Plateau State

Rooftop solar in Riyom, Plateau: what the roofs are worth

Riyom has 53,584 buildings with a viable rooftop and 382 MWp of roof capacity. 13% run a generator, and together they spend ₦7.37bn a year on energy.

Viable buildings

53,584

Usable roof area

1.73 km²

382 MWp roof capacity

Energy spend

₦7.37bn/yr

6.86 GWh/yr burned on generators

Median payback

13.4 yr

Median IRR 9% (cash saved)

The savings bracket for Riyom

Approach B

Cash saved

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

Current energy spend₦7.37bn/yr

Year-one cash saved₦7.32bn

Lifetime cash saved₦394bn

NPV₦60.6bn

Median IRR9%

Median payback13.4 yr

Unlocked energy8.63 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity53.6 MWp

Capex₦56.1bn

Year-one energy value₦59.1bn

Lifetime energy value₦2.81tn

NPV₦484bn

Median IRR105%

Median payback0.9 yr

Three ways to size Riyom'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: 53.6 MWp
Capital cost: ₦56.1bn
Year 1 savings: ₦59.1bn/yr
NPV: ₦484bn
Median IRR: 105%
Median payback: 0.9 yr

The odds a rooftop in Riyom pays back quickly

Of the 53,060 buildings in Riyom with a modelled payback, 35.7% pay back inside five years and 13.3% inside three.

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How much of Riyom's demand actually gets met

Buildings in Riyom consume 13 GWh/yr but want 21.6 GWh/yr. The 40% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

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Electricity billing bands in Riyom

Loading band economics…

How many rooftops in Riyom 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 53,060 buildings with a modelled result out of 53,584 in Riyom. 21,040 clear a positive NPV.

Payback

Under 3 years7,051 (13%)

Under 5 years18,926 (36%)

Under 7 years21,059 (40%)

Under 10 years24,978 (47%)

Return (IRR)

Above 10%23,151 (43%)

Above 15%21,040 (39%)

Above 20%19,584 (37%)

Above 25%17,368 (32%)

CO₂ avoided

14.5 kt/yr

Fuel avoided

3.37 million litres/yr

Energy unlocked

8.63 GWh/yr

Demand that is suppressed today

People served

181k

What hardware costs right now

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

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 Riyom

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
C	22,947	3,027	₦3.23bn	₦3.23bn	7%	13.9 yr
D	15,678	2,145	₦1.81bn	₦1.81bn	9%	13.4 yr
E	13,947	1,300	₦1.68bn	₦1.63bn	9%	13.1 yr
B	995	353	₦613m	₦613m	29%	3.6 yr
A	17	5	₦37.6m	₦37.6m	29%	3.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	49,301	4,315	₦4.64bn	₦4.59bn	7%	13.9 yr
Commercial Retail	2,124	1,023	₦158m	₦158m	35%	3.1 yr
Commercial General	1,540	977	₦1.36bn	₦1.36bn	63%	1.6 yr
Anchor	292	244	₦1.01bn	₦1.01bn	61%	1.6 yr
Worship	275	242	₦180m	₦180m	63%	1.6 yr
Industrial	49	29	₦29.1m	₦29.1m	67%	1.6 yr
Filling Station	3	0	₦120k	₦120k	35%	3.1 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	27,650	2,625	₦274m	₦274m	5%	16.4 yr
30 50m2	11,681	1,376	₦415m	₦415m	9%	9.9 yr
50 100m2	10,139	1,619	₦1.77bn	₦1.74bn	29%	3.6 yr
100 250m2	3,520	953	₦2.45bn	₦2.43bn	31%	3.6 yr
250 1000m2	574	247	₦2.08bn	₦2.08bn	31%	3.4 yr
Over 1000m2	20	10	₦382m	₦382m	39%	1.9 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Urban	23,381	3,528	₦3.33bn	₦3.33bn	9%	13.1 yr
Dense Urban	15,030	1,575	₦1.65bn	₦1.65bn	11%	8.6 yr
Unclassified	9,270	932	₦1.32bn	₦1.32bn	5%	16.4 yr
Rural	5,903	795	₦1.08bn	₦1.02bn	7%	13.9 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	33,976	2,172	₦199m	₦199m	7%	15.6 yr
Residential Small	10,927	1,343	₦1.72bn	₦1.68bn	29%	3.6 yr
Residential	3,550	798	₦2.71bn	₦2.7bn	29%	3.6 yr
Kiosk Shop	2,124	1,023	₦158m	₦158m	35%	3.1 yr
Residential Informal	827	0	₦9.24m	₦9.24m	19%	5.6 yr
Commercial	706	503	₦825m	₦825m	65%	1.6 yr
Commercial Corridor	391	93	₦133m	₦133m	35%	2.9 yr
Institutional	276	226	₦777m	₦777m	59%	1.9 yr
Market	242	237	₦46m	₦46m	65%	1.6 yr
Worship Center	95	83	₦49.3m	₦49.3m	67%	1.6 yr
Place Of Worship	87	77	₦19.6m	₦19.6m	67%	1.6 yr
Educational Facility	86	68	₦141m	₦141m	89%	1.1 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	53,584	6,830	₦7.37bn	₦7.32bn

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	52,153	5,966	₦5.4bn	₦5.34bn	9%	13.6 yr
SME High	1,099	596	₦945m	₦945m	63%	1.6 yr
Enterprise	332	268	₦1.03bn	₦1.03bn	61%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	34,075	2,229	₦203m	₦203m
2.0	7,588	1,423	₦1.93bn	₦1.9bn
1.0	6,218	1,723	₦736m	₦722m
3.0	5,457	1,404	₦4.04bn	₦4.03bn
4.0	230	41	₦384m	₦384m
5.0	14	8	₦60.1m	₦60.1m
6.0	2	2	₦17.3m	₦17.3m