Wholesale vs Retail Electricity Prices in Texas

Two Markets, Two Prices

Texas has two distinct electricity markets: wholesale and retail. The wholesale market is where electricity is bought and sold between generators and providers. The retail market is where you buy electricity from a Retail Electric Provider (REP). Understanding the relationship between these two markets helps explain why electricity costs what it does.

How the Wholesale Market Works

ERCOT operates the wholesale electricity market in Texas. This market runs 24/7, with prices changing every 5 minutes in the real-time market and every hour in the day-ahead market.

Generators — natural gas plants, wind farms, solar farms, nuclear stations — submit offers to sell electricity at specific prices. ERCOT stacks these offers from cheapest to most expensive and dispatches generators until supply meets demand. The price of the last generator needed to meet demand sets the market clearing price for that interval.

This means wholesale prices are driven by:

• Demand. High demand (hot summer afternoons) means ERCOT needs more expensive generators, pushing prices up.
• Fuel costs. Natural gas prices directly affect the cost of gas-fired generation, which sets the marginal price in most hours.
• Renewable output. When wind and solar are producing heavily, they displace more expensive generators and push wholesale prices down. This is why overnight and early morning prices are often very low.
• Generator availability. If power plants are offline for maintenance or mechanical problems, the remaining generators charge more because there is less competition.

What Wholesale Prices Look Like

Wholesale prices in Texas swing wildly compared to what you pay at home:

• Off-peak hours (overnight, spring/fall): 1-4 cents per kWh
• Normal daytime hours: 3-8 cents per kWh
• Summer afternoons: 8-20 cents per kWh
• Extreme peak events: Up to $5 per kWh (the system-wide offer cap)

These swings happen because electricity cannot be stored at scale. When demand is low, there is plenty of cheap generation available. When demand peaks, expensive peaking plants come online and prices surge.

How Retail Prices Are Set

Your retail electricity rate is not simply the wholesale price plus a markup. REPs layer several costs onto the wholesale price to arrive at your rate:

Energy procurement. REPs do not just buy electricity at the real-time price. Most REPs hedge their energy costs by signing forward contracts with generators months or years in advance. This hedging costs money but provides price stability, which is how they can offer you a fixed rate.

TDU delivery charges. These regulated fees cover the cost of physical delivery and are passed through to you.

Operating costs. Customer service, billing systems, marketing, compliance, and technology all cost money to run.

Profit margin. REPs are businesses that need to earn a return.

Risk premium. The more volatile the wholesale market, the higher the risk premium REPs build into their rates to protect against losses.

Why Retail Does Not Track Wholesale One-to-One

If wholesale prices drop 50% in a given month, your fixed-rate plan does not drop 50%. Here is why:

1. Hedging smooths the curve. Your REP locked in energy costs months ago. They are paying the price they contracted for, not today’s spot price.
2. Delivery charges are fixed. TDU fees do not change with wholesale prices.
3. Contracts create a floor. Even if wholesale prices go to zero for a few hours (which happens regularly at night when wind is strong), your REP’s blended cost is much higher because they are paying contracted prices.

This works in your favor too. When wholesale prices spike to $5 per kWh during a summer afternoon, your fixed-rate plan still charges you 12 cents.

Indexed Plans: The Wholesale Shortcut

Indexed retail plans give you closer access to wholesale prices. These plans pass through the wholesale price (or a price closely tied to it) plus fees and adders. In mild months, you might pay less than a fixed-rate customer. During price spikes, your bill can be shockingly high.

Before choosing an indexed plan, understand that one bad day on the wholesale market can cost more than months of savings. During Winter Storm Uri in 2021, customers on indexed plans received bills of $5,000 or more for a single week.

What This Means for Shopping

When you shop for electricity, wholesale prices influence what is available but should not be the only thing you look at:

• If wholesale prices are low: REPs can offer attractive fixed rates. It is a good time to lock in a long-term contract.
• If wholesale prices are high: Fixed rates will be higher too. Consider a shorter contract so you can re-shop when conditions improve.
• Regardless of wholesale prices: Focus on the all-in retail rate at your kWh level on the Electricity Facts Label. That is what you actually pay.

The Bottom Line

Wholesale and retail are two different markets with very different dynamics. Wholesale prices swing wildly every few minutes. Retail prices are smoothed by hedging, delivery charges, and operating costs. For most households, a fixed retail rate offers the best balance of price and predictability, insulating you from the volatility that makes the wholesale market exciting and dangerous in equal measure.