Constellation
12 Month (No Min Usage Fee)
Rate
14.30¢
Term
12 Months
$1000 kWh
$143
Rates as of July 2026 · verify on the EFL
- ✓ 30% green
Best for Reliability Constellation in Markham
Constellation in Markham.
Constellation has 3 plans live on the Oncor grid serving Markham. Lowest rate 14.30¢/kWh.
3.9 · Oncor grid · Matagorda County
Constellation in Markham
By the numbers.
Lowest here
14.30¢
Constellation in Markham
Markham avg
14.72¢
across all providers
Constellation plans
3
on Oncor
100% green
0
renewable plans
What you actually pay in Markham
Energy charge vs the wires.
Constellation's cheapest plan in Markham is 14.3¢/kWh all-in. That number is two parts: Constellation's energy charge, plus the Oncor delivery charge — the cost of the poles and wires, set by the PUCT and identical on every plan from every provider on this grid.
Constellation energy
10.1¢
Oncor delivery
4.2¢
All-in
14.3¢
At a typical 1,000 kWh month, that's about $143 — including the ~$3.42 Oncor meter charge. Because delivery is fixed, the only lever between providers in Markham is the energy charge. Constellation's best rate ranks #12 of 18 providers on the Oncor grid.
Top Constellation picks for Markham
Best Constellation plans here.
Constellation
12 Month GREEN (No Min Usage Fee)
Rate
15.30¢
Term
12 Months
$1000 kWh
$153
Rates as of July 2026 · verify on the EFL
- ✓ 30% green
Constellation
12Mo Usage Bill Credit + A/C Protection for 2 Units and HVAC Monitoring
Rate
15.30¢
Term
12 Months
$1000 kWh
$153
Rates as of July 2026 · verify on the EFL
- ✓ 30% green
Markham, Matagorda County, sample ZIP 77456. Served by Oncor (outage line: 1-888-313-4747).
Switching in Markham
Same wires — new bill from Constellation.
Oncor owns the wires in Markham and processes the switch in 1-3 business days — no service interruption, no truck roll, no new equipment. Constellation files the switch on your behalf. Same-day if you order before 4-5 PM Central.
Constellation in Markham — FAQ
Common questions.
Does Constellation serve Markham, TX?
Yes. Constellation offers 3 plans in Markham on the Oncor grid, starting at 14.3¢/kWh all-in. Enrollment is online and service is delivered by Oncor.
What's the delivery charge in Markham?
Oncor charges about 4.2¢/kWh plus ~$3.42/month to deliver power in Markham. This is set by the PUCT and is identical on every plan — from Constellation or any other provider — so the only number that actually differs between providers is the energy charge.
Where does Constellation rank on price in Markham?
Constellation's lowest Markham rate ranks #12 of 18 providers serving the Oncor grid. The cheapest plan overall in Markham is 7.1¢/kWh; Constellation's best is 14.3¢/kWh.
How long does it take to switch to Constellation in Markham?
1 to 3 business days. Oncor keeps delivering power the whole time — no interruption, no new meter, no truck roll. Order before roughly 4–5 PM Central on a weekday and same-day switching is usually available.
More on Constellation
Explore Constellation.
Compare Constellation plans in Markham
See how Constellation's 3 plans stack up at your real Markham usage.
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How enrollment works
You pick the plan here. Enrollment finishes on our secure checkout — same rate, no markup. If you'd rather skip the ZIP entry, Live Link pulls your real usage from Smart Meter Texas in about 30 seconds. Same plans, same checkout, less typing.