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    Anambra State

    Rooftop solar in Oyi, Anambra: what the roofs are worth

    Oyi has 75,546 buildings with a viable rooftop and 1.83 GWp of roof capacity. 63% run a generator, and together they spend ₦69.2bn a year on energy.

    Viable buildings

    75,546

    Usable roof area

    8.16 km²

    1.83 GWp roof capacity

    Energy spend

    ₦69.2bn/yr

    62.9 GWh/yr burned on generators

    Median payback

    2.9 yr

    Median IRR 39% (cash saved)

    The savings bracket for Oyi

    Approach B

    Cash saved

    What these buildings stop paying — merit order, capped at current spend.

    Current energy spend₦69.2bn/yr
    Year-one cash saved₦68.6bn
    Lifetime cash saved₦3.62tn
    NPV₦541bn
    Median IRR39%
    Median payback2.9 yr
    Unlocked energy52.4 GWh/yr
    Approach A

    Energy value (upper bracket)

    What the energy is worth if full latent demand were met. Not cash saved.

    Installed capacity201 MWp
    Capex₦194bn
    Year-one energy value₦138bn
    Lifetime energy value₦6.47tn
    NPV₦1.05tn
    Median IRR81%
    Median payback1.4 yr

    Three ways to size Oyi's rooftops

    Solar + battery. The default headline scenario, and the one the SEO fact base quotes. Prices the energy a full solar+storage system would deliver.

    Baseline: mixed
    Counterfactual: grid when available, generator otherwise, weighted by the NTL-derived grid availability. The realistic case, and what the headline numbers use. Always falls between grid and genset by construction.

    Read with care: Sized to LATENT demand — the energy the building would use if it could. Against a cash baseline that only reflects today's spend this looks oversized; that is what sc3 exists to fix.

    System size
    201 MWp
    Capital cost
    ₦194bn
    Year 1 savings
    ₦138bn/yr
    NPV
    ₦1.05tn
    Median IRR
    81%
    Median payback
    1.4 yr

    The odds a rooftop in Oyi pays back quickly

    Of the 75,313 buildings in Oyi with a modelled payback, 83.8% pay back inside five years and 52.2% inside three.

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    How much of Oyi's demand actually gets met

    Buildings in Oyi consume 121 GWh/yr but want 173 GWh/yr. The 30% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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    Electricity billing bands in Oyi

    Loading band economics…

    How many rooftops in Oyi actually pay

    Counted building by building on the cash-saved basis (merit-order sized, valued against what the building spends today), not read off an average. Shares are of the 75,313 buildings with a modelled result out of 75,546 in Oyi. 70,352 clear a positive NPV.

    Payback

    Under 3 years39,306 (52%)
    Under 5 years63,142 (84%)
    Under 7 years70,316 (93%)
    Under 10 years73,209 (97%)

    Return (IRR)

    Above 10%72,868 (96%)
    Above 15%70,352 (93%)
    Above 20%65,239 (86%)
    Above 25%56,783 (75%)
    CO₂ avoided

    125 kt/yr

    Fuel avoided

    32.2 million litres/yr

    Energy unlocked

    52.4 GWh/yr

    Demand that is suppressed today

    People served

    205k

    What hardware costs right now

    Median advertised rates from our Nigerian market tracker — the same prices used to cost a system in Oyi.

    Solar panels

    ₦250

    ₦/W

    Inverters

    ₦127,419

    ₦/kVA

    Batteries

    ₦177,500

    ₦/kWh

    Full price tracker Size a home system Size a business system

    Building mix in Oyi

    Electricity billing band

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    B44,15326,730₦39.3bn₦39.1bn37%2.9 yr
    A15,96311,228₦8.07bn₦8bn35%3.1 yr
    C14,0549,104₦18.4bn₦18.1bn55%1.9 yr
    D839414₦1.39bn₦1.33bn27%4.1 yr
    E537234₦2.07bn₦1.99bn25%4.4 yr

    Load profile

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    Residential71,19244,359₦43.2bn₦42.7bn37%2.9 yr
    Commercial General2,2401,791₦11.5bn₦11.4bn47%2.4 yr
    Commercial Retail1,086752₦211m₦211m43%2.6 yr
    Industrial534416₦3.51bn₦3.5bn55%1.9 yr
    Anchor338261₦10.5bn₦10.4bn47%2.4 yr
    Worship119102₦162m₦162m43%2.4 yr
    Filling Station2014₦27.4m₦27.2m47%2.1 yr
    Hospitality1514₦143m₦139m47%2.4 yr
    Automotive10₦113k₦113k29%3.6 yr
    Productive Use11₦3.39m₦3.39m45%2.4 yr

    Roof size band

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    100 250m227,41517,291₦22.5bn₦22.2bn39%2.6 yr
    50 100m215,5359,659₦3.47bn₦3.34bn39%2.9 yr
    Under 30m213,7788,542₦793m₦787m31%3.4 yr
    30 50m29,6395,908₦974m₦974m35%3.1 yr
    250 1000m28,9726,155₦29.1bn₦28.9bn45%2.4 yr
    Over 1000m2207155₦12.4bn₦12.4bn51%2.1 yr

    Settlement type

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    Urban Centre67,19642,723₦56.7bn₦56.3bn37%2.9 yr
    Urban4,4772,862₦7.42bn₦7.38bn49%2.1 yr
    Unclassified3,6731,934₦4.82bn₦4.57bn31%3.4 yr
    Dense Urban200191₦301m₦301m59%1.9 yr

    Building type

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    Residential Formal20,39812,771₦4.38bn₦4.38bn29%3.6 yr
    Residential Small16,55410,578₦4.14bn₦3.88bn51%2.1 yr
    Residential16,34010,586₦32bn₦31.8bn55%1.9 yr
    Shed9,6065,674₦661m₦661m47%2.4 yr
    Residential Informal3,9152,042₦1.16bn₦1.16bn25%4.4 yr
    Apartment2,6281,586₦464m₦464m31%3.4 yr
    Duplex1,434915₦313m₦313m33%3.4 yr
    Commercial1,2141,031₦7.49bn₦7.49bn49%2.1 yr
    Kiosk Shop1,087753₦215m₦215m43%2.6 yr
    Institutional661525₦10.7bn₦10.7bn43%2.6 yr
    Industrial Site448359₦2.96bn₦2.96bn55%1.9 yr
    Agricultural317207₦90.9m₦90.9m55%1.9 yr

    Land use

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B)
    (Unset)73,36146,607₦62.7bn₦62.1bn
    Industrial2,1751,097₦5.87bn₦5.87bn
    Farmyard66₦625m₦625m
    Farmland40₦273k₦273k

    Not published for this cube: Median IRR, Median payback.

    Lead segment

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    Standard73,16045,798₦46.5bn₦46bn37%2.9 yr
    SME High1,5221,242₦8.77bn₦8.76bn49%2.1 yr
    Enterprise864670₦13.9bn₦13.8bn51%2.1 yr

    Demand tier

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B)
    3.029,83719,179₦44.7bn₦44.1bn
    4.026,12416,377₦14.9bn₦14.8bn
    0.09,6265,725₦700m₦700m
    2.07,3484,668₦1.53bn₦1.53bn
    1.01,535878₦165m₦165m
    5.0760612₦2.43bn₦2.43bn
    6.0316271₦4.89bn₦4.89bn

    Not published for this cube: Median IRR, Median payback.

    Nearby LGAs in Anambra

    Aguata126,908 buildingsIhiala121,337 buildingsIdemili North112,222 buildingsAwka South108,869 buildingsNnewi South96,092 buildingsNnewi North81,018 buildingsIdemili South79,895 buildingsAnaocha77,690 buildingsOrumba North55,808 buildingsOnitsha North55,279 buildingsAnambra East52,794 buildingsEkwusigo51,318 buildings