance, funded in part by customer donations on bills. Apply through CPS's assistance portal or through partner agencies like the City of San Antonio Department of Human Services.
• Casa Verde Weatherization. Free weatherization (insulation, duct sealing, some equipment) for income-qualified customers. As a renter you need the owner's written consent, which is often gettable because the improvements stay with the property.

What most people get wrong

• Treating the lease's quoted "average utilities" as a monthly number. Property managers often quote a yearly average. Your July bill will be 2–3x that figure. Budget to the peak month, not the average.
• Assuming CPS and SAWS are one bill. They are separate utilities with separate accounts, separate deposits, and separate due dates. Set up both before the move-in date.
• Cranking the thermostat down to 68°F expecting faster cooling. The AC does not cool faster at a lower setpoint; it runs longer. In a 1990s NISD-area rental with a marginal system, that setpoint will add $40–$80 to the August bill without making the house meaningfully more comfortable at 4 p.m.
• Ignoring the fuel adjustment line. It is not fixed. In recent cycles it has swung enough to change a bill by 10–15% month to month. If your budget is tight, look at this line, not just kWh.
• Waiting until the disconnect notice to call. CPS will work with you on a payment plan before you are delinquent. After a disconnect notice the options narrow and reconnection fees apply.
• Expecting the landlord to fix a failing AC because the bill is high. Texas Property Code § 92.052 requires landlords to repair conditions that materially affect health or safety, and in Texas heat a non-functioning AC usually qualifies — but an inefficient working AC does not. A 12-SEER unit from 2005 that cools to 76°F is not a repair issue, it is a rental-selection issue. Check the condenser's manufacture date during the walkthrough.

What a renter can actually change

You cannot replace the condenser, reinsulate the attic, or swap the windows. You can:

• Run ceiling fans in occupied rooms and turn them off when you leave (fans cool people, not rooms).
• Set the thermostat to 78°F when home, 82°F when away, using a programmable or smart thermostat if the system supports it. Most do.
• Replace the AC filter every 30–45 days in summer. A clogged filter measurably raises usage.
• Close west-facing blinds from roughly 2 p.m. to sunset.
• Run dishwasher, dryer, and oven after 9 p.m. — less heat dumped into the house during peak cooling load.
• Ask the landlord, in writing, whether Casa Verde work has ever been done on the unit. If not, and you qualify, start that conversation early in the lease.

Before you sign the lease

Ask the current or prior tenant, or the property manager, for the July and August CPS bills from the last two years. Reasonable landlords will share a redacted copy; unreasonable ones will not, which is itself information. A 1,100-square-foot apartment with summer bills consistently over $250 is telling you something about the envelope and the equipment that the listing photos are not.

If you are still comparing units, RentInSA's listings at /rentals let you filter by neighborhood and property type across Bexar County, and the affordability pieces under /resources cover the rest of the move-in stack — SAWS, deposits, renters insurance, and the real monthly number — so July does not become the month the budget breaks.