Large Power

Rate Breakdown (Current-January 1, 2023)

Service Availability Charge $150
Peak Demand Charge per kW $6.74
Transmission Cost of Service
Pass-Through Charge per kWh
$0.01356
Temporary Winter Storm Surcharge $0.007000
Time-of-Use Base Power Cost per kWh Varies by time of use.

Your monthly bill will be the sum of the above charges plus any applicable fees.


Rate Breakdown (Beginning January 1, 2023)

Service Availability Charge $150
Peak Demand Charge per kW $6.74
Transmission Cost of Service Pass-Through Charge per kW* Updated monthly per PUCT (see below)
Temporary Winter Storm Surcharge per kWh $0.007000
Time-of-Use Base Power Cost per kWh Varies by time of use.

Your monthly bill will be the sum of the above charges plus any applicable fees.

*The demand (kW) used for this charge will be the member’s Four Coincident Peak (4CP) measurement from the previous summer. For members who do not have a 4CP established, TCOS will be charged on a kWh basis. More information below.


Transmission Cost of Service Pass-Through Charge, per kW

The Transmission Cost of Service (TCOS) Pass-Through Charge on your electric bill recovers the cost PEC incurs to access the statewide transmission system.

PEC’s transmission-access charges are based on our average system demand during the four Electric Reliability Council of Texas (ERCOT) coincidental peaks in June, July, August, and September of the previous summer, commonly referred to as the 4CP. PEC passes on the cost to use transmission infrastructure as a direct pass-through, meaning there are no additional costs added.

This means, Large Power members will have more control of how much they pay on TCOS charges. Every summer, PEC will measure each Large Power member’s 4CP demand. Then, January through December of the following year, PEC will bill for TCOS charges based on their 4CP established the previous summer. The TCOS charge will be determined by multiplying the previous summer’s 4CP by the monthly TCOS rate, per kW. The TCOS charge, per kW, will be updated monthly as pass-through costs fluctuate. Each summer, the 4CP demand will be remeasured and updated on members’ bills for the following year. Large Power members can use the formula from the graphic to easily calculate their individual TCOS Pass-Through Charge.

Large Power members yet to establish a 4CP demand will be charged for TCOS on an energy (kWh) basis until the January following their first 4CP year. The current rate is $0.01356/kWh of energy delivered, and will be updated each June and October. For details please see section 500.1.9 of the Tariff and Business Rules.

How can we lower our 4CP?

Because your 4CP is based on your actual use during peak times, you have the power to control your costs by shifting use outside of peak times. Summer peaks typically occur between 2-7:00 p.m. Sign up for 4CP forecast emails to be alerted when a potential peak day is predicted by contacting our Commercial and Industrial Accounts team at [email protected]. You can also contact them for additional information.