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    Imo State

    Rooftop solar in Owerri West, Imo: what the roofs are worth

    Owerri West has 101,430 buildings with a viable rooftop and 2.61 GWp of roof capacity. 47% run a generator, and together they spend ₦36.5bn a year on energy.

    Viable buildings

    101,430

    Usable roof area

    11.6 km²

    2.61 GWp roof capacity

    Energy spend

    ₦36.5bn/yr

    33 GWh/yr burned on generators

    Median payback

    4.4 yr

    Median IRR 25% (cash saved)

    The savings bracket for Owerri West

    Approach B

    Cash saved

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

    Current energy spend₦36.5bn/yr
    Year-one cash saved₦36.1bn
    Lifetime cash saved₦1.92tn
    NPV₦286bn
    Median IRR25%
    Median payback4.4 yr
    Unlocked energy30.8 GWh/yr
    Approach A

    Energy value (upper bracket)

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

    Installed capacity128 MWp
    Capex₦123bn
    Year-one energy value₦87.3bn
    Lifetime energy value₦4.11tn
    NPV₦669bn
    Median IRR79%
    Median payback1.4 yr

    Three ways to size Owerri West'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
    128 MWp
    Capital cost
    ₦123bn
    Year 1 savings
    ₦87.3bn/yr
    NPV
    ₦669bn
    Median IRR
    79%
    Median payback
    1.4 yr

    The odds a rooftop in Owerri West pays back quickly

    Of the 96,751 buildings in Owerri West with a modelled payback, 64.5% pay back inside five years and 41.7% inside three.

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    How much of Owerri West's demand actually gets met

    Buildings in Owerri West consume 62.4 GWh/yr but want 93.3 GWh/yr. The 33% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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    Electricity billing bands in Owerri West

    Loading band economics…

    How many rooftops in Owerri West 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 96,751 buildings with a modelled result out of 101,430 in Owerri West. 75,120 clear a positive NPV.

    Payback

    Under 3 years40,327 (42%)
    Under 5 years62,445 (65%)
    Under 7 years74,987 (78%)
    Under 10 years84,629 (87%)

    Return (IRR)

    Above 10%83,247 (82%)
    Above 15%75,120 (74%)
    Above 20%65,687 (65%)
    Above 25%46,559 (46%)
    CO₂ avoided

    67.1 kt/yr

    Fuel avoided

    17.3 million litres/yr

    Energy unlocked

    30.8 GWh/yr

    Demand that is suppressed today

    People served

    128k

    What hardware costs right now

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

    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 Owerri West

    Electricity billing band

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    B34,19615,954₦12bn₦12bn25%4.4 yr
    C32,61313,895₦11.7bn₦11.5bn25%4.4 yr
    A12,3385,130₦3.28bn₦3.27bn25%4.4 yr
    D11,6117,860₦4.8bn₦4.76bn67%1.6 yr
    E10,6725,302₦4.68bn₦4.64bn31%3.1 yr

    Load profile

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    Residential98,70346,619₦23.1bn₦22.9bn25%4.4 yr
    Commercial General1,279697₦5.28bn₦5.26bn37%2.9 yr
    Commercial Retail622310₦344m₦344m33%3.4 yr
    Anchor513336₦7.21bn₦7.04bn49%2.1 yr
    Worship187102₦147m₦147m39%2.6 yr
    Industrial7346₦290m₦289m41%2.6 yr
    Hospitality2616₦129m₦129m37%2.9 yr
    Filling Station2014₦35.3m₦35.3m45%2.4 yr
    Productive Use50₦1.02m₦1.02m33%3.4 yr
    Automotive11₦379k₦379k31%3.6 yr
    Mall Retail10₦102k₦102k33%3.4 yr

    Roof size band

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    100 250m235,12317,085₦10.7bn₦10.7bn25%4.4 yr
    50 100m219,4208,876₦1.56bn₦1.56bn19%5.4 yr
    Under 30m219,3578,920₦698m₦692m15%5.4 yr
    250 1000m215,1777,505₦16bn₦15.9bn25%4.1 yr
    30 50m212,0795,602₦632m₦631m19%5.4 yr
    Over 1000m2274153₦6.87bn₦6.68bn45%2.4 yr

    Settlement type

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    Urban Centre66,18730,756₦19.5bn₦19.4bn25%4.4 yr
    Urban15,49910,157₦11.3bn₦11.1bn59%1.9 yr
    Dense Urban11,4163,096₦2.71bn₦2.64bn19%5.1 yr
    Unclassified7,5643,494₦2.77bn₦2.77bn25%4.4 yr
    Rural764638₦197m₦197m69%1.6 yr

    Building type

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B) Median IRR Median payback
    Residential Formal32,33610,716₦1.99bn₦1.99bn21%4.6 yr
    Residential21,76913,203₦17.2bn₦17.1bn57%1.9 yr
    Residential Small18,52010,996₦2.04bn₦2.04bn49%1.9 yr
    Shed12,9627,543₦827m₦827m51%2.1 yr
    Residential Informal7,3422,234₦643m₦643m23%4.6 yr
    Apartment3,9201,267₦215m₦215m23%4.6 yr
    Duplex1,850657₦103m₦103m23%4.6 yr
    Kiosk Shop606290₦86.6m₦86.6m33%3.4 yr
    Commercial Corridor538198₦1.24bn₦1.24bn35%3.1 yr
    Institutional358241₦5.6bn₦5.51bn43%2.6 yr
    Commercial315233₦2.67bn₦2.65bn43%2.6 yr
    Educational Facility14893₦531m₦531m57%1.9 yr

    Land use

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B)
    (Unset)100,86547,937₦34.5bn₦34.2bn
    Retail28171₦414m₦414m
    Commercial215102₦1.36bn₦1.32bn
    Farmyard3929₦16.3m₦16.3m
    Industrial302₦176m₦176m

    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
    Standard99,94847,294₦24.8bn₦24.7bn25%4.4 yr
    SME High906472₦4.24bn₦4.22bn37%2.9 yr
    Enterprise576375₦7.43bn₦7.26bn47%2.1 yr

    Demand tier

    SegmentBuildings With generator Spend ₦/yr Cash saved yr 1 (B)
    4.042,00912,988₦5.32bn₦5.26bn
    3.036,11521,911₦26.3bn₦26bn
    0.012,8457,527₦822m₦822m
    2.08,9704,987₦1.11bn₦1.1bn
    1.0994482₦61.4m₦61.4m
    5.0341151₦1.22bn₦1.22bn
    6.015695₦1.67bn₦1.65bn

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

    Nearby LGAs in Imo

    Owerri North103,592 buildingsMbatoli98,805 buildingsOrlu86,065 buildingsOwerri Municipal77,944 buildingsIdeato North74,322 buildingsAboh-Mbaise70,387 buildingsOru West64,792 buildingsOhaji/Egbema63,574 buildingsNgor-Okpala61,667 buildingsIkeduru61,555 buildingsEhime-Mbano59,753 buildingsOru East57,424 buildings