Source
doi:10.1080/03036758.2024.2446746 — original publication (opens in a new tab; the file is not redistributed)
Apperley et al. (2024) — Smart Community Microgrids in Aotearoa’s Energy Future
Peer-reviewed NZ microgrid design study — the primary behind CR_012's Motairehe figures
Apperley, Viggers, Walmsley, R. Chapman, Howden-Chapman, Penny, Shearer & Taptiklis (2024, Journal of the Royal Society of New Zealand, submitted 5 Dec 2024). A review + three NZ case studies (islanded Māori community, 30-house residential, factory-centred town) of smart community microgrids. Carries NZ stand-alone sizing rules-of-thumb, the value of intra-community sharing (97% shortfall reduction), grid-reduction figures, and the electrification→microgrid case — plus governance/equity/regulatory analysis (mātauranga Māori, papakāinga, tax treatment of energy rebates). MBIE Endeavour (Public Housing & Urban Regeneration) + SSIF (Ahuora process-heat) funded.
Summary
The paper argues distributed wind/solar community microgrids are a cost-effective, equitable pathway to the ~doubling of NZ electricity demand to 2050, by co-locating generation with load (cutting backbone-grid investment and transmission losses) — but require rethinking the legacy-grid model and regulatory/business frameworks. Three worked NZ case studies span the scale range: an off-grid Māori community (Motairehe, Aotea/Great Barrier), a 30-house grid-connected residential group, and a factory-centred town with industry, housing, commerce and EV transport. Across all three, local consumption of local generation reduces grid load and peaks, intra-community sharing markedly cuts supply shortfalls, and load diversity improves the generation/demand balance.
Key claims
- claim: "NZ stand-alone solar sizing rules-of-thumb (stated for Aotearoa): solar panel capacity ≈ average daily load ÷ 4; battery capacity ≈ average daily base load × 3. Applied at Motairehe: each of 10 houses + marae sized at 4 kW solar + 22.5 kWh battery, on an average daily base load of 7.5 kWh (avg full load 16 kWh). A discretionary/divertible load (e.g. hot water, EV) of up to 5 kWh/site/day was invoked only above 95% battery charge."
source_location: "§3.1 (Islanded Community Microgrid, sizing rules)"
- claim: "Motairehe islanded microgrid (Aotea/Great Barrier Is., Māori community, 10 houses + marae, no grid connection, 8760-hr hourly model): moving from standalone systems (Phase 1) to a shared community microgrid (Phase 2) cut total shortfall hours by ~97% — from the marae's 2,184 hrs (25% of year) and the houses' 355 hrs combined, down to 64 hrs (<1% of year), only 16 coinciding with hui. Standalone Phase 1: 4 of 10 houses had zero shortfall; worst house 317 hrs (3.6%); wasted surplus solar 18.8 MWh/yr (26% of generation). Microgrid surplus 3,309 hrs (38%), 33.2 MWh/yr."
source_location: "§3.1 (Phase 1 vs Phase 2 results)"
- claim: "30-house grid-connected residential microgrid (2.5 kW solar + 12 kWh battery per house; real 8760-hr profiles): average total daily consumption 546 kWh = 18.2 kWh/house/day (22.7 kWh/hr community; 0.76 kWh/house/hr). The microgrid cut average daily grid draw 59% (546→224 kWh), peak daily grid 33% (953→638 kWh), and annual hourly peak 21% (92→73 kWh). >50% of hours (4,599) had demand fully met locally; all locally generated electricity was locally consumed. Note: peak (the metric the grid connection must be sized for) falls least (21%), so grid fixed costs spread over fewer kWh → possible higher per-kWh/per-connection charge."
source_location: "§3.2 (Residential Community Microgrid)"
- claim: "Factory-centred energy community (meat factory processing >2M animals/yr + adjacent town ~6,000 houses / 3,000 EVs / commercial): combined fully-electrified load 168 GWh/yr, winter peak 34 MW. Components — factory 71.1 GWh/yr (20% lower after electrification: 9.7 GWh process + 61.4 GWh hot water via high-temp heat pumps + electro-boilers); residential 41.9 GWh (12.3 MW winter peak); commercial 28.8 GWh (7.5 MW); transport 26.1 GWh. A NetZEB design (solar sized to the 168 GWh annual load) + ~400 MWh battery minimises grid demand to ~10% of supply; load diversity (industrial+residential+commercial) improves local balance."
source_location: "§3.3 (Factory-Centred Energy Community; Figure 8)"
- claim: "National framing + design/governance principles: Transpower (2023) projects NZ electricity demand +68% by 2050 but +137% generation capacity needed (non-dispatchable renewables). Smart-control dispatch priority per node: (i) local base load → (ii) local battery charging → (iii) microgrid/community needs → (iv) local discretionary load. Barriers flagged: legacy-grid/regulatory/business models don't motivate community energy; uncertainty over the size at which a microgrid becomes a 'commercial entity'; energy rebates may count as taxable income (Aperahama et al. 2025); equity between early/late adopters; community formation (marae/papakāinga have pre-existing community; others need building) and mātauranga Māori."
source_location: "§2, §4, §5, §6"Neobiome Intelligence relevance
A peer-reviewed NZ design study that both validates and sanity-checks the NI engine. (1) The stand-alone sizing rules (solar ≈ load÷4, battery ≈ base-load×3) are a direct cross-check on the model’s PV×battery sweep (D15) — an independent NZ heuristic for plausible portfolio sizes. (2) The 97% shortfall reduction from intra-community sharing is empirical support for NI’s core coupling assumption — that the community pools generation/storage (D9) rather than per-household islands; it quantifies the value the pooling delivers. (3) 18.2 kWh/house/day corroborates the demand baseline (cf. RD_020 7,172 kWh/dwelling/yr ≈ 19.6 kWh/day all-fuels). (4) The factory case validates the heat-pump electrification coupling (process heat → electricity via high-temp heat pumps/electro-boilers; the model’s heat-pump flow rows, D8) and the all-electric load build (incl. EV). (5) The dispatch priority order (local load → battery → community → discretionary) matches NI’s slice-dispatch logic (D19), and the peak-falls-least finding (21% vs 59%) reinforces the reticulation/grid-connection cost story (CR_027). Thesis value: community ownership/governance, equity, regulatory/tax barriers, mātauranga Māori, papakāinga, and well-being framing (the MBIE Public Housing Endeavour grant) — strong material for the governance/resilience chapters.
Research targets
Documents to retrieve
- RT_244 (resolved → LIT_085): Apperley & Toki (2023) An Islanded Community Solar Microgrid with Capability of Future Fractal Growth (Energy 2023 Conf, IARIA, pp. 29–35) — the primary conference paper behind the Motairehe design/figures.
- RT_245 (new): Barrett & Watt (2023) Snapshot Evaluation of the Maniapoto Solar Energy Sovereignty Project (Solar Sense Ltd, Hamilton) — a NZ Māori community-solar case (energy sovereignty).
- RT_246 (new): Aperahama, Penny & Taptiklis (2025) Distributed Renewable Energy, Equity and Energy Sharing in Aotearoa (book chapter) — equity + energy-sharing schemes + the rebate-taxation issue (thesis governance).
Research gaps
- Berka (2020) community-energy NZ already tracked as RT_218 (not re-added).
Connections
Links to
Referenced by
Sources (3): LIT_078 · LIT_084 · LIT_085
EDT domains (1): D01: Renewable Energy & Storage Systems