Nigeria rooftop solar data

Rooftop solar in Enugu State: buildings, spend and payback

1,305,748 buildings in Enugu State carry a viable rooftop. Together they spend ₦404bn a year on grid power and generator fuel, and 20% of them run a generator.

Viable buildings

1,305,748

Usable roof area

113 km²

25.3 GWp of roof capacity

Current energy spend

₦404bn/yr

326 GWh/yr from generators

Median payback

4.9 yr

Median IRR 23% (cash saved)

The savings bracket for Enugu

Approach B

Cash saved

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

Current energy spend₦404bn/yr

Year-one cash saved₦399bn

Lifetime cash saved₦21.9tn

NPV₦3.21tn

Median IRR23%

Median payback4.9 yr

Unlocked energy491 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity2.38 GWp

Capex₦2.35tn

Year-one energy value₦1.85tn

Lifetime energy value₦87.7tn

NPV₦14.5tn

Median IRR95%

Median payback1.1 yr

Three ways to size Enugu State'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: 2.38 GWp
Capital cost: ₦2.35tn
Year 1 savings: ₦1.85tn/yr
NPV: ₦14.5tn
Median IRR: 95%
Median payback: 1.1 yr

The odds a rooftop in Enugu State pays back quickly

Of the 1,285,315 buildings in Enugu State with a modelled payback, 52.5% pay back inside five years and 18.1% inside three.

Payback under 5 years

52.5%

Payback under 3 years

18.1%

IRR above 20%

56.4%

Under 3 years · 18%3 – 5 years · 34%5 – 7 years · 18%7 – 10 years · 11%Over 10 years · 19%

Coverage: 98% of buildings in Enugu State produced a payback figure. Buildings with no viable scenario are excluded rather than counted as zero.

How much of Enugu State's demand actually gets met

Buildings in Enugu State consume 799 GWh/yr but want 1.29 TWh/yr. The 38% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

Met today · 62%Suppressed · 38%

Energy wanted

1.29 TWh/yr

Energy consumed

799 GWh/yr

Unmet demand

491 GWh/yr

Modelled latent demand, not metered consumption. It is the load buildings would run given affordable, available supply.

How many rooftops in Enugu State 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 1,285,315 buildings with a modelled result out of 1,305,748 in Enugu State. 903,174 clear a positive NPV.

Payback

Under 3 years233,030 (18%)

Under 5 years675,424 (53%)

Under 7 years901,455 (70%)

Under 10 years1,042,507 (81%)

Return (IRR)

Above 10%1,016,849 (78%)

Above 15%903,174 (69%)

Above 20%736,785 (56%)

Above 25%548,242 (42%)

Electricity billing bands in Enugu State

Loading band economics…

What a delivered unit costs, by DisCo

Grid tariff plus the generator running that fills the gap, blended across every building the DisCo serves. Ranked most expensive first — the higher the all-in rate, the stronger the case for solar.

Loading the league table…

Ikeja and Eko are reported together as Lagos. Rates are modelled blends of billed grid energy and generator running, not published tariffs.

What hardware costs right now

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

Solar panels

₦250

₦/W

Inverters

₦127,419

₦/kVA

Batteries

₦177,500

₦/kWh

Full price tracker Size a home system Size a business system

Where the opportunity sits

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	323,565	63,452	₦99bn	₦97.7bn	21%	5.1 yr
E	284,247	58,721	₦89.2bn	₦87.3bn	21%	5.1 yr
C	280,676	50,622	₦70.4bn	₦69.7bn	21%	5.1 yr
A	255,726	40,483	₦85.6bn	₦85.3bn	25%	4.4 yr
B	161,534	41,667	₦59.9bn	₦59.4bn	25%	4.4 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	1,247,720	229,784	₦261bn	₦258bn	21%	4.9 yr
Commercial General	27,907	11,460	₦63.5bn	₦63.4bn	35%	3.1 yr
Commercial Retail	13,775	4,185	₦1.31bn	₦1.31bn	33%	3.4 yr
Anchor	9,882	6,121	₦64.3bn	₦63.6bn	51%	2.1 yr
Industrial	3,564	2,325	₦9.29bn	₦9.09bn	59%	1.9 yr
Worship	1,539	759	₦1.24bn	₦1.24bn	35%	3.1 yr
Hospitality	735	91	₦2.89bn	₦2.79bn	33%	3.1 yr
Filling Station	412	201	₦300m	₦300m	35%	3.1 yr
Mall Retail	111	10	₦226m	₦226m	33%	3.1 yr
Productive Use	79	6	₦53.1m	₦53.1m	33%	3.1 yr
Automotive	24	3	₦23.6m	₦23.6m	31%	3.6 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
100 250m2	392,200	83,999	₦142bn	₦140bn	25%	4.4 yr
50 100m2	315,658	56,141	₦26.8bn	₦26.6bn	21%	5.1 yr
Under 30m2	297,634	51,765	₦5.45bn	₦5.43bn	7%	14.1 yr
30 50m2	198,111	34,263	₦6.95bn	₦6.79bn	13%	8.1 yr
250 1000m2	100,289	27,980	₦166bn	₦164bn	27%	4.1 yr
Over 1000m2	1,856	797	₦56.9bn	₦56.1bn	33%	3.4 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban Centre	609,942	108,771	₦152bn	₦151bn	23%	4.6 yr
Urban	362,207	86,302	₦146bn	₦145bn	23%	4.6 yr
Dense Urban	199,126	36,707	₦44.8bn	₦44.7bn	21%	5.1 yr
Unclassified	108,899	16,797	₦48.1bn	₦46.4bn	21%	5.1 yr
Rural	25,574	6,368	₦13.4bn	₦12.6bn	23%	4.9 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	352,234	80,007	₦205bn	₦202bn	25%	4.4 yr
Residential Small	341,480	70,598	₦31bn	₦30.7bn	21%	5.4 yr
Shed	288,804	46,382	₦4.43bn	₦4.43bn	7%	13.6 yr
Residential Informal	149,895	20,074	₦13.2bn	₦13.1bn	23%	4.6 yr
Residential Formal	113,385	12,418	₦7.23bn	₦7.22bn	23%	4.9 yr
Kiosk Shop	13,785	4,186	₦1.31bn	₦1.31bn	33%	3.4 yr
Commercial	8,789	3,685	₦23.6bn	₦23.4bn	35%	3.1 yr
Commercial Corridor	8,242	2,282	₦16.7bn	₦16.7bn	35%	3.1 yr
Institutional	7,674	5,105	₦49.7bn	₦49.7bn	51%	2.1 yr
Educational Facility	3,329	2,336	₦8.95bn	₦8.95bn	75%	1.4 yr
Unknown	3,030	652	₦4.77bn	₦4.77bn	31%	3.6 yr
Industrial Site	2,595	1,774	₦6.51bn	₦6.39bn	63%	1.6 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	1,304,112	254,122	₦403bn	₦398bn
Commercial	870	584	₦561m	₦561m
Retail	479	167	₦101m	₦101m
Industrial	227	31	₦746m	₦746m
Farmyard	38	33	₦92.4m	₦92.4m
Farmland	22	8	₦31.6m	₦31.6m

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

Lead segment

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Standard	1,274,679	240,479	₦289bn	₦286bn	23%	4.9 yr
SME High	18,079	6,241	₦42.4bn	₦42.2bn	35%	3.1 yr
Enterprise	12,990	8,225	₦72.6bn	₦71.7bn	51%	2.1 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
2.0	418,160	83,257	₦58.8bn	₦57.8bn
3.0	358,780	85,348	₦255bn	₦252bn
0.0	288,760	46,476	₦4.46bn	₦4.46bn
1.0	126,940	24,993	₦6.1bn	₦6.02bn
4.0	105,638	13,778	₦57.4bn	₦57.2bn
5.0	5,731	870	₦12.6bn	₦12.4bn
6.0	1,739	223	₦9.52bn	₦9.44bn