ERCOT Faces "Always Peaking Grid" Risk as Evening Demand Surges Expose System Weaknesses

Texas's power grid entered 2026 not with a clean slate, but with a reliability margin that was already stretched thin. The 2025 operating year wasn't a single test of endurance; it was a sustained, year-long strain that revealed the system's structural limits. The baseline condition was one of constant pressure, not just peak-day panic.

The data shows a grid under permanent peak load. Texas hit 85,464 MW summer peak and 77,920 MW winter peak, a pattern that signals the state is no longer a seasonal peaker. It is an "always peaking grid," where demand growth outpaced every forecast and long-range plan. This relentless pressure meant operators had to squeeze every last bit of flexibility from the system just to hold the line. As one analysis noted, the grid held through 2025 because operators squeezed every inch of flexibility out of a system running hotter, tighter, and riskier than it has ever run. That strategy, while effective in the short term, is not a sustainable model for future reliability.

A key vulnerability was exposed in the evening hours. Solar power delivered record midday output, covering over 35% of demand on peak days and providing crucial stability during heat waves. But when the sun set, the grid faced a steep cliff. The evening ramp-the surge in demand as solar fades-reached 15 to 18 GW in under two hours. This created a critical window where reserves slipped below 2,000 MW on multiple nights, bringing ERCOT uncomfortably close to emergency operations. The system's ability to manage this transition was its true stress test.

The thermal fleet, long considered the backbone of reliability, showed its cracks. Forced outage rates climbed into the 10 to 12 percent range during critical periods, and units were derated during cold snaps when they were needed most. This fleet, built for a different climate and demand profile, struggled under the new weather volatility layered on top of explosive load growth.

Storage proved its worth in 2025, helping to fill the gaps left by the evening ramp and thermal vulnerabilities. The state started the year with roughly 6.5 GW of grid scale storage, a capacity that was valuable but remains a fraction of what will be needed to manage the system's growing complexity. The bottom line is that 2025 was a warning, not a victory. The grid held, but only by operating at its absolute limit. It entered 2026 with the same weather volatility, even faster load growth, and a reliability margin that refuses to stay above the line for long.

The 2026 Forecast: Load Growth Outpacing Capacity Expansion

The grid's tightrope walk is set to continue. The forward view shows a clear imbalance: projected load growth will persistently outpace the build-out of firm capacity, keeping reliability margins in the single digits for years to come. This isn't a one-off year of strain; it's the new operating condition.

The numbers tell the story. Our Winter 2026 Reference Case Forecast projects peak load will climb from 90 GW in 2026 to 117 GW in 2031. Over that same period, firm capacity is expected to grow from 100 GW to 133 GW. On paper, capacity appears to be expanding faster. But the critical metric is the reserve margin-the buffer between available power and peak demand. The forecast shows this expansion will stretch current plans, resulting in single-digit reserve margins in 2028 and 2029. That means the system will be operating with less than 10% spare capacity during its peak hours, a level of vulnerability that leaves little room for error from weather, outages, or unexpected demand.

A major source of this pressure is the nature of the new capacity coming online. While substantial nameplate capacity is expected, much of it is solar. The problem is timing: peak demand hours are shifting into the evening, when solar output is minimal. As a result, most of the increase in ERCOT firm capacity comes from natural gas combined cycle and combustion turbine plants, along with energy storage. This mix is necessary but introduces its own challenges, from fuel supply to the reliability of newer gas fleets.

The key uncertainty in this forecast is the assumed load growth itself. The reference case already assumes that 50% of the Contract and Officer Letter Loads that ERCOT included in its Adjusted Load Forecast won't materialize. That's a significant discount to the official projection. If that load growth fails to materialize, it would ease the strain on the system and improve reserve margins. But it is not a given. The assumption is a prudent hedge, acknowledging that economic shifts, energy efficiency, or changes in adoption rates could slow growth. For now, the baseline remains a grid under sustained pressure.

The bottom line is that the 2025 stress test was a preview. The 2026 forecast confirms the system will remain in a state of tight supply and demand for the next several years. Operators will continue to squeeze every bit of flexibility, and the risk of tight conditions during extreme weather events will remain elevated.

The Water-Grid Nexus: Drought's Impact on Generation

While the grid's tight supply-demand balance is the headline story, a parallel crisis is unfolding beneath the surface: a severe drought that threatens the very water needed to generate power. This water-grid nexus is a critical, often overlooked pressure point that could amplify grid stress when it matters most.

The scale of the drought is vast. As of the latest U.S. Drought Monitor, nearly the entire state is abnormally dry and about 81.8% is in drought. Roughly half of Texas is in severe drought or worse, with significant areas facing extreme to exceptional conditions. This isn't just a regional issue; it's a statewide strain that is already impacting agriculture and municipal supplies.

The threat to power generation is most acute in South Texas, where water-intensive thermoelectric plants are concentrated. The region's primary reservoirs are critically low. Corpus Christi's combined storage in Choke Canyon Reservoir and Lake Corpus Christi stood at just 8.7% as of last week. City officials have warned they could face a water crisis by the end of the summer, a timeline that coincides with the peak power demand season. This is a direct vulnerability: thermoelectric plants, which include coal and natural gas facilities, require vast amounts of water for cooling. As reservoir levels fall, the operational risk for these plants rises.

The warning from officials is clear. A water crisis in the coastal region could directly impact local power plants, potentially forcing them to curtail output or shut down during periods of peak demand. This would shrink the available capacity just as the grid is under the greatest strain. It adds a new layer of operational uncertainty to an already stressed system, where every megawatt of firm capacity is precious.

The bottom line is that drought is not a distant weather event; it's a tangible, near-term risk to generation reliability. As the state faces persistent heat and low precipitation, the water needed to cool power plants is becoming a scarce resource. This creates a feedback loop where water scarcity could force power plant reductions, tightening the grid further and increasing the risk of reliability issues during the summer months. For ERCOT, managing the power supply balance now means also managing a water supply crisis.

Political Framing: A Candidate's Warning as a Signal

The technical analysis of grid stress and water scarcity is now meeting the political arena. Jenn Mack Raphoon, an Independent candidate for Governor of Texas, has issued urgent messages urging Texans to prepare for tight power margins and water shortages. Her campaign themes highlight the need for a more proactive approach to energy and water security, framing these issues not as distant technical problems but as immediate risks to public safety and economic stability.

This political framing is a direct response to the structural pressures identified in the grid analysis. Raphoon's warnings signal that the commodity balance issues-where supply is perpetually stretched thin against growing demand-are becoming a central election issue. They move the conversation beyond the technical jargon of reserve margins and drought indices to a broader debate about preparedness, long-term planning, and the role of government in securing essential resources.

Her candidacy underscores a growing public concern over systemic risks. When a candidate running for the highest office in the state makes energy and water security a core theme, it reflects a voter base that is increasingly aware of the vulnerabilities exposed in 2025 and projected for 2026. The political response is a clear signal that the operational challenges facing ERCOT and Texas water managers are no longer confined to utility boardrooms; they are now a matter of public policy and political accountability.

The bottom line is that Raphoon's campaign is a symptom of a larger shift. As the evidence of tight supply and demand balances becomes harder to ignore, the pressure is building for political leaders to offer solutions. The warning is not just about what might happen during a heat wave or a drought, but about the need for a more resilient and forward-looking strategy for managing Texas's most critical resources.

Catalysts and Risks: What Could Break the Balance

The baseline forecast shows a grid operating on a tightrope. The real test comes when specific catalysts trigger a supply shortfall, moving beyond the expected strain to actual reliability events. The primary threat is extreme weather, which acts as a double hit: it spikes demand while simultaneously stressing generation. A prolonged heat wave or cold snap would simultaneously push peak load higher and increase the operational risk for thermal plants, especially if water levels are critically low. This combination could force plants to curtail output, shrinking the available capacity just when it is needed most.

A key risk is that the 50% discount to projected load growth assumed in the reference case may not hold. The forecast already assumes that a significant portion of the official load growth will fail to materialize, a prudent hedge. But if that load growth does materialize, it would further tighten already single-digit reserve margins. This would compress the system's flexibility buffer, making it far more vulnerable to any disruption, from a single plant outage to a regional weather event.

Another critical risk is the pace of new firm capacity. While substantial nameplate capacity is expected, much of it is solar, which doesn't help during evening peak hours. The increase in firm capacity relies heavily on natural gas combined cycle and combustion turbine plants, along with energy storage. If the build-out of these resources fails to meet the accelerated pace needed, the gap between demand and reliable supply will widen. This is the core vulnerability: the system is counting on a rapid expansion of gas and storage to close the gap, but any delay in permitting, financing, or construction would leave the grid exposed.

The bottom line is that the system's resilience is being tested by a confluence of pressures. The catalysts are clear-extreme weather, unmet load growth assumptions, and a lag in firm capacity deployment. Each one has the potential to break the delicate balance, turning a forecast of tight margins into a reality of operational stress. For ERCOT, the path forward requires not just planning for the expected, but preparing for the specific events that could break the balance.

Practical Takeaways for Texans

The analysis of Texas's tight power and water balances points to a clear, practical conclusion: preparedness is no longer optional. For residents and businesses, the path forward requires treating official warnings as actionable signals and managing personal risk in a system under sustained pressure.

First, water conservation is a planning exercise, not just a suggestion. The recent implementation of Stage 1 drought status by the Brazos River Authority is a formal trigger. It means conditions are drying out, and the system is beginning to show strain. Residents should treat this voluntary 5% conservation target as a baseline starting point. The goal is to build habits-like running full laundry loads and turning off taps-that can be scaled up if conditions worsen. The forecast for the spring and summer months is for dry weather to intensify, making early action critical to avoid more severe restrictions later.

Second, energy management remains a shared responsibility. The grid's persistent risk of tight margins, as seen in 2025 and projected for 2026, means that demand-side actions still matter. Simple, daily adjustments-like raising thermostats a few degrees during peak afternoon hours or shifting appliance use to off-peak times-can collectively help ease the evening ramp and keep reserves above critical levels. This isn't about sacrifice; it's about participating in a system that is counting on every bit of flexibility.

Finally, the political discourse around these issues signals that long-term resilience will be a state priority. With candidates like Jenn Mack Raphoon making energy and water security a core theme, voters are demanding solutions. This focus will likely drive future policies on water infrastructure, energy storage deployment, and demand response programs. For businesses, this means staying informed about regulatory shifts and potential incentives for efficiency or on-site generation. For all, it underscores that managing these essential resources is now a central part of life in Texas, requiring both individual action and engagement with the evolving policy landscape.