Free Tool · Watts Happening
Find out exactly what your energy bills will cost you over the next 25 years.
1
Enter your annual bill. See three inflation scenarios side by side.
2
See what solar, heat pumps and batteries would take off your total.
3
Get a personalised breakdown sent to your inbox — free.
The independent UK energy newsletter that doesn't work for the industry.
Figures: EPVS methodology · ONS RPI · Ofgem price cap data · MCS · Energy Saving Trust

Watts Happening — 25-Year Cost of Inaction Calculator

Free Tool · Watts Happening
Find out exactly what your energy bills will cost you over the next 25 years — in 90 seconds.
Real numbers. Three inflation scenarios. No fluff.
EPVS methodology · Ofgem data · Verified July 2026 · Free
Step 1 of 8 — your bill
Annual energy spend
What's your current annual energy bill?
Check your last 12 months of bills, or multiply your direct debit by 12.
£ —
Tap to enter your amount
Your 25-year projection
Your estimated 25-year energy spend
£0
—
7.04%
EPVS
baseline
9.8%
Post-2021
reality
12.5%
Crisis-
inclusive
Pay today
£0
Year 25 bill
£0
Total extra
£0
Scenario
7.04%

World events 2000–2026: financial crisis · 2021 supply shock · Russia–Ukraine war · Middle East conflict. A major energy price shock roughly every 4 years. The 7.04% figure assumes none of them.

Method: 9.8% = compound annual change in the Ofgem price cap, April 2021 (£1,138) to July 2026 (£1,862), like-for-like usage basis. 12.5% models the same trajectory plus one further 2022-scale shock.

Want to know what reduces this figure?
Your 25-year cost
£0
—
See what solar, heat pumps and battery storage would take off this figure
Enter your email — we'll show you system costs, current grants, and savings from your exact bill size.
✓ ✕
→
Savings based on your specific 25-year total
→
Current grant amounts including up to £9,000 BUS
→
Real system costs and payback periods
No spam · Unsubscribe any time
What reduces your number
How much of is avoidable?
Costs verified 20 July 2026 against MCS installation data, Energy Saving Trust and gov.uk. Savings assume a properly designed, correctly specified system. Payback periods indicative.
Question 1 of 5 — property
Property type
What type of property is this?
H
My home
Primary residence
R
A rental property
BTL, HMO or holiday let
B
My business premises
M
Multiple properties
Portfolio or mixed use
Question 2 of 5 — heating fuel
Primary heating fuel
How do you currently heat this property?
G
Gas boiler
Mains gas central heating
E
Electric heating
O
Oil or LPG
Off-grid heating
X
Mixed or other
Question 3 of 5 — EPC band
Energy Performance Certificate
What's the current EPC rating?
A
A or B
Very energy efficient
C
C
Average UK property
D
D
Below average — common in older stock
E
E, F or G
High improvement potential
?
Don't know
Question 4 of 5 — tariff status
Energy contract
What tariff are you currently on?
F1
Fixed — ends within 6 months
F2
Fixed — more than 6 months left
V
Variable / default tariff
Price cap rate
?
Not sure
Question 5 of 5 — about you
Which best describes you?
How do you primarily think about this property?
HO
Homeowner
Primary residence
LL
Private landlord
I rent properties as investments
PD
Property developer
BO
Business owner / director
—
Other
Almost done — optional
Optional — mobile number
Want updates by text or phone too?
Completely optional. If you add your number we can reach you when grants change or new schemes launch.
🇬🇧 +44
Complete
✓
You're in.
Check your inbox.
Your personalised results are on their way. Watts Happening lands every Tuesday at 7am.

The independent UK energy newsletter for homeowners and business owners who think in payback periods — not green guilt. Facts, data, and straight opinion on solar, heat pumps, bills, and the grid. Free. Every Tuesday.

Results email arriving shortly · Check spam if needed
Unsubscribe from any email at any time