Rivers State

Rooftop solar in Degema, Rivers: what the roofs are worth

Degema has 9,372 buildings with a viable rooftop and 145 MWp of roof capacity. 41% run a generator, and together they spend ₦47.2bn a year on energy.

Viable buildings

9,372

Usable roof area

646,500 m²

145 MWp roof capacity

Energy spend

₦47.2bn/yr

38.2 GWh/yr burned on generators

Median payback

4.6 yr

Median IRR 25% (cash saved)

The savings bracket for Degema

Approach B

Cash saved

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

Current energy spend₦47.2bn/yr

Year-one cash saved₦37.1bn

Lifetime cash saved₦1.75tn

NPV₦279bn

Median IRR25%

Median payback4.6 yr

Unlocked energy8.05 GWh/yr

Approach A

Energy value (upper bracket)

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

Installed capacity67.1 MWp

Capex₦70.3bn

Year-one energy value₦53.7bn

Lifetime energy value₦2.41tn

NPV₦402bn

Median IRR79%

Median payback1.4 yr

Three ways to size Degema'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: 67.1 MWp
Capital cost: ₦70.3bn
Year 1 savings: ₦53.7bn/yr
NPV: ₦402bn
Median IRR: 79%
Median payback: 1.4 yr

The odds a rooftop in Degema pays back quickly

Of the 9,075 buildings in Degema with a modelled payback, 63.5% pay back inside five years and 42.0% inside three.

Create a free account

How much of Degema's demand actually gets met

Buildings in Degema consume 65.4 GWh/yr but want 73.4 GWh/yr. The 11% they cannot buy is suppressed demand — load that appears the moment supply is reliable.

Create a free account

Electricity billing bands in Degema

Loading band economics…

How many rooftops in Degema 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 9,075 buildings with a modelled result out of 9,372 in Degema. 6,680 clear a positive NPV.

Payback

Under 3 years3,816 (42%)

Under 5 years5,767 (64%)

Under 7 years6,660 (73%)

Under 10 years7,119 (78%)

Return (IRR)

Above 10%7,029 (75%)

Above 15%6,680 (71%)

Above 20%5,859 (63%)

Above 25%3,852 (41%)

CO₂ avoided

59.9 kt/yr

Fuel avoided

21.2 million litres/yr

Energy unlocked

8.05 GWh/yr

Demand that is suppressed today

People served

195k

What hardware costs right now

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

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 Degema

Electricity billing band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
B	3,743	2,642	₦21.2bn	₦19bn	47%	2.4 yr
C	2,527	1,134	₦20bn	₦16.2bn	25%	4.4 yr
E	1,759	14	₦1.41bn	₦526m	5%	15.4 yr
D	683	4	₦328m	₦291m	5%	15.1 yr
A	660	31	₦4.27bn	₦1.08bn	19%	5.6 yr

Load profile

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Residential	9,272	3,727	₦45.3bn	₦35.3bn	25%	4.6 yr
Anchor	66	65	₦1.64bn	₦1.58bn	63%	1.6 yr
Commercial General	33	32	₦225m	₦225m	47%	2.4 yr
Worship	1	1	₦2.2m	₦2.2m	45%	2.4 yr

Roof size band

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Under 30m2	2,988	893	₦265m	₦264m	13%	6.9 yr
50 100m2	2,159	773	₦3.63bn	₦3.31bn	25%	4.6 yr
100 250m2	1,918	1,216	₦19.1bn	₦15.1bn	45%	2.4 yr
30 50m2	1,732	533	₦621m	₦557m	19%	5.6 yr
250 1000m2	567	403	₦22bn	₦16.4bn	59%	1.9 yr
Over 1000m2	8	7	₦1.63bn	₦1.48bn	63%	1.6 yr

Settlement type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Unclassified	4,420	283	₦8.59bn	₦3.8bn	9%	9.1 yr
Urban	2,884	2,430	₦18.1bn	₦16.5bn	51%	2.1 yr
Rural	1,450	529	₦10.3bn	₦7.86bn	23%	4.6 yr
Dense Urban	617	583	₦10.2bn	₦8.92bn	57%	1.9 yr
Urban Centre	1	0	₦11.8k	₦11.8k	21%	5.4 yr

Building type

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)	Median IRR	Median payback
Shed	3,772	748	₦122m	₦122m	9%	9.1 yr
Residential Small	2,912	1,226	₦4.9bn	₦4.52bn	25%	4.4 yr
Residential	1,789	960	₦36.7bn	₦27.1bn	53%	2.1 yr
Residential Informal	799	793	₦3.61bn	₦3.57bn	43%	2.4 yr
Institutional	34	33	₦1bn	₦966m	47%	2.4 yr
Educational Facility	28	28	₦410m	₦410m	65%	1.6 yr
School	24	24	₦76.2m	₦76.2m	63%	1.6 yr
Healthcare Facility	5	5	₦210m	₦182m	43%	2.6 yr
Clinic	5	5	₦144m	₦143m	63%	1.6 yr
Hospital	2	1	₦22m	₦22m	25%	2.1 yr
Commercial	1	1	₦1.24m	₦1.24m	53%	2.1 yr
Worship Center	1	1	₦2.2m	₦2.2m	45%	2.4 yr

Land use

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
(Unset)	9,344	3,822	₦47bn	₦37bn
Industrial	28	3	₦207m	₦97.6m

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	9,306	3,760	₦45.6bn	₦35.5bn	25%	4.6 yr
Enterprise	66	65	₦1.64bn	₦1.58bn	63%	1.6 yr

Demand tier

Segment	Buildings	With generator	Spend ₦/yr	Cash saved yr 1 (B)
0.0	3,772	748	₦122m	₦122m
3.0	2,759	1,557	₦37.8bn	₦28.6bn
2.0	1,598	812	₦4.69bn	₦3.91bn
1.0	728	196	₦629m	₦508m
4.0	515	512	₦4.02bn	₦3.93bn