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November 20, 2024

MISO Utilities Float New Load Forecasting Approach

By Amanda Durish Cook

A new stakeholder-led proposal would require MISO load-serving entities to develop a 20-year base load forecast that includes monthly predictions for energy and non-coincident peaks.

The Coalition of Utilities with an Obligation to Serve in MISO (CUOS), an ad hoc group of MISO utilities and regulators, advanced the plan after the RTO earlier this month requested stakeholder ideas for improving load forecasting.

LSEs must currently provide just two years of monthly forecast data to MISO, but WPPI Energy economist Valy Goepfrich said long-term forecasts the RTO obtains from the Purdue University State Utility Forecasting Group — which are compared against LSE projections — so far “have confirmed the validity of the LSE base load forecasts.”

Under the CUOS plan, the LSEs’ base load forecasts would be applied to MISO’s base case Transmission Expansion Plan (MTEP) future, the “limited fleet change” future. The other futures include a continued fleet change future, an accelerated fleet change future and a future in which distributed and emerging technologies become more widely used in the MISO footprint.

“The CUOS proposal is leveraging the forecasts that LSEs already develop,” Goepfrich explained during a Sept. 26 Planning Advisory Committee meeting. She said the proposal is more cost-effective than continuing to pay Purdue for independent load forecasting.

MISO Planning Advisory Committee in June | © RTO Insider

The CUOS proposal would also direct LSEs to provide data on transmission losses, as well as demand served by energy efficiency planning resources, demand resources and behind-the-meter planning resources. LSEs would not be required to provide numbers on demand served by energy efficiency programs and other resources not classified as planning resources. Goepfrich said MISO can continue to use consulting firm Applied Energy Group for distributed resource data predictions in the three other MTEP futures.

The Parable of the Ox

miso lse load-serving entities load forecasting
Trip Doggett at the MISO Market Symposium in August | © RTO Insider

Goepfrich referenced an address at this year’s MISO Market Symposium in which RTO Director Trip Doggett cited “The Parable of the Ox,” a story included in James Surowiecki’s book “The Wisdom of Crowds.” The story recounts how in 1906, statistician Francis Galton studied a competition to guess the weight of an ox at a country fair, observing the average guess was accurate to within 1% of the actual weight of the 1,200-pound animal. Doggett used the story to illustrate that the RTO’s large stakeholder community is needed to lend their ideas about what shape the future grid should take.

Goepfrich said the story also applies to load forecasting. An average of many forecasts, she said, will be more helpful than a forecast designed by a few individuals.

“It doesn’t make sense to have a forecast that is divorced from the LSEs’ forecasts,” Goepfrich said. She added that MISO should be more transparent about the “behind the scenes” analyses that might lead it to prefer an independent load forecast over one originated by LSEs.

MISO Director of Planning Jeff Webb said the RTO will evaluate and respond to the load forecast proposal. The RTO committed to soliciting stakeholder opinions on load forecasting after taking a break this summer from ordering more independent load forecasts from Purdue. (See MISO Looks to Members for Load Forecasting Ideas.)

Facing widespread stakeholder disapproval, MISO in June abandoned a proposal to have its 140-plus LSEs annually assemble four distinct 20-year load forecasts with hourly load shapes to align with each of the four futures in the annual MTEP. (See MISO Nixes LSE Load Forecast Plan.)

FERC Upholds PJM TOs’ Supplemental Project Rules

By Rich Heidorn Jr.

FERC on Wednesday rejected a rehearing request over PJM Transmission Owners’ revised processes for planning supplemental projects, ruling it in compliance with Order 890.

The commission denied a request by American Municipal Power, Old Dominion Electric Cooperative and others seeking rehearing of the commission’s Feb. 15, 2018, ruling that the TOs’ processes for developing supplemental projects fell short of Order 890’s transparency and coordination requirements. FERC also approved PJM’s and the TOs’ compliance filing in response to the February ruling (ER17-179, EL16-71-002).

PJM’s Transmission Replacement Processes Senior Task Force meets earlier this year. | © RTO Insider

PJM stakeholders have long complained about the rules involving supplemental projects — transmission expansions or enhancements not required for compliance with PJM system reliability, operational performance or economic criteria. TOs can develop, build and seek reimbursement for such projects without the approval of PJM, which only reviews them to ensure they don’t harm reliability.

The Feb. 15 order approved a proposal to move the TOs’ process for planning supplemental projects from the Operating Agreement to Attachment M-3 of the Tariff but required PJM and the TOs to make changes to the attachment and the OA. (See FERC Orders New Rules for Supplemental Tx Projects in PJM.)

The commission said the rehearing request “largely repeats arguments” made earlier in the docket. “We are not persuaded that the commission erred in the February 15 order, which we believe appropriately responds to these concerns.”

AMP, ODEC and others argued the commission erred in permitting Attachment M-3 because it circumvented the division of filing rights in PJM, including the supermajority vote of the Members Committee required for changes to the Operating Agreement. They also said the commission should have required the TOs to respond to stakeholder comments under the supplemental process.

“Order No. 890 requires that stakeholders be afforded the opportunity to provide meaningful input, and that public utility transmission providers ‘craft a process that allows for a reasonable and meaningful opportunity to meet or otherwise interact meaningfully,’” the commission said. “Its requirements are not so prescriptive as to dictate whether and how the PJM Transmission Owners must respond to that input. While we encourage the PJM Transmission Owners to be as responsive as possible to stakeholder comments, we also realize that not all comments may require answer.”

In addition to AMP and ODEC, those seeking rehearing and challenging the March 19 compliance filing were the Delaware Division of the Public Advocate, PJM Industrial Customer Coalition, Illinois Citizens Utility Board, Office of the People’s Counsel for the District of Columbia and Public Power Association of New Jersey, which FERC named the “Load Group.”

“The Load Group’s requests for various additional provisions go beyond what the commission required in, and constitute requests for rehearing of, the February 15 order,” the commission said. “We therefore find these requests to be outside the scope of the compliance proceeding, and were we to consider them as requests for rehearing, would deny them.”

FERC OKs New MISO Retirement Process

FERC on Tuesday approved MISO’s plan to replace its retirement notification process with a more general three-year generation suspension period.

MISO’s proposal places all generation owners submitting an Attachment Y retirement notice into a catch-all three-year suspension period, with suspended units maintaining interconnection rights for the full three years unless they formally decide to retire (ER18-1636). Units that do not return to service after three years are presumed retired and their interconnection rights dissolved. The changes became effective July 16, 2018.

miso retirement Attachment Y
| MISO

After FERC issued a July deficiency letter on the proposal, MISO said the new suspension process would still allow it to designate resources seeking suspension as system support resources needed to keep operating for reliability reasons. (See FERC Seeks Details on Proposed MISO Retirement Rules.) The RTO also explained its old suspension process wasn’t working as intended, saying that out of 77 suspensions over the last five years, only eight generators returned to service at the end of the originally designated suspension period.

For modeling purposes, MISO will treat approved suspensions as unavailable resources with no specified date of return service. MISO also said its proposal requires no notice from a generation owner should it want to change its suspension status into a permanent retirement anytime during the three years.

FERC said MISO’s proposal that modeling not anticipate suspended units will return to service “better reflects the inherent uncertainty of planning.”

” … We agree with MISO that its current requirement to provide a return-to-service date in Attachment Y Notices to suspend may at times create an illusion of certainty that does not actually exist,” the commission said.

— Amanda Durish Cook

Appeals Court Upholds NY Nuclear Subsidies

By Rich Heidorn Jr.

The 2nd U.S. Circuit Court of Appeals on Thursday upheld New York’s zero-emission credits (ZEC) for nuclear generation, rejecting claims they intrude on FERC jurisdiction (172654cv).

“We conclude that the ZEC program is not field preempted, because plaintiffs have failed to identify an impermissible ‘tether’ under Hughes v. Talen Energy Marketing between the ZEC program and wholesale market participation; that the ZEC program is not conflict preempted, because plaintiffs have failed to identify any clear damage to federal goals; and that plaintiffs lack Article III standing as to the dormant Commerce Clause claim.”

In upholding a district court’s dismissal of the complaint by the Electric Power Supply Association and others, the appellate court said its finding was “consistent” with the 7th Circuit’s Sept. 13 ruling upholding Illinois’ own ZEC program. (See 7th Circuit Upholds Ill. ZEC Program.)

EPSA on Thursday asked the 7th Circuit to rehear its ruling, alleging the court had made legal and factual errors. “The panel overlooked or misapprehended three key legal arguments under which appellants would prevail,” EPSA said.

Threading the Needle

The New York Public Service Commission created the ZEC program in August 2016 as part of its Clean Energy Standard (CES), which set a goal of reducing greenhouse gas emissions by 40% by 2030. The PSC said it crafted the program to avoid the issues behind the Supreme Court’s April 2016 ruling in Hughes v. Talen, which voided Maryland regulators’ contract with a natural gas plant as an intrusion into federal jurisdiction over wholesale power markets. (See NY Attempts to Thread Legal Needle with Clean Energy Standard, Nuke Incentives.)

The court said that ZECs, like renewable energy credits (RECs), are certifications of an energy attribute separate from the purchase or sale of wholesale energy. Although the ZEC program “exerts downward pressure on wholesale electricity rates, that incidental effect is insufficient to state a claim for field preemption under the FPA [Federal Power Act],” the court said.

The court said the PSC avoided the defects of the Maryland contract for differences, which required the generator to participate in PJM’s capacity market.

“Plaintiffs point to nothing in the CES Order that requires the ZEC plants to participate in the wholesale market,” the court said. “ … As the district court concluded, a generator’s decision to sell power into the wholesale markets is a business decision that does not give rise to preemption concerns.”

“Until 2019, the ZEC price cannot vary from the social cost of carbon, as determined by a federal interagency workgroup. After 2019, the ZEC price is fixed for two‐year periods, and does not fluctuate during those periods to match the wholesale clearing price,” the court said.

The court also said the ZEC program was permissible under the dual federal/state regulatory system over electricity because it “does not cause clear damage to federal goals.”

The PSC approved the program to prevent the premature retirements of three New York nuclear power plants, Exelon’s FitzPatrick, Ginna and Nine Mile Point.

Nine Mile Point Nuclear Plant | Constellation Energy Nuclear Group

EPSA and the other plaintiffs — the Coalition for Competitive Electricity, Dynegy, Eastern Generation, NRG Energy, Roseton Generating and Selkirk Cogen Partners — claimed they were harmed because the ZEC program allows “favored New York power plants to prevail in interstate competition against” their generation by underbidding them in the wholesale electricity markets.

“If the PSC awarded ZECs in a non‐discriminatory manner to out‐of‐state nuclear plants (as it may do in the future under the terms of the CES order), there would be no abatement in the injury plaintiffs claim to suffer from the general market‐distorting effects of the ZEC program. In short, plaintiffs’ injuries ‘would continue to exist even if the [legislation] were cured’ of the alleged discrimination,” the court said. “Because plaintiffs’ asserted injuries are not traceable to the alleged discrimination against out‐of‐state entities, but (rather) arise from their production of energy using fuels that New York disfavors, they lack Article III standing to challenge the ZEC program.”

Win for RECs?

“The decision is a win for both ongoing state efforts to preserve existing nuclear plants — New Jersey regulators expect to finalize a ZEC program by the end of the year — and long-standing renewable energy policies,” said Ari Peskoe, director of the Electricity Law Initiative at Harvard Law School. “The panel held that renewable energy credits (RECs), instruments that are used for compliance with renewable portfolio standards, are legally indistinguishable from ZECs. Today’s decision thus implicitly concludes that RECs are not preempted under the FPA, an issue which no court has ever squarely addressed.”

CAISO Seeks to Extend Aliso Canyon Rules

By Hudson Sangree

CAISO is seeking to extend measures for another year that deal with the continuing threat to electrical reliability posed by limited operations at the Aliso Canyon natural gas storage facility, where a massive release of methane occurred in October 2015.

CAISO is seeking expedited approval from FERC to renew the temporary tariff provisions, which were first put in place in June 2016 and then subsequently refined and extended. (See CAISO Board Aliso Canyon Rules Package.)

CAISO is seeking to extend for another year interim market measures designed to deal with gas supply restrictions at the damaged Aliso Canyon facility. | California Governor’s Office of Emergency Services

“Our hope is to be able to keep these measures in place for another 12 months,” Anna McKenna, an assistant general counsel for the ISO, said in a conference call with stakeholders Tuesday.

The provisions include a measure allowing the ISO to enforce constraints on the maximum amount of natural gas that can be burned by gas-fired plants in the areas served by the Southern California Gas and San Diego Gas & Electric. The constraints would be based on limited supply anticipated by CAISO during specific hours.

The provisions also allow CAISO to suspend or limit the ability of scheduling coordinators to submit virtual bids if it’s determined virtual bidding could undermine reliability or grid operations.

Similar provisions have been in place for the past two years to prevent blackouts or grid disruptions caused by the natural gas supply in Southern California being over-taxed.

The current proposal, called Phase 4, would extend the temporary provisions now in place for another year beyond Nov. 30 and Dec. 16, when they are set to expire.

CAISO planned to file its proposal with FERC by Thursday and ask for a 60-day turnaround so the new restrictions are in place when the first set of rules expires at the end of November.

Before the 2015 blowout, Aliso Canyon was the state’s largest natural gas reservoir, and its damaged status poses challenges to generators and regulators alike.

Despite objections from local residents and Los Angeles County officials, SoCalGas resumed injections into the facility in July 2017 to comply with a state directive to maintain sufficient gas inventories to support reliability on the region’s gas and electric systems. (See CPUC OKs Temporary Increase in Aliso Canyon Injections.)

Illinois: End PJM Capacity Market?

By Rory D. Sweeney

Illinois regulators last week suggested PJM consider ending its capacity market if it continues supporting policies that the state believes discount its generation preferences. [Editor’s Note: An earlier version of this story incorrectly stated that regulators had threatened to leave the RTO.]

The Illinois Commerce Commission convened a Sept. 20 hearing on PJM’s capacity market three weeks before a deadline to respond to a FERC order that rejected both of the RTO’s proposals for revising its capacity market, which sparked a rush to develop alternatives. (See FERC Orders PJM Capacity Market Revamp.)

Panelists speak at the Illinois Commerce Commission’s hearing on PJM’s capacity market last week. | © RTO Insider

While several proposals emerged, including one supported by the Illinois Citizens Utility Board, PJM has maintained support for its own plan, which would pair an expanded minimum offer price rule (MOPR) with a two-stage auction that removes subsidized resources and reprices the results.

Already well aware of Illinois’ grievances, PJM staff attending the hearing attempted to explain the RTO’s position.

“We are really trying to make this work,” PJM’s Darlene Phillips said. “We recognize that Illinois and other states have the right to make decisions. We are not trying to fight against those decisions. We are trying to make sure that, at the end of the day, our markets work for the entire region. There are other states that aren’t making those decisions … [and their generators] don’t have the luxury of getting an out-of-market payment.”

Another Way?

PJM’s assurances didn’t sway either the ICC commissioners or the other panelists, largely made up of either environmental advocates or representatives of Exelon, which has two nuclear facilities in Illinois benefiting from a 2016 state law that subsidizes the units with state-funded zero-emission credits. The 7th U.S. Circuit Court of Appeals recently upheld the state’s right to provide the funding.

“What if we throw this capacity market out?” ICC Commissioner John Rosales asked, noting that FERC had already ruled the market unjust. “There’s some rationale we can do it another way.”

PJM MOPR capacity market Illinois Commerce Commission
Panelists speak at the Illinois Commerce Commission’s hearing on PJM’s capacity market last week. | © RTO Insider

He pointed to ERCOT, which doesn’t have a capacity market.

“Is that an option? … Is there something else that we can do? Because the amount of money is uneconomical,” he said. “That’s a lot of money that’s invested in a reserve market that doesn’t seem to be needed most of the periods throughout the year,” Rosales continued. “Understand, there’s times that we’re going to need some help, but you get that [help] from others.”

Jen Tribulski, a PJM attorney, suggested that FERC didn’t intend to do away with PJM’s “capacity market as a whole,” but sought to improve how the market deals with out-of-market payments.

The disagreement came over what is considered a subsidy. Phillips said that “we have to draw a line somewhere. This is not easy.”

However, opponents argued PJM has larger market distortions to address.

“Regulated utilities have the ability to subsidize all of their generation with ratepayer funding, so if you’re going to talk about a market without subsidies, you’ve got to really relook at the whole market. It’s the single biggest market distortion that there is,” said Rob Kelter of the Environmental Law & Policy Center. “When you consider the cost of energy and you don’t consider the cost of environmental externalities, you are creating the biggest distortion you could possibly create. Coal and natural gas pollute.”

“Right now, the proposal on the table is to artificially raise the prices that consumers would be paying to preserve the supremacy of the capacity market,” said Andrew Barbeau of The Accelerate Group. “There’s a certain fealty to the capacity market that we’ve seen in recent years … to use the capacity market to start serving other purposes. It’s always been there to serve as this insurance product. Consumers are paying more and we’re getting less for it, and it’s kind of violating what residents of the state have been pretty consistently demanding, which is that the power be cheaper and cleaner.”

‘Fundamental Disconnect’

Phillips said the market “is doing what it was meant to do when it was put in place” to produce “reliability at the least cost,” but that it didn’t contemplate environmental concerns. She added that she was “not saying there’s not room for improvement.”

“That’s something that states can get together and have a discussion about” in creating a market-based proposal, she said. “You’re getting reliability. You’re getting assurances, not insurance, [but] assurances that three years from our market, three years forward, that we have enough capacity online to make sure the energy needs during that period are met.”

ICC Chairman Brien Sheahan said there is a “fundamental disconnect in PJM’s conception of what ‘accommodate’ is and what ‘mitigate’ is.”

PJM says its proposal accommodates states’ policy decisions, but states argue it instead mitigates their efforts to sponsor preferred technologies.

“You can’t just start doing this kind of line drawing,” he said. “And the end result, I predict, will be if they don’t accommodate, then the states are going to find alternatives. … Legislatures and governors in states that care about climate change and care about environmental policy are not going to bow to how [PJM thinks] they should work.”

ICC Manager Randy Rismiller suggested moving away from capacity markets altogether.

“Energy and ancillary services markets historically have worked quite well. They haven’t been as contentious as capacity markets. This sort of gradual gravitation away from capacity might be a way out of these constant conundrums,” he said.

CUB’s Kristin Munsch urged PJM to “stop trying to separate us, but integrate our preferences into the market.”

“I think PJM in recent years has begun to adjust the construct, a market that we thought was working well, to one that’s no longer reflecting what I think consumers are looking for,” she said.

CAISO Finalizes Draft TAC Proposal

By Hudson Sangree

CAISO moved closer this week to updating its transmission access charge (TAC) structure to include new rules about how to measure transmission usage.

Stakeholders discussed the final draft proposal Monday at CAISO headquarters in Folsom, Calif., with participants also joining by telephone.

The proposed rules are intended to more accurately allocate transmission costs based on current grid conditions to achieve greater efficiency and cost-effectiveness, the ISO contends.

Power lines in Contra Costa County, California | USDA

In particular, the rules would change the current volumetric TAC to a hybrid one that uses historic peak demand data instead of forecasted data.

“It’s kind of a balance we’re trying to strike here,” Chris Devon, CAISO market and infrastructure policy developer, told stakeholders.

The volumetric-only approach is no longer appropriate because of a changing grid, most notably the rise of distributed generation and other distributed energy resources, the ISO and many stakeholders contend. The hybrid approach would help adjust for this new reality so that transmission owners can better recover the costs of building, maintaining and operating transmission facilities, proponents said.

“The proposed hybrid approach is an improvement over the current TAC structure,” the ISO said in its presentation Monday. “[It] captures both volumetric and peak demand functions and reliability benefits provided by the system.”

Planning for the revisions started in April 2017 and has included several stakeholder meetings. The initial straw proposal went through two revisions, with some of the more controversial proposals modified or rejected.

CAISO recently backed off a proposed provision that would have moved the point of measurement for transmission usage away from the end-use customer’s meter to the interface between the transmission and distribution systems to better reflect increased customer reliance on resources directly connected to the distribution network, such as rooftop solar.

“The ISO is willing to revisit the point-of-measurement issue — for purposes of prospectively allocating the costs of future transmission facilities — if state policymakers and regulatory authorities, after careful consideration of the merits and implementation issues, support retail rate changes that provide a transmission cost credit (i.e., relief from retail rate charges for certain new transmission facilities) to load-serving entities that have procured distributed generation resources,” the ISO wrote in the proposal.

The TAC plan still has a way to go before it could be implemented.

A final proposal will likely be submitted to the ISO Board of Governors in the first half of 2019, with board approval coming later next year.

It would then have to be submitted to FERC, with implementation occurring no sooner than 2021 or 2022, according to CAISO planners.

The grid operator previously developed a proposal to allocate transmission costs over an expanded balancing area if the ISO integrates new members from other areas of the West. (See CAISO Floats Latest Cost Allocation Plan for Expanded Balancing Area.) That proposal has been shelved until CAISO expands into other regions.

New England Senators Urge FERC to End Press Ban

Six New England senators urged FERC Tuesday to end the New England Power Pool’s ban on public and press attendance at stakeholder meetings.

Sheldon Whitehouse | © RTO Insider

U.S. Sens. Sheldon Whitehouse (D-R.I.), Jack Reed (D-R.I.), Ed Markey (D-Mass.), Elizabeth Warren (D-Mass.) and Jeanne Shaheen (D-N.H.) joined Sen. Richard Blumenthal (D-Conn.) in a letter urging FERC to reject NEPOOL’s proposal to codify its longstanding closed door policy (ER18-2208).

NEPOOL FERC Order 719 press ban
Richard Blumenthal | Richard Blumenthal

“Residents of New England pay some of the highest electricity rates across the country,” the senators said. “Consumers deserve to be aware of the important decisions that are made that affect their household energy bills and the environment. Such decisions should be transparent and subject to public scrutiny.”

The senators dismissed NEPOOL’s argument that allowing press access would hurt the ability of NEPOOL members to talk candidly, calling it “a claim that is neither supported nor justified. In New England and around the country, it is essential that the deliberation process be kept open to all who are affected by these decisions.”

New England is the only one of the seven U.S. regions served by RTOs or ISOs where the press and public are prohibited from attending stakeholder meetings.

“Although NEPOOL does publicly release documents, including meeting minutes and official records, both in advance and after meetings take place, this cannot be considered a substitute for membership,” the senators said.

They warned that approval of NEPOOL’s proposal “could have significant impact on and set precedent for stakeholder participation in electricity market entities, and not only in New England. Formal exclusion of stakeholders from decision-making in NEPOOL would be in stark contrast to FERC Order 719, which sought to increase and not hinder responsiveness to stakeholders across all RTOs.”

FERC NEPOOL press ban order 719
FERC commissioners testifying before the Senate Energy and Natural Resources Committee in June. | © RTO Insider

On Sept. 18, a dozen members of the House of Representatives also called on the commission to open the meetings.

Their letter was signed by Rep. Frank Pallone (D-N.J.), the ranking member of the House Energy and Commerce Committee; Rep. Fred Upton (R-Mich.), the chairman of the committee’s Subcommittee on Energy; Rep. Bobby Rush (D-Ill.), the ranking member on the subcommittee; seven of nine members from Massachusetts’ delegation; and one representative each from Rhode Island and Vermont.

Last week, NEPOOL filed a motion to dismiss RTO Insider’s protest seeking to open the meetings, saying FERC lacks jurisdiction to force changes (EL18-196). Other intervenors supported RTO Insider’s request that FERC either force a NEPOOL rule change or strip it of its role as ISO-NE’s stakeholder body. (See NEPOOL: FERC Can’t Change Press, Public Ban.)

— Rich Heidorn Jr.

ERCOT: Market Performed ‘as Expected’ During Summer Heat

By Tom Kleckner

ERCOT said an “exceptional” response by generators and a lack of extreme temperatures helped it meet record demand this summer without issuing alerts or calling for conservation measures.

ERCOT’s summer performance review said the wholesale market “performed as expected,” with generators responding to higher price signals and making their units available during peak demand periods. It noted the market “is designed to provide financial incentives to encourage market participants to respond appropriately” under tight operating conditions.

The ISO, which manages 90% of the state’s grid, set a new system demand peak of 73.3 GW on July 19, more than 2 GW higher than the previous record set in August 2016. The record high was one of 14 set during the lone period of extreme heat this summer (July 18-23).

Hourly Average Demand, Capacity, and Reserves on 7/19/2018 | Ercot

ERCOT also set a new weekend peak demand of 71.4 GW on July 22.

The summer — which ends Sept. 30 for ERCOT — was the fifth hottest on record across Texas. However, high temperatures were “not as significant or as sustained” as they were during the 2011 record-setter, the ISO said. Temperatures averaged 86.7 degrees F during the summer, with Austin recording 90 days over 100 and Dallas 71 (including 40 consecutive).

Summer Peak Demands Records | Ercot

Real-time system-wide wholesale prices ranged from $33/MWh to $47/MWh between June and August, with a high of $3,125/MWh on June 5. The highest system-wide price for a single settlement interval during July’s extreme weather came on July 18, when prices hit $2,169/MWh.

The highest system-wide day-ahead price was $2,062/MWh on July 23.

The ISO had fewer reliability unit commitments in 2018 compared to last year because market participants made their units available during tight system conditions, according to the review.

Generation outages were also half of what was projected in ERCOT’s final seasonal assessment in April, the grid operator said. (See ERCOT Gains Additional Capacity to Meet Summer Demand.) Outages and de-rates totaled a little over 2 GW during the July 19 peak.

ERCOT entered the summer with a planning reserve margin of 11%, almost half of that in previous years. The tightest operating conditions came on Aug. 18, when two large generators tripped, one just before the day’s peak. The ISO relied on operating reserves to meet demand “with no reliability concerns.”

ERCOT filed the report and accompanying data on Monday afternoon with the Texas Public Utility Commission, which has opened a docket on the summer’s market performance (Project 48511).

The ISO’s staff will also share their findings with stakeholders during the Technical Advisory Committee on Wednesday and the Board of Directors on Oct. 9.

AEP Announces Closure of Oklaunion Coal Plant

By Tom Kleckner

Cheap energy from natural gas plants and renewables claimed another coal victim in Texas last week when American Electric Power announced it will close the Oklaunion Power Station near the Oklahoma border.

AEP, the plant’s operator and majority owner, said it plans to shut down Oklaunion by October 2020, citing concerns that the plant’s production costs are no longer competitive in ERCOT, company spokesman Stan Whiteford said.

ercot aep texas solar project tradewind energy william scherman
Oklaunion Power Station | AEP

The 32-year-old, 650-MW plant is split among four owners in both the ERCOT and SPP grids. AEP Texas owns a 54.69% interest in the plant. The other owners are the Brownsville Public Utilities Board (17.97%) in South Texas, AEP’s Public Service Company of Oklahoma subsidiary (15.62%) and the Oklahoma Municipal Power Authority (11.72%).

The plant accounts for 4.4% of ERCOT’s summer coal capacity. Its retirement will leave the grid operator with 24 operational coal units.

Two of those units, at CPS Energy’s J.T. Deely Power Plant, are currently mothballed and not included in ERCOT’s capacity calculations. The units date back to the late 1970s and have a combined capacity of 871 MW.

ercot aep texas solar project tradewind energy william scherman
CPS Energy’s J.T. Deely | CPS Energy

The San Antonio municipality notified ERCOT in 2013 it was closing Deely permanently by the end of 2018, partly to avoid spending as much as $550 million in environmental retrofits. CPS has said it remains committed to closing the plant, despite the Trump administration’s proposal the roll back the Clean Power Plan.

ERCOT spokeswoman Leslie Sopko said the grid operator has yet to receive an official notification of suspension of operations (NSO) regarding Oklaunion, and has not received an NSO for Deely’s permanent closure.

“AEP has advised us of their plans to close the plant,” Sopko said, noting the retirement will be reflected in ERCOT’s Capacity, Demand and Reserves report when it receives the NSO.

ERCOT lost 4 GW of coal-fired capacity last year when Vistra Energy closed three coal plants. (See Vistra Energy to Close 2 More Coal Plants.)

The grid operator still has more than 81 GW of capacity, though its reserve margin slipped to below 11% this year, following last year’s retirements. ERCOT survived record heat during July without any generation shortfalls or resorting to emergency measures.