As much as any large scale energy project.
Per kW it is quite effective.
The implication of GP's reasoning is that were Green not yelling about nuclear these would already be built because the projects would have started long ago.
>> where would you store nuclear waste (bonus points for: in your region)
People don't want solar farms, windmills, or oil rigs in their backyard either. Fun fact, coal emits orders of magnitude more toxic waste (including nuclear!) than nuclear itself; it's just stored in the atmosphere.
Also people largely don't want to cook themselves to death because the atmosphere has turned into a literal oven.
Instead they read the news, yap "oh my god 50degC shadowside that is horrible", turn the newspaper page and Gell-Mann-amnesia-forget about it because it's happening at the other side of the world, comfortably sitting on their couch with their HVAC pumping heat outside further contributing to the problem.
>> contributes little to global energy mix atm
Catch-22. Because there's not enough nuclear reactors.
France has a ~ 70% nuclear 10% renewable 10% fossil 10% hydro mix.
> France generates roughly two-thirds of its electricity from nuclear power, well above the global average of just under 10%. This heavy reliance on nuclear energy allows France to have one of the lowest carbon dioxide emissions per unit of electricity in the world at 85 grams of CO2 per kilowatt-hour, compared to the global average of 438 grams
https://en.wikipedia.org/wiki/Nuclear_power_in_France
>> uranium is limited.
Uranium is aplenty.
> more than antimony, tin, cadmium, mercury, or silver [~40x!], and it is about as abundant as arsenic or molybdenum.
https://en.wikipedia.org/wiki/Uranium#Occurrence
The problem is enrichment, and it is not even a technical problem. We're doing more difficult things producing nanometer scale compute wafers by the millions.
Nuclear has drawbacks. I don't think it is the endgame. I'm still waiting for anyone to come up with a less bad solution that actually a) addresses nuclear drawbacks and b) works, because all I see is yelling at nuclear and the proposed alternatives are either unobtainium or nothing at all, both equivalent to the status quo that turns the planet into a death trap.