No. Without Allied help the USSR could at most hold the Germans out of Moscow. But they couldn't defeat the Wehrmacht without any external help. In fact, large proportions of the raw material resources used by the USSR were supplied by the Allies (
http://www.sturmvogel.orbat.com/SovLendLease.html). For instance, 55% of the aluminium used in the USSR was supplied by the Allies.
There is also this quote of mine which compares the British and Soviet economies:
Guaporense wrote:Actually, even UK had greater material resources than the Soviet Union. Even though in 1942, the USSR produced much more ground related equipment, such as tanks and guns, the actual war related production of the UK surpassed those of the USSR. The difference was that the quality of British equipment was higher and also that the USSR managed to produce equipment at a smaller cost and focused on low cost equipment, such as small arms, tanks and guns. But ammunition, aircraft and naval production were the focus of the British war production effort.
In 1942, this was the respective relation of resources between UK and the USSR:
--------------------------------------------------- UK ------- USSR ----- USSR/UK ratio
GDP (billions 1939 dollars) ------------------- 33.81 ---- 17.57 ---- 0.52
Military outlays (billions 1939 dollars) ------ 18.26 ---- 10.68 ---- 0.59
Energy supply (MT of coal equivalent)* ----- 208.2 ----- 94.55 --- 0.46
Steel (thousands of metric tons) ------------ 12,968 --- 8,070 ---- 0.62
Iron (thousands of metric tons) ------------- 7,726 ----- 4,779 ---- 0.62
Electricity (thousands of KW/hour) --------- 36,903 ---- 29,068 --- 0.79
*derived from Coal, Lignite, Oil production converted at 29 MJ = Coal, 15 MJ = Lignite, 42 MJ = Oil. I don't have oil imports for the UK in 1942, but considering oil reserves were 5.2 million tons they cannot have been greater than 10-15 million tons, so over 90% of UK's energy supply came from coal mined domestically.
It appears that the USSR had around 50-60% of the resources of UK in 1942. Energy supply was less than half, and that without counting the oil imports of the UK, only domestic coal production. The difference was only less than 60% in the case of electricity, but that reflected the fact that the USSR had developed a younger industry than the UK and hence used more electricity in proportion to it's size (another example is Italy, whose electricity supply was 19.6 billion KW/hour, more than half UK's supply and it's GDP was 1/4 of the size).
Note, in the critical years of 1942-1943, even the British economy alone was greater than the Soviet economy. It was roughly twice the size, by measuring the consumption of energy and GDP. Germany had much greater resources:
--------------------------------------------------- Germany ---- UK ------- USSR ----- USSR/UK ratio ---- USSR/Germany ratio
GDP (billions 1939 dollars) ---------------------- 54.40 ----- 33.81 ---- 17.57 ---- 0.52 ---------------- 0.32
Military outlays (billions 1939 dollars) --------- 36.42 ----- 18.26 ---- 10.68 ---- 0.59 ---------------- 0.29
Energy supply (MT of coal equivalent)* ------- 404.84 ---- 208.2 ----- 94.55 --- 0.46 ---------------- 0.23
Steel (thousands of metric tons) -------------- 28,700 ---- 12,968 --- 8,070 ---- 0.62 ---------------- 0.28
Iron (thousands of metric tons) --------------- 22,200 ----- 7,726 ----- 4,779 --- 0.62 ---------------- 0.22
Electricity (thousands of KW/hour) ------------------------ 36,903 ---- 29,068 --- 0.79
* In 1942, Germany produced 264.5 million tons of coal, 248.9 million tons of lignite and consumed 8 million tons of oil. Equivalent in terms of energy to 404.84 million tons of coal, over 4 times Soviet energy resources.
I don't have data on electricity but some sources indirectly suggests a level of consumption around 75 billion KW/hours in Germany. Much larger than British and Soviet levels.
Overall, the USSR lacked the economic resources to defeat Germany alone. In fact, 85-90% of the economic resources available to the Allies were in the hands of UK and the USA.
"In tactics, as in strategy, superiority in numbers is the most common element of victory." - Carl von Clausewitz