Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

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  • Update H2 SMR efficiency
    Open
    FINITO

    Difficulty 2/5 1-3 hours Newbie friendliness 62/100

    ReEDS-Model/ReEDS#250 ·

    Maintainers usually reply within 3 days

  • Stochastic optimization
    Open
    project

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    ReEDS-Model/ReEDS#238 · 1 reaction ·

    Maintainers usually reply within 3 days

  • Interconnection queues: Remove time profile
    Open
    discuss

    Difficulty 5/5 Over a week Newbie friendliness 35/100

    ReEDS-Model/ReEDS#234 ·

    Maintainers usually reply within 3 days

  • Combine GSw_StartMarkets and this_year into a single switch
    Open

    Difficulty 5/5 Over a week Newbie friendliness 28/100

    ReEDS-Model/ReEDS#225 ·

    Maintainers usually reply within 3 days

  • Add dollar year to output plots
    Open

    Difficulty 5/5 Over a week Newbie friendliness 35/100

    ReEDS-Model/ReEDS#224 · 1 comment ·

    Maintainers usually reply within 3 days

  • Separate historical and projected technology costs
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 48/100

    ReEDS-Model/ReEDS#215 · 1 comment ·

    Maintainers usually reply within 3 days

  • Add some more standard output plots
    May be free again @patrickbrown4 claimed this 38 days ago, and no pull request is open. Open

    ReEDS-Model/ReEDS#212 · 1 assignee ·

    Maintainers usually reply within 3 days

  • Include endogenously sited flexible demand in RA assessment
    Open

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    ReEDS-Model/ReEDS#198 ·

    Maintainers usually reply within 3 days

  • Make new versions of z54 and z70 zonesets aligned with z90 instead of z134
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 45/100

    ReEDS-Model/ReEDS#195 · 2 comments ·

    Maintainers usually reply within 3 days

  • Correct CF improvement treatment for existing (initv) capacity
    May be free again @Yunzhi-Chen claimed this 52 days ago, and no pull request is open. Open
    bug

    ReEDS-Model/ReEDS#188 · 1 assignee ·

    Maintainers usually reply within 3 days

  • Collapse operation variables for zero-marginal-cost resources into one vintage
    Open
    speculative

    Difficulty 5/5 Over a week Newbie friendliness 35/100

    ReEDS-Model/ReEDS#186 ·

    Maintainers usually reply within 3 days

  • Separate resource class from technology set `i`
    May be free again @wesleyjcole claimed this 45 days ago, and no pull request is open. Open
    speculative

    ReEDS-Model/ReEDS#185 · 5 comments · 1 assignee ·

    Maintainers usually reply within 3 days

  • Use temperature-based gas prices by default
    Open

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    ReEDS-Model/ReEDS#178 ·

    Maintainers usually reply within 3 days

  • Variable hourly resolution
    May be free again @aschleif claimed this 67 days ago, and no pull request is open. Open
    enhancement

    ReEDS-Model/ReEDS#168 · 1 comment · 2 assignees ·

    Maintainers usually reply within 3 days

  • Update to 2026 reV supply curves
    May be free again @bsergi claimed this 78 days ago, and no pull request is open. Open
    data_changes hourlize

    ReEDS-Model/ReEDS#159 · 1 assignee ·

    Maintainers usually reply within 3 days

  • follow up PR: update doc to reflect all the change in PR#12
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    ReEDS-Model/ReEDS#158 ·

    Maintainers usually reply within 3 days

  • Fill out `inputs/*/README.md` documentation
    Open
    documentation TODO

    Difficulty 4/5 3-5 days Newbie friendliness 55/100

    ReEDS-Model/ReEDS#156 ·

    Maintainers usually reply within 3 days

  • Try applying stress-period PRM via operating reserves instead of load
    Open
    speculative

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    ReEDS-Model/ReEDS#154 ·

    Maintainers usually reply within 3 days

  • Move input and output processing from GAMS to Python
    Open

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    ReEDS-Model/ReEDS#143 ·

    Maintainers usually reply within 3 days

  • Change hydropower inputs to be capacity-weighted
    Open
    data_changes enhancement maintenance nice-to-have

    Difficulty 5/5 Over a week Newbie friendliness 22/100

    ReEDS-Model/ReEDS#140 ·

    Maintainers usually reply within 3 days

  • [Bug] Climate Adjustment Factors to Hydropower not Reflected in PRAS data
    Open
    bug

    Difficulty 3/5 1-2 days Newbie friendliness 45/100

    ReEDS-Model/ReEDS#131 ·

    Maintainers usually reply within 3 days

  • Include hourly availability of all generator types in net load in `capacity_credit.py`
    Open
    TODO

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    ReEDS-Model/ReEDS#118 ·

    Maintainers usually reply within 3 days

  • [Bug] Stress period climate adjustment factors are not ingested/applied to data
    Open
    bug TODO

    Difficulty 4/5 3-5 days Newbie friendliness 30/100

    ReEDS-Model/ReEDS#116 ·

    Maintainers usually reply within 3 days

  • Update to 2025 interconnection queue data
    May be free again @Yunzhi-Chen claimed this 66 days ago, and no pull request is open. Open
    data_changes

    ReEDS-Model/ReEDS#101 · 1 assignee ·

    Maintainers usually reply within 3 days

  • Speed up input processing scripts
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    ReEDS-Model/ReEDS#98 · 1 comment ·

    Maintainers usually reply within 3 days

  • Allow users to specify number of tech classes
    Open
    enhancement

    Difficulty 5/5 Over a week Newbie friendliness 18/100

    ReEDS-Model/ReEDS#59 ·

    Maintainers usually reply within 3 days

  • Establish uniform cutoffs for tech classes across scenarios
    Open
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    ReEDS-Model/ReEDS#58 ·

    Maintainers usually reply within 3 days

  • Update documentation to describe inclusion of `degradation_adj(i,t)` in `cost_cap_fin_mult(i,r,t)` calculation
    Open
    documentation maintenance

    Difficulty 3/5 Half a day Newbie friendliness 45/100

    ReEDS-Model/ReEDS#53 ·

    Maintainers usually reply within 3 days

  • Turning off state RPS/CES policies doesn't turn off state-level forced fossil retirements
    Open
    bug maintenance TODO

    Difficulty 4/5 3-5 days Newbie friendliness 30/100

    ReEDS-Model/ReEDS#49 ·

    Maintainers usually reply within 3 days

  • Update RGGI representation
    Open
    maintenance TODO

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    ReEDS-Model/ReEDS#48 ·

    Maintainers usually reply within 3 days

  • `cases.csv`: Standardize the formatting of the "Choices" column
    Open

    Difficulty 5/5 Over a week Newbie friendliness 15/100

    ReEDS-Model/ReEDS#45 ·

    Maintainers usually reply within 3 days

  • Docs: Describe all user-facing scripts and functions in one place
    Open
    documentation

    Difficulty 4/5 3-5 days Newbie friendliness 32/100

    ReEDS-Model/ReEDS#42 ·

    Maintainers usually reply within 3 days

  • Try to simplify cooling water
    Open
    speculative

    Difficulty 5/5 Over a week Newbie friendliness 8/100

    ReEDS-Model/ReEDS#40 ·

    Maintainers usually reply within 3 days

  • Add seed stress period(s) for lowest-temperature or highest-outage-rate days
    Open

    Difficulty 5/5 Over a week Newbie friendliness 18/100

    ReEDS-Model/ReEDS#39 ·

    Maintainers usually reply within 3 days

  • Compare cases and plotting changes
    Open
    bug enhancement TODO

    Difficulty 5/5 Over a week Newbie friendliness 15/100

    ReEDS-Model/ReEDS#34 ·

    Maintainers usually reply within 3 days

  • Fix intertemporal and window modes
    Open

    Difficulty 5/5 Over a week Newbie friendliness 12/100

    ReEDS-Model/ReEDS#33 ·

    Maintainers usually reply within 3 days

  • Create a "bring-your-own-data" example
    Open
    documentation

    Difficulty 5/5 Over a week Newbie friendliness 15/100

    ReEDS-Model/ReEDS#31 ·

    Maintainers usually reply within 3 days

  • Filter out upgrades from EIA-NEMS database before using to guide ReEDS2PRAS unit capacities
    Open

    Difficulty 3/5 1-2 days Newbie friendliness 38/100

    ReEDS-Model/ReEDS#29 ·

    Maintainers usually reply within 3 days

  • Offshore zones: Finish development and cleanup
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    ReEDS-Model/ReEDS#28 ·

    Maintainers usually reply within 3 days

  • Offshore wind zones incompatible with custom regions
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 22/100

    ReEDS-Model/ReEDS#27 ·

    Maintainers usually reply within 3 days

  • Split up the objective function into smaller pieces
    Open

    Difficulty 5/5 Over a week Newbie friendliness 22/100

    ReEDS-Model/ReEDS#24 ·

    Maintainers usually reply within 3 days

  • State-level capacity mandates are applied in full when running with only a portion of a state
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 24/100

    ReEDS-Model/ReEDS#23 · 1 comment ·

    Maintainers usually reply within 3 days

  • ReEDS2PRAS: Model energy-limited techs like reservoir hydro
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    ReEDS-Model/ReEDS#15 ·

    Maintainers usually reply within 3 days

  • Update battery outage rate
    Open
    good first issue

    Difficulty 3/5 1-2 days Newbie friendliness 30/100

    ReEDS-Model/ReEDS#13 ·

    Maintainers usually reply within 3 days

  • Standardize the definition of seasons
    Open

    Difficulty 4/5 Over a week Newbie friendliness 22/100

    ReEDS-Model/ReEDS#11 ·

    Maintainers usually reply within 3 days

  • Clean up financial inputs
    Open

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    ReEDS-Model/ReEDS#10 ·

    Maintainers usually reply within 3 days

  • Remove `val_r_all.csv`
    Open

    Difficulty 3/5 1-2 days Newbie friendliness 42/100

    ReEDS-Model/ReEDS#9 ·

    Maintainers usually reply within 3 days

  • FINITO linkage
    May be free again @mmowers claimed this 136 days ago, and no pull request is open. Open

    ReEDS-Model/ReEDS#8 · 2 assignees ·

    Maintainers usually reply within 3 days

  • Updates to reeds_to_rev and land_use_analysis
    May be free again @shashwatsharma24 claimed this 123 days ago, and no pull request is open. Open

    ReEDS-Model/ReEDS#6 · 1 comment · 1 assignee ·

    Maintainers usually reply within 3 days

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