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Hello SimonK, You can get a single kWh reading that covers any period with cumulative kWh feeds by making two api requests - its a bit complicated but very possible. One for the latest value with /feed/value.json?id=FEEDID and another using the data request api for example to get the value at the start of today (1st of april):

/feed/data.json?id=FEEDID&start=1459465200000&end=1459465201000&interval=1

the timestamps need to be in milliseconds and the end time 1s after the start time with interval set to 1.

myelectric does this internally for last week, month, year totals here: https://github.com/emoncms/app/blob/9.0/myelectric/myelectric.js#L425

A little bit more by way of example, using data from home:

https://emoncms.org/feed/data.json?id=116693&start=1459465200000&end=145...
returns: [[1459465200000,152.37690734863],[1459465210000,152.37690734863]]
the first value is the value that matches the request timestamp we want.
 

https://emoncms.org/feed/value.json?id=116693
returns: "154.33682027241"

154.33682027241 - 152.37690734863 = 1.96 kWh today (solar not very sunny)

Thank you!

This is what I get for the last day (not today) ie. for yesterday.

{"success":false,"message":"request datapoint limit reached (3000), increase request interval or time range, requested datapoints = 82799"}
 

It looks like I have too many data points (every 10s)

I think your start and end timestamps are too far apart. They need to be 1 second apart:

https://emoncms.org/feed/data.json?id=116693&start=1459465200000&end=1459465201000&interval=1

Timestamps in milliseconds:

1459465200000
1459465201000 (1 second difference)