What is 4CP and how can Texas businesses reduce 4CP charges?

Four‑coincident‑peak (4CP) transmission charges are a direct result of how ERCOT allocates the cost of moving power across the grid during the most stressed moments of the summer. In plain terms, the four 15‑minute intervals with the highest system‑wide load between June and September become the benchmark for the next year’s transmission component of a commercial or industrial (C&I) electric bill. If your facility is drawing significant kilowatts during any of those intervals, a proportionate share of the transmission budget is added to your bill, often amounting to tens of thousands of dollars.

Reducing 4CP is not a vague “save energy” exercise; it is a focused demand‑management program that targets the exact minutes when the grid is most expensive to serve. By using predictive analytics, shifting non‑essential processes, and, when appropriate, curtailing load during the identified peaks, a Texas business can lower its transmission charge share while maintaining overall productivity. United Power Group (UPG) leverages a free Energy Health Check, 25+ years of ERCOT experience, and a panel of 30+ top‑tier suppliers to help clients achieve up to a 27% reduction in total energy spend, which frequently includes a 10‑15% cut to 4CP exposure.

Understanding the 4CP methodology

How ERCOT selects the four peaks

ERCOT publishes the Annual Transmission Cost Allocation (ATCA) after the summer of 2023. The process is:

1. Collect 15‑minute LMP data for the entire ERCOT footprint from June 1 to September 30.
2. Identify the four system‑wide intervals with the highest total load (measured in MW). These are the “coincident peaks.”
3. Lock the timestamps – they are the same for every participant in the market for the next calendar year.

The four peaks typically fall in late July and early August, when air‑conditioner demand and heat‑related generation stress the transmission system. The exact timestamps are posted on the ERCOT website and referenced by the Public Utility Commission of Texas (PUCT) in its transmission cost allocation rules.

How charges are calculated

Each TDSP (Oncor, CenterPoint, AEP Texas, TNMP) receives the ATCA and allocates a portion to its customers based on the formula:

Customer 4CP Share = (Customer kW during Peak Interval ÷ Total kW in System during Same Interval) × Total ATCA Transmission Cost

Because the denominator is the same for every customer, the numerator – your site’s kilowatt draw during those four 15‑minute windows – drives the result. The charge appears on the monthly bill as a separate line item, often labeled “4CP Transmission Charge.”

Strategies to lower your 4CP

Predictive analytics and UPG’s Energy Health Check

UPG’s free Energy Health Check reviews your historic bill, TDSP delivery‑charge audit, and demand profile. Using ERCOT’s LMP forecasts and our in‑house load‑prediction engine, we can pinpoint which of your processes are likely to run during the four peak intervals. For many of our 8,000+ business customers, early identification alone reduces 4CP exposure by 5‑10% because they can adjust schedules before the summer rush.

Load shifting and demand response

The most cost‑effective lever is to move discretionary load out of the peak windows. Common tactics include:

• Rescheduling batch processes (e.g., metal finishing, chemical mixing) to early morning or late evening.
• Pre‑cooling or pre‑heating the facility during off‑peak hours so HVAC systems draw less during the peaks.
• Participating in ERCOT‑approved demand‑response programs such as the Emergency Response Service (ERS) or the Load Resource (LR) market, where you receive a payment for reducing load during system emergencies.

When you enroll in a demand‑response event, the reduction is recorded in the same 15‑minute interval that ERCOT uses for 4CP, directly lowering your share of the transmission cost.

On‑site resources and curtailment

If your operation already has on‑site generation (solar, natural‑gas turbine) or storage, you can dispatch those resources during the four peak intervals. The key is to have a control system that can respond within the 15‑minute window. UPG works with engineering partners to design automated curtailment scripts that trigger when the ERCOT real‑time LMP exceeds a pre‑set threshold, typically $70/MWh for wholesale power.

When 4CP reduction isn’t worth the operational pain

Not every facility benefits from aggressive 4CP management. Consider the following signals:

• High load factor (>85%) – your plant runs near capacity continuously, leaving little discretionary load to shift.
• Critical process timing – if a production line must run at a specific time for product quality, the cost of rescheduling may outweigh the transmission savings.
• Limited demand‑response eligibility – some REPs (Retail Electric Providers) do not offer 4CP‑specific demand‑response contracts, making participation costly.

In those cases, a better ROI may come from negotiating a fixed‑rate block contract or focusing on wholesale power price hedging rather than chasing a marginal 4CP reduction.

Implementation checklist

1. Run the free Energy Health Check – get a baseline of current 4CP exposure.
2. Map the four peak timestamps – download ERCOT’s ATCA schedule.
3. Identify shiftable loads – use UPG’s load‑prediction dashboard.
4. Select a demand‑response program – work with your REP or a third‑party aggregator.
5. Configure automated curtailment – integrate with SCADA or building management system.
6. Monitor and verify – compare monthly 4CP line items to pre‑implementation baseline.

Bottom line

4CP charges are a predictable, data‑driven component of Texas transmission costs. By understanding the ERCOT peak selection process, leveraging UPG’s Energy Health Check, and applying targeted load‑shifting or demand‑response, most C&I customers can shave 10‑15% off their transmission bill without compromising operations. When the operational burden outweighs the savings, focus on broader procurement strategies such as fixed‑rate contracts, where UPG’s 30+ supplier panel can deliver up to a 27% overall spend reduction.