Release History

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Release types

Releases are labeled with names of the form major.minor.point[-status]. There are two kinds of releases, full releases and "snapshot" releases. A full release such as 0.2.0 is distinguished by a missing status indicator. A snapshot release such as 0.2.0-SNAPSHOT is distinguished by the status label.

Full releases are stable; they will not be changed at all once announced. Instead, point releases may be made if required. Each full release includes a small downloadable distribution package for the server, sources for the sample broker, and detailed release notes. The actual server modules will be available through Maven Central, and will be automatically downloaded by maven when you first run the server.

Snapshot releases represent reasonably stable points along a development path, and will made when new features become available that are of interest to agent developers. They may or may not include downloadable distribution packages or release notes, but their status can be roughly assessed by looking at the current list of open issues on github. The latest deployed snapshot is always available in the server-distribution repo. Instructions for using particular snapshot releases will be sent out through the developer's mailing list; here's an example. Instructions for setting up a full server development environment are provided on the Power TAC developer's wiki at github.

Release history

The most recent release is shown first. For the more recent releases, the download links are given at the top of the release notes. Older versions are available ....

Power TAC simulation server, game visualizer, and sample broker, version 1.5.0, April 2018

This is the first release for the 2018 tournament season. Further releases, if any, in the 1.5 series will be bugfixes only.


Release notes 1.5.0

  • Balancing orders are no longer supported for tariffs with regulation rates (Issue #946). Instead, balancing orders for these tariffs are automatically generated from the regulation rates. This takes advantage of the incentive-compatibility of the VGC mechanism, while avoiding a market failure in which a broker could exploit customers by offering a tariff having a very high payment for up-regulation and a slightly less high charge for down-regulation, and then submitting a balancing order that only offered down-regulation, or that offered up-regulation at a price that reliably would never clear the market.
  • Some of the factored-customer models now support the THERMAL_STORAGE power type and offer regulation capacity, adding significantly to the available demand response capacity in the customer population (Issue #863).
  • We made several changes to the way STORAGE customers evaluate tariffs and report regulation capacity (Issue #944). One result is that EV Customers now subscribe to reasonable ELECTRIC_VEHICLE tariffs.
  • Updated the activation of the capacity-control service in the simulation so that economic controls (broker-initiated curtailment) work as advertised.(Issue #958).
  • Visualizer now supports multiple game replay sessions without being re-started (Issue #945).
  • Visualizer game replay can now be throttled to enable interaction with the visualizer while the replay proceeds (Issue #964).
  • It is now possible to extract the complete high-level configuration from a running server (Issue #949).
  • Fixed the initialization of regulation rates in the sample broker (Issue #957).
  • A new "broker adapter" module is now available to allow out-of-process broker implementations (Issue #859). This is intended to allow use of non-Java programming environments for broker implementation. Versions are available that communicate through the local filesystem and through a generalized RPC mechanism that allows for cross-platform implementations. Download links provided above.

Power TAC simulation server and game visualizer, version 1.4.4, June 2017

This is a minor bugfix update of 1.4.3, which fixes a bug encountered at the beginning of the 2017 tournament. Note that this release does not update powertac-core or the sample-broker.


Release notes 1.4.4

  • In the balancing market, fixed the sign on the p1 value for cases of brokers with positive imbalance in a down-regulation environment(Issue #941).

Power TAC simulation server, game visualizer, and sample broker, version 1.4.3, May 2017

This is a minor bugfix update of 1.4.2. It will be used for the 2017 tournament.


Release notes 1.4.3

  • Sample broker now correctly processes the --repeat-hours command-line option (Issue #935).
  • One of the customer models was incorrectly evaluating tariffs with high early-withdrawal fees (Issue #931). This was an exploitable bug with the potential to affect tournament outcomes.
  • The evaluation order for peak-demand assessment has been corrected to consider only the highest peaks among the qualifying instances of peak demand (Issue #936). As a result, the per-MW fee for capacity peaks has been substantially reduced.
  • Validation of incoming Orders has been enhanced to better deal with non-numeric price values from brokers (Issue #937).
  • Validation of tariff Rates was improved to prevent out-of-bounds daily/weekly start-finish times from raising exceptions in the server (Issue #939). These values are needed to specify time-of-use tariffs.
  • Some of the Large Customer models were incorrectly identified as Small Customers in the CustomerInfo structure passed to brokers at the start of a game (Issue #938). These are now correctly identified.
  • A couple of minor configuration issues in the server were corrected (Issue #933 and Issue #932).

Power TAC simulation server, game visualizer, and sample broker, version 1.4.2, May 2017

This is a bugfix update of 1.4.1. It was intended to be the version used for the 2017 tournament.


Release notes 1.4.2

  • Sample broker now runs correctly from a jar file (Issue #920).
  • New visualizer now accepts broker names with embedded dash (Issue #916).
  • Parameterized and updated the shape of the supply curve in the wholesale market to more accurately reflect the impact of congestion at high demand levels (Issue #929).
  • Updated logtool-core to correctly run multiple sessions (Issue #930). This was never needed when running logfile analyzers, but is important now that the new visualizer uses logtool-core to replay games from logs.
  • Fixed a problem with the Weather Service that was occasionally causing an ArrayIndexOutOfBounds exception (Issue #922).
  • Fixed NPE in old visualizer that happened when inspecting tariff market display (Issue #923).
  • Simplified the writing of logfile analyzers by adding reflection-based connection between incoming messages and message handlers (Issue #928).
  • Changed the bundling of logfiles in the tournament manager to include boot record and boot logs (Issue #886).

Power TAC simulation server, game visualizer, and sample broker, version 1.4.1, March 2017

This is the version on which we expect to run the 2017 tournament.


Release notes 1.4.1

New features:

  • The wholesale market now models a larger population of buyers beyond the set of Brokers serving the Power TAC scenario Issue #878. This means that the restriction on market position implemented to prevent "cornering the market" in the 2016 competition is lifted. Overall demand is increased by a factor of 11 (the "MISO buyer" purchases roughly 10 times the energy needed by the Power TAC scenario). However, the demand from the MISO buyer is generated from a time series that models the actual demand of the North Central region of the North American Midwest Independent System Operator. This population has a different consumption/production mix from the Power TAC scenario (much lower penetration of solar production, for example). On the other hand, the current temperature as reported by the Power TAC weather service affects the MISO demand, increasing strongly for uncomfortably high temperatures and less strongly for uncomfortably low temperatures.
  • The new visualizer, first introduced in the 2016 competition, replaces the original Power TAC visualizer, which is no longer supported. The new visualizer has the ability to re-play games from a state log, or from a logfile tarball in the format produced by the tournament scheduler. The source of the logfile tarball can either be a URL or a local file specified as a file:// URL. To better support this functionality, several improvements have been made in the logfile reader (in the logtool-core module), which is now integrated into the Power TAC simulation server.

Known problems:

  • Regulation and curtailment are not perfectly synchronized with tariff subscription changes, and so sometimes a customer gets the wrong value for regulation in the timeslot after a subscription change (Issue #733).
  • It is currently very difficult to get the Power TAC simulation server or broker to operate correctly through proxy servers (Issue #842).
  • Brokers are not notified if the wholesale market rejects their orders (Issue #873) although the causes of rejected orders are fairly obvious, such as quantity below theshold.

Summary of resolved issues:

  • The names of logfiles generated by tournament games now match the names of the games in the tournament scheduler's table display (Issue #879).
  • Customers now treat tariffs with positive signup bonuses with some suspicion, by re-evauating available tariffs once they have received the bonus (Issue #877).
  • Fixed a problem that occasionally prevented brokers from logging in to tournament games (Issue #880).
  • Fixed a problem in which a broker that withdrew from all its tariffs and therefore had no consumption still had to pay peak-capacity fees (Issue #882).
  • Fixed accounting for Balancing Control Events in the case where a broker had no imbalance (Issue #889).
  • Drastically simplified the build process by re-modularizing the various bits and pieces into a powertac-core super-module that builds in one step and contains the powertac-parent pom as well as common, and a powertac-server module that is now a clean super-module that can be built in one step (Issue #903).
  • Cleaned up configuration across modules, removing all non-default configuration from server-main (which forced a re-build to incorporate changes) and mostly moving it to server-distribution, where it is distributed in source form (Issue #911).
  • The sample broker now distinguishes between normal and regulation tariff transactions, and incorporates regulation transactions accurately into its records of customer production/consumption. The resulting broker performs significantly better than the original sample-broker due to better tracking of customer behavior (Issue #898).

Power TAC simulation server, game visualizer, and sample broker, version 1.3.3, July 2016

This is the version that ran the final round of the 2016 competition.


Release notes 1.3.3

Known problems:

  • The new visualizer that was used in the 2016 tournament does not yet work in research mode.
  • Brokers are incorrectly assessed capacity charges in the (rare) case where a broker pays capacity charges and then cancels all tariffs before the start of a subsequent capacity assessment interval (Issue #882).
  • The problem of cornering the wholesale market (Issue #870) is caused by a game-design flaw (Issue #878). A better fix would be to make the wholesale market effectively model a large number of distribution grids, each with demand profiles somewhat similar to the Power TAC customer models. This would reduce the market power of individual brokers in the wholesale market, and eliminate the need for an artificial limit on market share.
  • The published server configuration is sent to brokers at the start of a simulation session, but is not recorded in the server log (Issue #888). This makes it difficult to write a log analyzer without hard-coding server parameters.

Summary of resolved issues:

  • Broker id prefix values are now correctly assigned in tournament mode (Issue #880). Tournament games prior to this fix could be difficult to analyze because of id value collisions.
  • Customers are now much more likely to re-evaluate tariffs with high signup bonus values and short durations as soon as they expire (Issue #877).
  • Resolved a problem of duplicate usage profiles in the boot record for some storage types (Issue #869).
  • The potential for cornering the wholesale market and profiting from it have been greatly reduced by limiting wholesale market share, and by limiting the seller's margin (Issue #870).
  • The DistributionReport message now includes the timeslot index value (Issue #868).

Power TAC simulation server, game visualizer, and sample broker, version 1.3.2, May 2016

This is a minor update of release 1.3.2 that adds data elements to two message types. This was requested by broker developers, and makes the message format a bit more consistent. Because the changes are in the common module, all server modules are updated, and brokers can take advantage of the changes by compiling with broker-core 1.3.2.


Release notes 1.3.2

  • TariffTransaction now provides the isRegulation() method (Issue #867).
  • DistributionReport now provides the getTimeslot() method that returns the timeslot index (Issue #868).

Power TAC simulation server, game visualizer, and sample broker, version 1.3.1, April 2016

This is the version prepared for the 2016 Power TAC tournament starting in June 2016. It includes a new customer type representing simple batteries, updates to match the 2016 game specification, and a number of other improvements.


Release notes 1.3.1

New features:

  • All components are now built with (and require) Spring version 4.1 and Java 8. The Spring dependencies are satisfied at runtime, but the updated Java environment must be installed on development and execution platforms for both the server and broker.
  • The sample broker has been refactored into a core module, available through maven central, and a set of services that implement basic broker behavior (Issue #828). The hope is that this will simplify the job of broker developers by making clear which code elements might need to be changed to implement new broker behaviors.
  • Balancing costs are much higher in the past, since there were may cases in the 2015 tournament in which brokers were better off letting the balancing market supply a portion of their customer load (Issue #837).
  • Distribution costs are now based on two factors, as laid out in the 2016 specification: number of customer connections, and peak demand. This is a much better match to what happens in the real world, and is intended to motivate brokers to manage peak demand (Issue #840).
  • Game logs now contain the maven artifact ID, and the ID is also communicated to brokers in the updated Competition object (Issue #834). This is intended to allow compatibility testing by brokers, and version-variable behavior when needed for log analysis.
  • There is now a "battery" customer type that simply offers regulation capacity (Issue #854). Up-regulation capacity is available if the battery is not completely discharged, and down-regulation capacity is available if the battery is not completely charged.
  • The sample broker now includes an example of handling the BalanceReport message (Issue #857).
  • The factored-customer models can now be configured at the top-level, for example by a config file supplied at runtime (Issue #790). This allows, for example, changes in the population of BrooksideHomes without re-building the factored-customer module.

Known problems:

  • The electric-forklift fleet model does not do regulation when subscribed to variable-price or TOU tariffs (Issue #853). This is largely because this model uses linear programming to plan its consumption, and we have not worked out how the potential for regulation activity should be evaluated.
  • None of the factored-customer models report regulation capacity, and so cannot participate in balancing activities except through curtailment (Issue #863).
  • Although brokers are charged for peak demand, there is currently no way to charge customers for demand peaks (Issue #841). This is common practice for commercial tariffs in the real world, but it will require substantial updates to customer models.
  • There are a number of problems with the existing visualizer. A replacement visualizer module should be ready ahead of the 2016 tournament, but it should be compatible with this version of the server, and so it can be released separately.

Summary of resolved issues:

  • Re-running games with fixed weather data and random-number seeds now produces the expected results (Issue #667).
  • In sample-broker, the BrokerContext now correctly maintains its cash balance (Issue #821).
  • Javadoc generation now works as expected (Issue #784).
  • The per-timeslot DistributionReport is now logged to the state log correctly (Issue #843).
  • BalancingControlEvent messages now contain the correct prices (Issue #835).
  • The BalanceReport message is now logged to the state log with the correct values (Issue #861).
  • RegulationCapacity instances are now logged correctly and can be used to discover actual per-timeslot regulation capacity (Issue #819).
  • Per-session re-initialization in the server now works as expected (Issue #851).
  • Customer tariff evaluation now includes expected benefits from regulation activities for tariffs with RegulationRate instances (Issue #855).
  • It is now possible to tell the difference between TariffTransactions originating with consumption/production and those resulting from exercising regulation capacity (Issue #862).
  • Tariff subscription expiration accounting is now done on a per-timeslot basis rather than a per-day basis (Issue #831). This was causing customers to incorrectly believe that they could not unsubscribe without penalty in some cases.

Power TAC simulation server and game visualizer, version 1.2.3, May 2015

This is an update to 1.2.2 with a fix for Issue #830. In this version, not only will customers ignore early-withdrawal payments when the minimum-duration is less than the customer's tariff-evaluation cycle, but customers are also aggressive about exploiting positive early-withdrawal payment opportunities. In other words, the possibility of a payment for early withdrawal from a tariff overrides the customer's normal inertia.


  • Simulation server version 1.2.3: zip, tar.gz.

Power TAC simulation server and game visualizer, version 1.2.2, April 2015

This is the version that finished the April 2015 final round, after a defective broker discovered a way to crash the 1.2.1 server. This version is network-compatible with the 1.2.0 Sample Broker, although in that case the broker will not have the newer validation code for Rates.


  • Simulation server version 1.2.2: zip, tar.gz.

Known defects in this version (and earlier versions):

  • There is a possible exploit in customer tariff evaluation that will allow a tariff with a positive early-withdrawal payment to be given credit even though the minDuration value is too short for the customer to ever collect the payment (Issue #830).

Power TAC simulation server and game visualizer, version 1.2.1, April 2015

This is the version that started the April 2015 Final round.


Server release notes

The biggest changes are the addition of the Electric Vehicle and Electric Forklift-Truck customer models. Both are storage devices. The Electric Vehicle model is a bottom-up model of a number of personal electric vehicles (Teslas, Nissan Leafs, etc.) whose driving habits are drawn from Netherlands driving behavior data. They exhibit the full range of storage capabilities, including dumping energy back into the grid. The forklift model is several fleets of electric forklifts using large lead-acid batteries, operating on a shift schedule. They do not have vehicle-to-grid capacity (because their batteries have limited numbers of charge-discharge cycles), but they are quite flexible in the timing of their energy usage and offer a fair amount of storage capacity.

In addition to the new models, some stability improvements, new test cases, and documentation improvement, there are a number of visible updates in this version. Several relate to tariff evaluation, including:

  • Evaluation of tiered rates was incorrect, should now be correct (Issue #777).
  • The handling of negative tariff signup payments (where the customer pays the broker for the privilege of subscribing) had to be disabled in the 2014 competition because it was being used to abuse customers (Issue #766). In this release, the customer amortizes signup fees over a much shorter period, and revocation of a tariff with a negative signup fee results in full refunds to customers.
  • Fixed a flaw in evaluation of incomplete customer profiles (Issue #792).
  • Withdrawal fees are no longer assessed for revoked tariffs (Issue #762).
  • All customer models that have flexibility in their energy usage patterns now create custom usage profiles for evaluating time-of-use tariffs (Issue #795).
  • Fixed a flaw in evaluation of signup bonuses, which were given too much weight for some customers (Issue #825).

Several customer models have been updated and cleaned up, including:

  • The basic interaction between customer models and the simulation has been refactored and unified, making the construction of new customer models much easier (Issue #781).
  • The officecomplex-customer model was getting signing up for multiple tariffs, and messing up the customer-count in the visualizer (Issue #807).
  • The factored-customer model has been re-worked in several areas, especially with respect to time management (Issue #782), and a new SolarLeasing customer has been created within the factored-customer framework.

Other interesting changes since the 1.1.1 release include:

  • The total imbalance per timeslot is now available through a new BalanceReport message broadcast to brokers in each timeslot (Issue #755).
  • Balancing actions using down-regulation are now handled correctly (Issue #817).

Power TAC simulation server and game visualizer, version 1.1.1, August 2014

This is a point release for the 2014 competition version of the server that fixes issue #780 that was causing strange behavior when one of the released agents submitted time-of-use tariffs that did not cover all the hours of the day. The intention was to reject such tariff offerings, but in the case of incomplete coverage the tariff would be rejected and partially erased, but then accepted and published anyway.

Brokers from the 2014 competition, and brokers compiled with version 1.1.0-SNAPSHOT or 1.1.0 of the sample broker code should be compatible with this release.


Power TAC simulation server, sample broker, and game visualizer, version 1.1.0, August 2014

This is the version used in the May and June 2014 competitions, with a few minor fixes.


Server release notes

In addition to a number of stability improvements, there were also quite a few visible changes since the previous release, including:

  • Weather forecasts are more accurate (issue #645) and contain prediction 1-24 hours into the future, rather than 0-23 (issue #682).
  • Loading weather data from a file (rather than from the weather server) now works more reliably (issue #730).
  • Weather reports from the bootstrap period are now stored in the WeatherRepo (issue #745).
  • Tariff revocation messages are now sent to all brokers (issue #719) rather than just to the broker that issued the revoked tariff.
  • The server now supports thermal and battery storage devices, with a new PowerType and the ability to specifically pay for balancing events rather than just offering a general discount (issues #724, #653). This feature makes use of the new RegulationRate type (issue #740). The balancing market now handles curtailment of both production and consumption (issue #671).
  • CustomerInfo now specifies the maximum available controllable capacity (issue #697).
  • The BalancingMarket is now a separate module, making it easier to experiment with different implementations (issue #578).
  • Brokers can no longer supersede each others' tariffs (issue #731).
  • The household and officecomplex customer models do a better job of evaluating tariffs (issue #735). Other problems with tariff evaluation have been fixed (issues #763, #768).
  • Additional validation checking on Orders (issues #738, #739).
  • The wholesale market now requires a minimum order quantity (issue #742).
  • A rare problem with wholesale market clearing has been fixed (issue #767).
  • The default genco model now produces prices that mimic the price curve at a load node subject to congestion pricing (issue #737). The core pricing model is a configurable polynomial function, in which the constant and quadratic coefficients vary through a configurable random walk.
  • Slippage of the sim clock now causes a sim to abort (issue #729). This is the only approach we have been able to find that handles the problem of the sim not getting control (because of processor contention) for more than one tick.
  • Customers are no longer charged withdrawal fees for revoked tariffs (issue #762).
  • Corrections in Visualizer display (issue #744).

Sample Broker release notes

  • The sample broker now includes examples of annotation-based configuration -- see for example MarketManagerService (issue #717). This works in all packages (issue #723), but only classes in org.powertac can be specified without the full package path.
  • Javadoc documentation has been improved significantly (issue #720) and is now being automatically generated when changes are pushed to the master branch (issue #713).
  • TariffRepo now works correctly in brokers, where it can be used to track competing tariffs (issue #722).
  • The tariff supersede example in PortfolioManager now works correctly (issue #736).
  • Tariff id values are now constrained to conform to the prefix sent by the server (issue #734).
  • Methods that handle incoming messages are now synchronized to allow for correct operation of multi-threaded broker designs.
  • Packaged brokers (distributed as executable jar files) can now read their default configuration files correctly (issue #778).

Known issues

There are a few unresolved issues at the time of release, including:

  • There is a possibility of discontinuity in the interaction of balancing orders and tariff subscription changes (issue #733).
  • Re-running games with stored random seeds does not behave exactly as expected (issue #667).
  • Customer tariff evaluation does not handle tariffs with negative signup payments as well as it should (issue #766). There are a few other potential problems remaining with tariff evaluation (issues #771, #777).
  • Total imbalance per timeslot should be public information. There is currently no way to communicate this to brokers (issue #775).

Power TAC simulation server and game visualizer, version 1.0.1, July 2013

This is the version of the server actually used in the July 2013 competition. It differs slightly from version 1.0.0 in two ways:

  • Weather data is fetched asynchronously, reducing the probability of pauses every 24 hours due to delays fetching this data.
  • There are some small improvements to the Visualizer.

This version is compatible with version 1.0.0 of the sample broker, so there is no corresponding release of the sample broker.

Download the binary package in tar.gz or zip format.

Power TAC server, sample broker framework, and game visualizer, version 1.0.0, June 2013


This is the version intended for the July 2013 annual competition. The server and broker are far more stable, and a number of issues related to their interactions in multiple-game tournament environments have been resolved.

Server release notes

  • The Visualizer has been completely re-designed, and mostly re-written. The presentation is much more consistent, and the mouse-over behavior is more informative. Visualizer displays can be exported to multiple graphical formats, including svg, which can be used in publications.
  • Customer tariff evaluation has been completely re-designed, documented, and re-written (Issues #673, #633, #689).
  • Representation of time in domain types and in JMS messages is simplified. In most cases, timeslot index is used rather than timeslot reference or milliseconds (Issue #640).
  • Context-switch delays from the underlying platform no longer affect the timeslot sequence. Instead, they are detected, the sim clock is adjusted, and the adjustment is sent to brokers (Issues #519, #706).
  • Incorrect bootstrap file path no longer crashes the server (Issue #535).
  • Games can be re-run with repeated random-seed values and repeated weather data (Issue #648).
  • Anomalous buy orders no longer generate cleared trades with negative prices (Issue #644).
  • Weather data in bootstrap files now contains timeslot information (Issue #660).
  • Quantities in distribution transactions are now computed correctly. Brokers can no longer get paid for using the service (Issues #669, #691).
  • CashPosition is now an immutable type, and it gets logged to the state log, so broker balances are now much easier to track (Issues #541, #666).
  • Rate structure is cleaned up, much better documented, Rate validation has been rewritten, and a number of test added to validate various tariff variations (Issues #665, #692, #704).
  • Bootstrap sessions no longer start the JMS process (Issue #599).
  • Multiple improvements in the state log format (Issue #564).
  • Balancing now includes transactions from the current timeslot (Issue #681).
  • Market transactions are now posted when power is delivered, rather than when it is ordered. This can make a big difference at end-of-game (Issue #474).
  • Customer models are now subscribing to reasonable production tariffs (Issue #677).
  • Chained constructors no longer generate multiple state log entries (Issue #684).
  • Brokers are now notified when wholesale market orders are rejected (Issue #296).
  • Variable-rate tariffs now work as advertised (Issues #690, #686).
  • Weather forecasts are finally working correctly (Issue #699).
  • Tariffs of failed broker are now automatically revoked (Issue #702).

Sample Broker release notes

  • A maven goal and associated documentation have been added to assist broker developers with creating standalone binary distribution packages for their brokers (Issue #652).
  • Brokers can be run on platforms without ntp, using a new command-line option and an approximate synchronization based on timing the initial login handshake (Issue #693).
  • MarketManager now recycles correctly between sessions in a multiple-session run (Issue #705).

Known issues

  • There is a memory leak in the Visualizer (Issue #710). This is usually not a problem in a single game, but can bring down the server after a few sessions without a restart.
  • There remains some unhelpful variability when running games using pre-recorded random seeds (Issue #667).
  • The supersedes list in a TariffSpecification is not getting into the state log (Issue #685).

Older releases

Release history for the 2011 Grails prototype

Instructions for the original Grails version of the Power TAC simulation server.