I don't understand the claimed causal relationship.
FWIW, I'm paying rent for my current apartment, we don't have a gas supply, and I've never had a power cut.
Indeed, while I am rich and do own an apartment back in the UK, roughly three quarters of the 16.5 years since I've last experienced a power cut was in property I pay rent for, and only about 4 years were in the flat I own and began collecting rent on when I left the country. Which, ah, also doesn't have a gas supply.
In any case, not sure what this is suppressed to have to do with reliably of the electricity supply — it's not like landlords get free shares in local power grid companies (or if we do, I missed the memo).
Sorry but this is nonsense. Your local power utility monopoly is what it is, completely unrelated to whether you rent or own.
Might be different in the UK.
I have never lived anywhere where blackouts weren't fairly regular. Currently in the backwaters of silicon valley and blackouts are the norm every time it rains, or there's any wind. Or forecast of wind or fear of rain. Thanks PG&E.
So while I fully believe your lived experiences and preferences, a relevant question is: why are your electricity supplies so unreliable that having gas as well is even an important concern?