Katsina State

Rooftop solar in Rimi, Katsina: what the roofs are worth

Rimi has 122,493 buildings with a viable rooftop and 1.28 GWp of roof capacity. 42% run a generator, and together they spend ₦96.8bn a year on energy.

Viable buildings

122,493

Usable roof area

5.76 km²

1.28 GWp roof capacity

Energy spend

₦96.8bn/yr

97.8 GWh/yr burned on generators

Median payback

3.9 yr

Median IRR 27% (cash saved)

The savings bracket for Rimi

Approach B

Cash saved

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

Current energy spend₦96.8bn/yr

Year-one cash saved₦82.2bn

Lifetime cash saved₦4.12tn

NPV₦659bn

Median IRR27%

Median payback3.9 yr

Unlocked energy53.1 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity195 MWp

Capex₦205bn

Year-one energy value₦180bn

Lifetime energy value₦8.24tn

NPV₦1.4tn

Median IRR103%

Median payback1.1 yr

Three ways to size Rimi'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: 195 MWp
Capital cost: ₦205bn
Year 1 savings: ₦180bn/yr
NPV: ₦1.4tn
Median IRR: 103%
Median payback: 1.1 yr

The odds a rooftop in Rimi pays back quickly

Of the 121,145 buildings in Rimi with a modelled payback, 59.9% pay back inside five years and 41.9% inside three.

Create a free account

How much of Rimi's demand actually gets met

Buildings in Rimi consume 189 GWh/yr but want 243 GWh/yr. The 22% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

Create a free account

Electricity billing bands in Rimi

Loading band economics…

How many rooftops in Rimi 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 121,145 buildings with a modelled result out of 122,493 in Rimi. 86,125 clear a positive NPV.

Payback

Under 3 years50,706 (42%)

Under 5 years72,510 (60%)

Under 7 years86,270 (71%)

Under 10 years98,082 (81%)

Return (IRR)

Above 10%95,225 (78%)

Above 15%86,125 (70%)

Above 20%77,444 (63%)

Above 25%64,000 (52%)

CO₂ avoided

140 kt/yr

Fuel avoided

35.3 million litres/yr

Energy unlocked

53.1 GWh/yr

Demand that is suppressed today

People served

225k

What hardware costs right now

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

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 Rimi

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
D	35,374	17,171	₦35.1bn	₦29.3bn	33%	3.4 yr
C	29,998	12,417	₦24.5bn	₦20.8bn	25%	4.4 yr
B	24,086	12,282	₦17.1bn	₦14.6bn	33%	3.4 yr
E	23,565	9,042	₦14.4bn	₦12.1bn	23%	4.6 yr
A	9,470	1,032	₦5.7bn	₦5.49bn	21%	4.9 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	121,131	50,871	₦34.3bn	₦33.5bn	27%	4.1 yr
Anchor	831	647	₦60.2bn	₦46.5bn	65%	1.6 yr
Commercial General	211	165	₦2.08bn	₦1.97bn	57%	1.9 yr
Commercial Retail	200	170	₦46.2m	₦46.2m	59%	1.9 yr
Worship	92	82	₦91.3m	₦91.3m	61%	1.6 yr
Industrial	27	9	₦21.6m	₦21.6m	39%	2.6 yr
Hospitality	1	0	₦375k	₦375k	39%	2.9 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	59,794	22,595	₦2.12bn	₦2.12bn	19%	5.4 yr
30 50m2	28,197	12,383	₦1.72bn	₦1.72bn	25%	4.4 yr
50 100m2	18,708	8,949	₦2.16bn	₦2.16bn	31%	3.4 yr
100 250m2	8,550	4,160	₦5.27bn	₦4.65bn	33%	3.4 yr
250 1000m2	5,676	2,892	₦16.6bn	₦16.5bn	47%	2.1 yr
Over 1000m2	1,568	965	₦68.9bn	₦55.1bn	59%	1.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	84,281	42,726	₦75.1bn	₦63bn	35%	2.9 yr
Dense Urban	20,999	7,532	₦15bn	₦13.5bn	25%	4.4 yr
Unclassified	12,790	724	₦4.12bn	₦3.64bn	7%	13.6 yr
Rural	4,423	962	₦2.51bn	₦2.06bn	21%	5.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	66,849	26,499	₦2.97bn	₦2.97bn	21%	4.9 yr
Residential Informal	31,342	13,438	₦8.3bn	₦8.29bn	31%	3.4 yr
Residential Small	14,438	6,540	₦1.91bn	₦1.91bn	31%	3.4 yr
Residential	8,502	4,394	₦21.1bn	₦20.4bn	67%	1.6 yr
Institutional	671	513	₦59.7bn	₦46.1bn	59%	1.9 yr
Kiosk Shop	200	170	₦46.2m	₦46.2m	59%	1.9 yr
Educational Facility	112	88	₦205m	₦205m	81%	1.4 yr
School	91	69	₦166m	₦166m	75%	1.4 yr
Healthcare Facility	65	53	₦896m	₦716m	55%	1.9 yr
Clinic	51	48	₦177m	₦176m	59%	1.9 yr
Commercial Corridor	48	44	₦744m	₦723m	61%	1.6 yr
Worship Center	33	29	₦24.2m	₦24.2m	63%	1.6 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	122,477	51,942	₦96.8bn	₦82.2bn
Industrial	11	0	₦288k	₦288k
Farmland	3	0	₦53.2k	₦53.2k
Farmyard	2	2	₦806k	₦806k

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	121,594	51,243	₦35.3bn	₦34.5bn	27%	3.9 yr
Enterprise	844	652	₦60.2bn	₦46.6bn	63%	1.6 yr
SME High	55	49	₦1.2bn	₦1.12bn	61%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	59,208	23,558	₦2.64bn	₦2.64bn
2.0	22,774	9,637	₦2.31bn	₦2.31bn
3.0	16,599	8,027	₦45.8bn	₦38bn
1.0	15,937	6,853	₦941m	₦941m
4.0	7,962	3,859	₦44.1bn	₦37.4bn
5.0	12	10	₦963m	₦886m
6.0	1	0	₦29.1m	₦24.7m