Electricity in Round Rock

By JP Reilly, Growth · Published · Updated

Round Rock electricity is a four-month problem disguised as a year-round one. From May to September, an average household pulls 5,907 kWh — about 45% of the annual total in a third of the year¹⁴. That window — not the EFL's tidy 1,000 kWh tier¹³ — judges the plan you pick. Around 80 REPs sell into Oncor's wires here⁴; the right plan for a Round Rock household is the one that stays honest above 1,500 kWh.

Quick facts — Round Rock

Utility (TDU)
Oncor Electric Delivery
Market
Deregulated (Texas competitive market)
Avg residential usage
1,100 kWh/month
Avg residential bill
$165/month
Retail providers serving
~80 REPs (PUCT-registered)
Avg outage duration
110 minutes/year (SAIDI)
Base Power available
Yes
TDU base charge
$4/mo
TDU energy delivery
5.62¢/kWh
Round Rock city limits in dark green; surrounding ZIPs shaded as primary (predominantly inside the city) or partial (overlapping the city's edges). The address block below confirms whether any specific home qualifies for service.

About electricity in Round Rock

Cooling load drives the math. July and August daily highs average near 95°F¹; modeled household usage swings from 630 kWh in April to 1,625 kWh in August — almost entirely air conditioning¹⁴. Dell Technologies has been the city's largest employer since moving its global HQ here in 1994⁷, anchoring growth that's been among the fastest in the Austin metro for a decade. Winter Storm Uri remains the standout event, but Round Rock was one of a small set of Texas cities that did not issue a boil-water notice through the freeze⁹.

Reliability tracks the median for Texas urban utilities — Oncor's 2024 PUCT filing reports about 110 minutes of outage per residential customer annually, excluding major-event days⁶. The local failure mode is wind and equipment, not bulk-grid capacity. A March 2022 EF-2 tornado damaged ~680 Round Rock homes⁸; the February 2023 ice storm knocked out 36,000 customers locally¹⁰; the May 2024 derecho dropped 75+ poles¹¹. Most of Round Rock is on Oncor's wires¹⁵, which is the territory Base Power sells into — the address block below confirms whether any specific home qualifies.

How usage shifts across the year

MonthAvg kWhAvg high °FAvg low °F
Jan1,17762.136.3
Feb99864.839.4
Mar74571.846.6
Apr63079.854.7
May1,11186.763.7
Jun1,43192.269.9
Jul1,60795.271.7
Aug1,62596.171.3
Sep1,24490.465.3
Oct73782.255.9
Nov77171.445.5
Dec1,12563.637.2

Source: NOAA Climate Data Online (1991–2020 normals) + EIA RECS 2020 cooling-degree-day model

Local climate

Central Texas humid subtropical — July highs near 96°F drive heavy air-conditioning load through long summers, with mild winters occasionally interrupted by Arctic outbreaks.

Switch to Base Power in Round Rock

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Neighborhoods we serve

Frequently asked questions

  1. Who is my utility (TDU) in Round Rock?

    Oncor for about 96% of Round Rock¹⁵; the small remainder is Pedernales Electric Cooperative or City of Georgetown Utilities, both regulated munis. Whichever REP you sign up with handles your billing — but when the power goes out, it's Oncor that shows up.

  2. How do I switch electricity providers in Round Rock?

    Pick a plan, give the REP your service address, and ERCOT switches your meter on the next business day or your next meter-read date. Typical changeover: 1–3 days with no service interruption. The new REP coordinates with Oncor automatically. Households on the small Pedernales or Georgetown Utilities slivers can't competitively switch¹⁵ — those territories aren't deregulated.

  3. What's the average electricity bill in Round Rock?

    Modeled annual residential usage in Round Rock is ~13,200 kWh, peaking near 1,625 kWh in August and bottoming near 630 kWh in April¹⁴. At Texas's February 2026 average residential rate of 15.41¢/kWh², that runs roughly $2,000 a year. The seasonal swing pulls August closer to $250 and April closer to $95.

  4. Why does my bill go up so much in summer?

    Cooling, mostly. Round Rock's July and August averages near 95°F mean A/C runs hard for months¹. Cooling load roughly doubles monthly kWh between April's shoulder and August's peak¹⁴ — that's the half of the year when plan structure actually shows up on the bill.

  5. What's an EFL?

    An Electricity Facts Label is the one-pager every Texas REP must publish per plan, under PUCT Substantive Rule §25.475¹³. It shows the all-in rate at three usage tiers: 500, 1,000, and 2,000 kWh. Round Rock's August reality is 1,625 kWh — only the 2,000 kWh column reflects what you'll pay; the 1,000 kWh column is the one bill-credit plans optimize around. Read both — the gap between them is the plan's honesty test.

  6. Can I get a 100% renewable plan in Round Rock?

    Yes. Multiple REPs offer 100% renewable-content plans, accounted for via Renewable Energy Certificates (RECs) — one REC per MWh of qualifying generation¹², retired by the REP against your monthly usage. Plan structure (rate, term, EFL) doesn't change. Oncor delivers the same electrons over the same wires regardless of which plan you pick.

  7. What happens during a power outage in Round Rock?

    Report to Oncor (1-888-313-4747 or oncor.com) — your REP can't dispatch line crews. Most non-event Round Rock outages trace to thunderstorm wind or equipment faults⁶. Major events are the outliers: Winter Storm Uri Feb 2021⁹, the February 2023 ice storm¹⁰, the March 2022 EF-2 tornado⁸, and the May 2024 derecho¹¹.

  8. Does Base Power Company serve Round Rock?

    Yes — about 96% of Round Rock is in Oncor territory, which is where Base Power sells¹⁵. The address widget on this page checks your specific service availability in seconds; the small Pedernales Electric and Georgetown Utilities slivers can't switch competitively. Once Base confirms your address, the switch processes through ERCOT in 1–3 business days with no service interruption.

Sources

  1. NOAA NCEI Climate Data Online — 1981–2010 monthly normals, Austin-Bergstrom station (USW00013904)Retrieved
  2. EIA Open Data API v2 — Texas residential retail rate (Feb 2026: 15.41¢/kWh)Retrieved
  3. US Census Bureau — ACS 5-Year Estimates (2024 release), Round Rock city housing dataRetrieved
  4. PUCT — Directory of Retail Electric ProvidersRetrieved
  5. Oncor Tariff for Retail Delivery Service (2025 schedule, currently effective; 2026 rate case approved by PUCT 2026-04-17, new rates pending tariff filing)Retrieved
  6. Oncor 2024 PUCT System Reliability Report (IEEE 1366 SAIDI, excluding major-event days)Retrieved
  7. Williamson County Economic Development Partnership — "Dell Technologies plans $25M expansion of Round Rock headquarters" (2025-09)Retrieved
  8. NWS Austin/San Antonio — March 21, 2022 South Central Texas Tornado Event (Round Rock EF-2)Retrieved
  9. KXAN — "1 year later, how Round Rock escaped February 2021 freeze sans water outage"Retrieved
  10. NPR — "Ice storm leaves hundreds of thousands of Texans without power" (Feb 2023); Oncor restoration map citations naming Round Rock among hardest-hit citiesRetrieved
  11. Community Impact Newspaper — "Storms cause more than 15,000 outages throughout Oncor service area" (May 2024 derecho); 75+ utility poles down in Round Rock areaRetrieved
  12. ERCOT — Renewable Energy Certificate (REC) program documentationRetrieved
  13. PUCT Substantive Rule §25.475 — Information Disclosures to Residential and Small Commercial Customers (Electricity Facts Label requirements)Retrieved
  14. EIA Residential Energy Consumption Survey (RECS 2020) — West-South-Central census division (cooling-degree-day elasticity used for monthly kWh modeling)Retrieved
  15. EIA Form 861 via findenergy.com — Round Rock electricity service split (~95.77% Oncor, ~2.93% Georgetown Utilities, ~1.31% Pedernales Electric Cooperative)Retrieved